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1. Tools Help StartTaz EndTaz Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query 181 1 7 89427039056779 9640 30 851479 22 158 1 2 15466224982879 _ 3260 26 29194 Query Options 23 68 4 2 85676831402093 209 0 57 079905 55 101 n 2 49853956603812 4050 3248414 Select Trip File 92 97 4 6 5155352066497 1091 0 25 785334 te 93 94 n 1 02599033268935 1840 22 86482 User Defined 95 102 n 3 0010574426297 692 0 20 472836 95 190 1 1 47566843472736 1520 36 838196 Agoregate B 36 103 1 2 54285658382615 4390 24 32755 ggreg 98 95 1 1 34522266642205 2820 1871975 By starting Taz 99 83 4 6 48132445208864 5820 41 26021 99 103 h 3 00312895943983 6190 23 711596 Y By ending Taz 100 188 1 4 33139156349605 461 0 35 43866 zs 101 99 1 4 14610943618653 551 0 31 989567 By startActivity 103 100 1 2 84179540749557 849 0 2254616 O endActivity 103 136 3 76362013556552 647 0 23 531378 103 190 n 3 80567088470827 4490 34 108353 108 103 n 2 9335117658703 620 0 19 631927 125 109 0 1 7647074305303 289 0 23 292028 User Defined Pre Defined 137 99 1 8 12792951450828 10260 31 490839 148 20 h 1 2889983323754 180 0 22 323421 Select B Value 148 163 h 2 02095508961095 389 0 125 10956 Y 158 125 n 1 98678004453849 3340 22 832144 160 148 4 1 03909389977696 2320 21 583479 By starti 162 147 1 1 72363733339083 2250 30 976469
2. StartTaz EndTaz Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query 61 95 1 4 80286888811832 5550 4 67584 99 54 1 6 81996813315727 951 0 37 340816 Query Options 102 95 1 2 57693324616565 471 0 22 052256 112 103 1 1 57984880184946 187 0 31 078993 112 106 h 1 31855864011841 69 0 23 9123 User Defined Aggregate By v By starting Taz v By ending Taz CO By startActivity O By endActivity User Defined Pre Defined Home Based Work O Home Based Other O Non Home Based SU Userm Y untitle L f A T 8 44AM Gmail The reader will note that there is 1 home based work trip between zones 99 and 54 The average trip length for this trip is 6 82 miles the average trip duration is 951 seconds and the average trip speed is 37 miles per hour 46 GPS TDG v1 0 User s Manual Appendix A Contents of the ModelParameters csv file the default specification for activity type classification estimated using data from Laredo RecordType Activity_Type Industrial_or_warehouse Institutional Retail office_space LDR MDR_or_HDR No_land_use Trip_duratio n Activity_duration 7_AM_9_AM 9_AM_2_PM 2_PM_6_PM after_6_PM Trip_origin_is_home Trip_origin_is_work Employed Stu dent Male Number of children in HH Constant MREC Work related 1 5104 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4378 0 0 0 0 0 0 0 0 0 0 3 0294 0 0 0 0 0 0 0 MREC Sch001 0
3. 10049871 10049872 10 9 180 148 20 Unzoned RETAIL OFFI Serve_ Select Relati Laredo link 40049871 10049872 1 10 209 23 68 Unzoned Serve 10049871 10049872 14 11 360 173 177 Unzoned RETAIL OFFI Eat ou _Serestoup LaredoE 10058081 10058081 3 1 285 159 124 Unzoned Unzoned Home Select LUTrimmed 40058081 0058081 2 528 137 178 Unzoned Unzoned Serve en 10058081 10058081 8 3 405 177 159 Unzoned Unzoned Serve_ Select Mode ModelParam 10058081 10058081 9 4 168 159 137 Unzoned Unzoned Serve_ 10058081 10058081 13 5 281 148 28 Unzoned Unzoned Serve_ 10058081 10058081 17 6 326 22 158 Unzoned Unzoned Serve_ 10058081 10058081 19 7 334 159 125 LDR Unzoned Persor 10058081 10058081 20 8 288 125 109 Unzoned RETAIL OFFI Serve_ 10058081 10058081 21 E 620 109 103 RETAIL OFFI RETAIL OFFI Other_ 10058081 10058081 22 10 647 103 136 RETAIL OFFI Unzoned Grocer 10091221 10091221 1 1 479 134 124 MDR Unzoned Home 10091221 10091221 2 2 122 125 195 RETAIL OFFI Unzoned School 10091221 10091221 3 3 491 134 124 Unzoned Unzoned Serve_ 10091221 10091221 4 4 394 126 134 Unzoned MDR Work_ 10016171 10016171 1 1 471 102 95 Unzoned INSTITUTION Home 10016171 10016171 2 2 692 95 102 INSTITUTION LDR Work 10029442 10029442 1 1 531 94 189 LDR RETAIL OFFI Home 10029442 10029442 2 2 298 h 89 99 RETAIL OFFI RETAIL OFFI School A 10029442 10029442 2 3 582 99 93 RETAIL OFFI RETAIL OFFI Serve_ Optio
4. Preprocess GPRMC Preprocess GEO Query Other work Query Options Select trip File TripFile guitest7 1 csv User Defined This opens the Select Source Directory window which allows the user to specify the directory containing the raw GPS files This input directory should contain one file per vehicle Files containing the GPS streams in the GeoLogger format should have a dlv extension Files containing the GPS streams in the GPRMC format should have a gprmc extension The detailed structures of these input files are presented in Section 4 1 1 The user can navigate to the directory containing the raw GPS streams and click the Select Source Directory button to select the files LT x Look in En Laredo y 2 oaa Fe GPsclean My Recent Documents Desktop 3 My Documents BE My Computer e File name C Valid Laredo GPS Select Source Directory Fies of type Al Fies v Cancel 12 GPS TDG v1 0 User s Manual Once the Source Directory is selected C Valid Laredo GPS as above the Select Target Directory window opens and the user is prompted to select the sub directory in which the pre processed GPS files will be stored Again the user can navigate and select the desired output directory by clicking Select Target Directory C Valid Laredo GPSClean as below As Look in Laredo 3 My Recent Documents Desktop My Documents er My Co
5. The displayed items are listed and briefly described below The analyst can view all the attributes generated by opening the csv output file described in detail in Section 4 3 2 in standard spreadsheet packages like MS Excel 24 GPS TDG v1 0 User s Manual Column Col Name Description 1 VehlD Identifier for GPS equipped vehicle HHVehlD in the corresponding trp file 2 DriverID Identifier for the primary driver of the equipped vehicle 3 OriginalTripNo Trip number assigned originally to all potential trips 4 TripNo Final trip number assigned 5 TripDuration Trip duration in seconds 6 StartTAZ TAZ identifier for the trip start location T EndTAZ TAZ identifier for the trip end location 8 StartLU Land use at the trip start location 9 EndLU Land use at the trip end location 10 StartActivity Activity type pursued by the driver of the vehicle at the origin of the trip 11 EndActivity Activity type pursued by the driver of the vehicle at the destination of the trip 12 StartDate Date and time of the start of the trip 13 EndDate Date and time of the end of the trip 14 TripLength Trip length in miles 15 TripSpeed Average trip speed in miles per hour 3 3 2 Query Results Display The data elements displayed for query outputs are the number of trips average trip length miles average trip duration seconds and average trip speed miles per hour The number of rows of d
6. VehID UTC_Date UTC_Time Loc_Date Loc_Time Lat_Raw Long_Raw Elev_Raw Speed Heading HDOP SATS RecType takes the value 5 indicating a GPS record GPSID is the identifier for the GPS device used HHID is the identifier for the household VehlD is the identifier for the GPS equipped vehicles in a household UTC_Date is the UTD date in the MM DD YY format UTC_Time is the UTC military time in the HH MM SS format ON arate Mr E 27 GPS TDG v1 0 User s Manual 7 Loc_Date is the local date in the MM DD YY format 11 Loc_Time is the local military time in the HH MM SS format Lat_Raw is the instantaneous latitude position recording in decimal degrees 10 Long Raw is the instantaneous longitude position recording in decimal degrees Elev Raw is the instantaneous elevation in meters 25 13 14 15 Speed is the instantaneous speed recoding in meters per second 0 to 514 m s Heading is the direction of movement in degrees 0 to 359 9 degrees HDOP is the horizontal dilution of precision 0 5 to 99 9 SATS is the number of satellites in view 0 to 12 The GPRMC Sentence Format Example GPRMC 040113 A 3653 10 5 17437 47 E 000 6 074 4 190903 03 Generic Structure GPRMC Time Status Latitude Lat_Hem Longitude Long_Hem Speed Heading Date Blank CheckSum 1 2 3 4 5 6 GPRMC is a record type identifier Time is the UTC time in HHMMSS SSS format Status f
7. ml 1 Work Threshold Maximum distance from work of a trip end point to be considered Work miles w 0 5 Home Threshold Maximum distance from home of a trip end point to be considered Home miles h 0 3 Minimum Interval Minimum time difference between records to be used for distance computation secs i 1 Speed Threshold Minimum speed of a record to be used for distance computation m sec s 0 5 Speed Threshold2 Minimum speed of a record to be used for detecting NEPO stops m sec s2 0 1 Minimum work duration secs d 3600 Update Time Time between GPS records secs u 1 49
8. 0 0 7022 0 0 0 0 0 0 0 0 0 0 0 00 0051 1 1321 0 0 0 0 0 0 0 977 0 0 0 0 3 265 0 0 0 0 1 4004 MREC Grocery_shopping 0 0 0 0 1 9651 0 0 0 0 1 2656 0 0 0 00 0165 0 0 0 501 0 0 0 6922 0 0 0 0 0 0 0 0 0 0 0 0 3 9153 MREC Other_shopping 0 0 0 0 2 0343 0 0 0 0 0 0 0 0 0 00 0115 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 7517 MREC Personal_services 0 0 0 0 0 3002 0 0 0 0 0 0 0 0 0 00 0123 0 0 0 7788 0 4191 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 0575 MREC Social 0 0 0 0 0 0 1 4129 1 1106 0 0 0 0 0 00 0083 0 0 0 0 0 0 0 9557 0 0 0 0 0 0 0 0 0 0 0 0 4 4005 MREC Eat_out 0 0 0 0 0 8477 0 0 0 0 0 0 0 00 0157 0 00 0129 0 0 1 2642 0 0 1 1763 0 0 1 2323 0 0 0 0 0 2752 0 0 4 0095 MREC Serve_passenger_at_school 0 0 1 8989 0 0 1 7472 1 9238 0 9117 0 0 0 00 0294 2 6581 0 0 1 6574 0 0 0 8614 0 0 0 0 0 0 0 00 3425 0 4816 3 3162 MREC Serve_passenger_at_other location 0 0 0 0 0 0 0 9835 0 0 0 0 0 0 0 00 0384 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1509 5 8298 47 GPS TDG v1 0 User s Manual 48 GPS TDG v1 0 User s Manual Appendix B Contents of the GPSTDG options file with the default flags and parameter values DebugFlag debug nodebug nodebug EnhancedFlag enhanced standard standard DwellTime Minimum time to detect an engine power off stop in secs t 30 NEPO DwellTime Minimum time to detect a non engine power off stop in secs t2 60 Non Engine Power Off Flag nepo nonepo nepo Minimum Trip Duration in seconds mt 120 Minimum Trip Length in miles
9. 1 the pre processed GPS navigational stream files and 2 the derived trips in the travel diary format Each of these are discussed below 4 3 1 Pre Processed GPS Streams The pre processed GPS streams are generated by the pre processor and serve as subsequent inputs to the main trip detection component of the GPS TDG software These files are written out in the comma separated format with a cln extension There is one file corresponding to each vehicle in the survey The structure of each row of data for these files is discussed below Example GREC 273 1005361 1 1017058405000 27 52020 99 46402 0 00 000 1 Generic Structure GREC GPSID HHID VehID Time Latitude Longitude Speed Heading NumInvRecs 1 GREC is a record type identifier indicating that this is a record in a cleaned GPS stream file GPSID is the identifier for the GPS device used HHID is the identifier for the household VehlD is the identifier for the GPS equipped vehicles in a household Time is the instantiations time in milliseconds from 1970 corrected for DST Latitude is the instantaneous latitude position recording in decimal degrees Longitude is the instantaneous longitude position recording in decimal degrees Speed is the instantaneous speed recoding in meters per second 0 to 514 m s ION a coa Heading is the direction of movement in degrees 0 to 359 9 degrees NumInvRecs is number of invalid records immedi
10. 8 28 6600802 The figure below is the output displayed when the subset of non home based trips from the same trip file as shown in Section 3 3 1 is aggregated by trip end activity type GPS Travel Diary Tools Help EndActivity Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query Eat out 3 1 5807653106217 263 0 24 690667 Grocery shopping 8 3 16534419003562 497 25 26 65397225 Query Options Other shopping 1 2 49853956603812 405 0 32 48414 Personal_services 4 2 7564874346786 517 75 26 71841575 Select Trip File School B 3 74997726453892 500 25 32 252524625 Emm E Serve passenger at other 11 2 65477376985119 425727272727273 258219570909091 User Defined Serve_passenger_at_school 14 3 12069270561932 466 214285714286 28 4752792142857 Social 4 7 71681221225867 910 5 33 1788515 Work 4 2 71320008792123 383 25 31 545528 Aggregate By Work related 5 35846686566881 677 8 28 6600802 By starting Taz By ending Taz By startActivity Y By endActivity User Defined Pre Defined O Home Based Work O Home Based Other O Non Home Based lt u a Gmail http ca UserM untitle 26 GPS TDG v1 0 User s Manual 4 Inputs and Outputs This chapter of the manual describes the various inputs provided to GPSTDG and the structure of the output f
11. Clicking the Select Model Parameters File button opens the Select Model Parameters window The user can navigate to select the empirical specification file for the disaggregate activity type classification model and click the Select Model Parameters button to select the file This is comma separated file containing the disaggregate activity types into which the other activities are to be classified and the parameters of a multinomial logit model which will be used by the algorithm to determine the activity purpose probabilistically Detailed specifications of this file are discussed in Section 4 2 1 Ideally the analyst should estimate this model using local data from the study region and provide the parameters as inputs However if such an exercise cannot be undertaken the default parameters provided with the software C GPSTDG ModelParameters csv may be used These defaults are also presented in Section 4 2 1 The detailed procedure for estimating these model parameters have been presented in Research Report 2 Select Model Parameters xj Lock in erstos 2 oma My Recent Documents E Desktop E ModelParameters csv My Documents My Computer amp File name ModelParameters csv Select Model Parameters My Network Places Files of type Model Parameters file y Cancel 20 GPS TDG v1 0 User s Manual As in the case of the Basic Pane clicking the Detect Trips button runs the trip
12. INCLUDE C Program Files Microsoft Visual Studio LIB C Program Files Microsoft Visual Studio TEMP C Documents and Settings Prabuddha TMP C Documents and Settings Prabuddhai New Edit Delete System variables Variable Value ANTHOME ARCGISHOME 1 Developerkititools ant ARCENGINEHOME C Program Files ARCGIS ARCGIS LICENS 192 168 0 100 ComSpec CHWINDOWS system32 cmd exe FP NO HOST C NO zl New Delete OK Cancel If the variable CLASSPATH exists under User variables highlight this variable and click Edit The Edit User Variable window pops up To the variable value add the path to the GPSTDG software i e enter C GPSTDG at the beginning of the text already in this text box Click OK to save the changes If the CLASSPATH variable does not exist click the New button under User variables The New System Variable window pops up Enter CLASSPATH as the variable name and the path to where GPSTDG is installed as the variable value i e C GPSTDG Click OK to save the changes System Restore Automatic Updates Remote Environment Yariables Edit User Yariable 2 Yariable name CLASSPATH Yariable value C GPSTDGI C Program Files Altovaixmisp cn System variables The variable PATH exits under System variables Highlight this variable and click Edit The Edit User Variable window pops up In the variable val
13. an engine power off stop seconds 6 MinWorkDur is the parameter defining the minimum activity duration at a trip end for classifying a trip end activity as Work The very last record in the output file is a trailer record with the following format TREC TripCount VehCount where 1 TREC is a record type identifier indicating that this is a trailer record in the output file 2 TripCount is the total number of trips derived from GPS streams contained in the output file 3 VehCount is the total number of vehicles in the output file The rest of the output file is comprised of three types of records the vehicle header records the vehicle trailer records and the trip records The vehicle header and vehicle trailer records respectively are included immediately before and after the trip records corresponding to a particular vehicle and thus help to distinguish the trips of one vehicle from another The vehicle header record has the following format HHVehlD DriverID where 1 is a record type identifier indicating that this is a vehicle header record 2 HHVehID the identifier for the GPS equipped vehicles in a household This is created by appending the vehicle ID to the household ID 3 DriverID is the identifier for the primary driver in the household associated with the vehicle HHVehID This is created by appending the Person ID to the Household ID The trailer record has the following forma
14. area and 2 Parcel level land use The specifications of these files have been discussed in Sections 4 1 3 and 4 1 4 respectively In addition to the above input data items the default input parameters are also provided as files These are the GPSTDG options file containing the algorithm parameters and the ModelParameters csv file containing the MNL model specification Both these files are available in the C GPSTDG folder The outputs corresponding to the above described sample data are also provided with the software 1 The pre processed GPS streams files are provided in the folder C GPSTDG Laredo GPSClean There is one processed GPS file with a cln extension corresponding to every input file and these files have a structure as described in Section 4 3 1 39 GPS TDG v1 0 User s Manual 2 The derived trip diaries are provided in the C GPSTDG Trips folder The structures of these two files have been described in Section 4 3 2 5 2 PREPROCESSING GPS STREAMS The raw GPS streams can be preprocessed for subsequent input to the software in the following way 1 Create a folder called GPSClean in folder C GPSTDG Laredo 2 Double click on the GPSTDG bat file to run the GPS TDG software 3 Click on Tools in the Menu Bar and select Preprocess GEO from the drop down list 4 The Select Source Directory window pops Navigate to C GPSTDG Laredo GPS and click the Select Source Directory button 5 The Select Target Directo
15. as well as to serve as the foundation for regional travel demand models Technology advancements have resulted in changes in household travel survey data collection procedures the most recent being the introduction of Global Positioning Systems GPS to record travel patterns The GPS technology shows promise to minimize costs while maximizing the volume of travel data collected However the data recorded by GPS devices do not directly yield travel information rather the outputs from these devices are in the form of navigational streams that have to be processed to derive travel information Therefore the success of this new technology as a travel survey instrument depends on the ability of the analyst to derive meaningful trip information from the navigational data streams of GPS devices Research project 0 5176 funded by TxDOT focused on the development of a prototype software tool labeled the GPS Based Travel Diary Generator GPS TDG that automates the process of converting navigational data streams collected passively from in vehicle GPS devices into an electronic travel diary This derived travel diary comprises a sequence of vehicle trips identified from the GPS streams with each trip characterized in terms of attributes such as trip end location trip purpose or activity type at destination time of day duration distance and speed The software has been developed in the Java programming language using ArcGIS 9 0 as the platform
16. detection and characterization algorithm implemented within the software A Progress Bar pops up which displays the name of the file containing the preprocessed GPS streams of the vehicle currently being processed and the percentage of all vehicles that have been processed On completion of the run the and csv output files as discussed above are generated and the csv file is loaded automatically into the data area The structure of this spreadsheet is discussed in Section 3 3 Select GPS File Directory GPSClean Select TAZ File LaredoTaz shp Select Demographics LaredoTest demo Select Relation File LaredoTest link Select Output File testi Select LandUse File LUTrimmed shp Select Model Paramet ModelParameters csv e progress 5 i Detecting Trips Enhanced Mode J Processing 032502_100540 BEHHNI 3 2 3 The Query Pane The Query Pane allows the user to aggregate and analyze the derived trip file in many ways First by clicking on the Select Trip File button the user selects a trip file in the csv format which has been created using the GPS TDG software i e a file that was generated by clicking Detect Trips in either the Basic or Enhanced Pane The name of the chosen file is displayed adjacent to the button The trips in this file can then be aggregated either by trip end locations and or
17. mode and view the derived trip file This pane has all the elements of the basic pane and two additional buttons to specify the additional inputs required for the enhanced analysis The two additional buttons are discussed further here As in the case of the Basic Pane the chosen folders and files containing the input data are also displayed adjacent to the corresponding buttons in the Enhanced Pane 18 GPS TDG v1 0 User s Manual Basic Enhanced Query i GPS File Directory Select TAZ File file Select Demographics DemoGraphics file Select Relation File Relationship file Select Output File Output file Select LandUse File LandUse file Select Model Paramet Model Parameters file Options Detect Trips Clicking the Select LandUse File button opens the Select LandUse window The user can navigate to the GIS file containing the land use of the study area Click the Select LandUse button to select the file This GIS file is provided in the ESRI shape file format with a shp extension Detailed specifications of this file are discussed in Section 4 1 4 19 GPS TDG v1 0 User s Manual Select LandUse x Look in a SpatialData y it cra c LaredoTaz shp Fe My Recent Documents e Desktop My Documents er e My Computer File name LUTrimmed shp Select LandUse My Network 5 Places Files of type ArcGis files v
18. single vehicle trip Although the software generates several attributes for each trip See section 4 3 2 for the complete details only the most important and commonly used characteristics are displayed in the Data Area GPS Travel Diary Tools Help Vehld Driverld OriginalTripNo TripNo TripDuration StartTaz EndTaz Start LU End LU StartActivity EndActivity StariDate Basic 10049871 10049872 1 177 Unzoned Unzoned Home Serve pass los 70215 A e 10049871 10049872 2 2 147 175 162 LDR Unzoned Serve pass Serve_pass 10511 70216 _ Query _ 10049871 10049872 3 158 162 159 Unzoned Unzoned Serve pass at out 05 17 02 16 Enhanced toossez1 honaser2 l 4 232 160 148 Unzoned RETAILIOFFI Eat out Grocery sh 05 17 02 16 10049871 110049872 6 5 389 148 163 Unzoned Unzoned Grocery sh Work related 05 17 02 16 10049871 110049872 7 B 376 163 177 Unzoned Unzoned Mork related Serve pass zm 7102 16 10049871 10049872 8 7 283 177 173 Unzoned LDR Serve pass Social losa 702 17 10049871 10049872 9 8 225 162 147 Unzoned Unzoned Social Personal se 05 17 02 17 10049871 10049872 10 9 180 148 20 Unzoned RETAIL OFFI Personal se Work related 05 1702 17 10049871 10049872 11 10 209 23 68 Unzoned Work related School 0517 0
19. the trips from pre processed GPS streams Further the trip detection can be performed at two levels of sophistication the basic and the enhanced modes In the basic mode the trip end activity types are classified into home work and other In the enhanced mode activity purposes classified in the basic mode as other are in turn classified into finer categories such as grocery shopping other shopping and social In addition to the trip file generation the Command Area also provides the user with tools to query the derived trip file in many ways The Command Area is organized into three panes 1 The Basic Pane 2 The Enhanced Pane and 3 The Query Pane Each of these is discussed below 3 2 1 The Basic Pane The Basic Pane of the Command Area allows the user to specify inputs run the trip detection in the basic mode and view the derived trip file The Basic Pane comprises several buttons to specify the input data files a text box to specify optional parameters to control the trip detection algorithm and a button to run the trip detection algorithm and view the generated trip file The chosen folders and files containing the input data are also displayed adjacent to the corresponding buttons in the Basic Pane for example the figure below indicates that LaredoTaz shp is the input TAZ file Each of the buttons and the Options text box is discussed further below 14 GPS TDG v1 0 User s Ma
20. 109 103 1 2 9335117658703 620 0 19 631927 112 103 1 1 57984880184946 187 0 31 078983 112 106 1 1 31855864011841 680 23 9123 123 117 1 2 08609978628254 4920 16 796875 125 109 1 1 7647074305303 289 0 23 292028 3 ex amp GPST il UserM untitle For example the reader will note that there are 3 trips between zones 95 and 190 The average trip length for these trips is 2 04 miles the average trip duration is 286 seconds and the average trip speed is 33 miles per hour Trip table and inter zonal performance measures by time of day The previous analysis determined the trip tables and highway performance measures over the entire day To determine the same measures but for a specific time period of the day say the PM peak of 3 30 PM to 6 30 PM first check the By start time box and enter the value i e 15 30 in the editable list adjacent to the check box Next check the By end time box and enter the value i e 18 30 in the editable list adjacent to the check box Next check the By Starting TAZ and By ending TAZ boxes under the Aggregate By section of the Query Pane and click the Execute Query button The output comprises one row of data for each zonal pair represented in the data as shown below 44 GPS TDG v1 0 User s Manual GPS Travel Diary
21. 162 159 1 1 04823639387498 158 0 28 689823 endin 163 177 1 2 782960288199 376 0 28 239477 172 177 n 218764049181363 3550 25 267542 By startT 15 30 v 175 162 0 1 0064195683271 147 0 33 587288 Ss 177 173 h 1 8487387390286 283 0 28 98819 endTi 18 30 v 181 0 7 08046910360363 771 0 33 92692 Le 188 99 0 1 67142610565273 298 0 27 911114 By startA 5 cA CAWI GPST untitle The reader will note that there is 1 trip between zones 96 and 103 that originates after 3 30 PM and ends before 6 30 PM The average trip length for this trip is 2 54 miles the average trip duration is 439 seconds and the average trip speed is 24 miles per hour Trip table and inter zonal performance measures by trip purpose The second analysis determined the trip tables and highway performance measures over all trip purposes To determine the same measures but for a specific trip purpose say the home based work first click on the Pre defined tab in the Select By area of the Query pane and check the box marked Home Based Work Next check the By Starting TAZ and By ending TAZ boxes under the Aggregate By section of the Query Pane and click the Execute Query button The output comprises one row of data for each zonal pair represented in the data as shown below 45 GPS TDG v1 0 User s Manual GPS Travel Diary Tools Help
22. 2 17 10049871 10049872 14 11 360 173 177 Unzoned RETAIL OFFI School Est_out los 7 02 22 10058081 10058081 3 1 285 158 124 Unzoned Unzoned Home Serve pass 03 25 02 OT 10058081 10058081 6 2 526 137 178 Unzoned Unzoned Serve pass Serve_pass 03 25 02 07 10058081 10058081 8 i3 405 177 159 lUnzoned Unzoned Serve_pass Serve_pass 03 25 02 Ala 10058081 10058081 3 14 168 159 137 Unzoned Unzoned Serve pass Serve_pass 03 25 02 14 10058081 10058081 13 5 281 148 28 Unzoned Unzoned Serve pass Grocery sh 03 2502 44 10058081 110058081 17 B 326 22 158 Unzoned Unzoned Grocery sh Serve pass 03 25 02 15 10058081 10058081 19 Ir 334 158 125 LDR Unzoned Serve pass Serve pass 103 2502 16 10058081 10058081 20 8 288 125 108 Unzoned RETAIL OFFI Serve pass Serve_pass 03 2502 16 10058081 10058081 21 8 620 109 103 RETAILIOFFI RETAIL OFFI Serve_pass Serve pass 03 25 02 16 10058081 10058081 22 10 647 103 136 IRETAIL OFFI Unzoned Serve pass Serve_pass 032502 16 10091221 10091221 1 1 479 134 124 MOR Unzoned Home Personal se 04 08 02 10 10091221 10091221 2 2 122 125 195 RETAILIOFFI Unzoned Personal se Grocery sh 040802 1432 10091221 10091221 3 491 134 124 Unzoned Unzoned Grocery_sh School 04 08 02 12 10091221 10091221 4 n 394 126 134 Unzoned MDR School Home 04 08 02 14 10016171 10016171 1 1 471 102 95
23. 26 03924 68 181 4 10 3731091005627 11970 34 154705 Aggregate By 92 97 1 6 5155352066497 1091 0 5 785334 93 61 1 4 95313494859039 5820 32 416042 By starting Taz 93 94 2 1 39560107152198 2275 23 4550635 Eee 93 95 1 3 0371175575096 679 0 23 538986 33 97 1 2 7196143490956 419 0 26 075714 By startActivity 93 190 1 2 04379746803984 4020 24 53446 94 93 1 1 74000207679819 2020 8 611193 O endActivity 94 189 1 4 63839652715252 5310 41 01365 95 92 1 3 90873433707156 756 0 25 832924 95 102 1 3 0010574426297 692 0 20 472836 35 190 3 2 04892349834196 286 0 32 9286606666667 User Defined Pre Defined o6 103 1 2 54285658382615 4390 4 32755 96 112 1 1 60901651331656 570 29 974678 Select By Value 97 61 1 2 56149307316689 3420 30 954605 38 95 1 1 34522266642205 282 0 1871976 99 54 1 6 81996813315727 8510 37 340816 L1 By starti o9 83 1 6 48132445208864 582 0 26021 99 103 4 3 00312895943983 519 0 23 711596 endin 100 188 1 433139156349605 4610 35 43866 re 101 99 1 4 14610943618653 5510 31 889567 startT 102 95 1 2 57693324616565 4710 22 052256 102 190 1 5 32086838517548 739 0 31 199999 O By endTi 07 01 103 95 4 2 66701559341714 4280 27 576942 103 100 4 2 84179540749557 8490 122 54616 O By start 103 136 1 3 76362013556552 647 0 23 631378 u 103 190 1 3 80567088470827 449 0 34 108353 O By endA 106 112 1 1 30034608243147 300 0 27 570625 Ee
24. GPS TDG User s Manual Table of Contents 1 INTRODUCTION ser 1 2 SYSTEM REQUIREMENTS AND INSTALLATION INSTRUCTIONS 3 2 1 MINIMUM SYSTEM REQUIREMENTS essetis 3 2 2 INSTALLATION A EIU RR CT e Ii UR Ue e a en d gles 3 2 2 1 The Self Extractable File eee na eese eee ette cone nete teeth conose neenon 3 2 2 2 Defining Environment Variables eese eee eee nennen entente 4 2 2 3 Creating the DSN Data Source enne 7 3 THE GPS TDG ENVIRONMENT eere ee eese n eene e toot te ettet teste seta seta seta setas sense eaae 11 S T THE MENU BAR aee tien skin ter et s eer RA h 12 3 E The Tools Merian ten cineri tite teen vedete Ree 12 3 1 2 The Help Menit ausit eren ex ee neun 14 3 2 THE COMMAND AREA eie Hv es eer t o REIR 14 3 24 The Basic Pane aae tl 14 3 2 2 The Enhanced Pane s ee RE ee ur sane TES EAE Regis 18 3 2 3 The Query Pane uice d ed eee e B ERE OR San ann EET ita 21 3 3 THE DATAVARENX eicere eer eee RD de ee Ee Heres a eee ve e ehe 24 9 9 LALA DISPLAY rase iet iet p E 24 3 3 2 Query Results en 25 4 INPUTS AND OUTPUTS eerte innert nennen nen ere ene 27 4 1 DATAINPUTS 5i neret 27 4 1 1 Raw GPS Navigatio
25. Unzoned INSTITUTION Home Work 04 08 02 07 10016171 10018171 2 2 692 95 102 INSTITUTION LDR Work Home 104408102 LLA 10029442 10029442 1 1 531 94 189 LDR RETAIL OFFI Home School 04 17 02 O6 10029442 110029442 2 2 298 189 99 RETAIL OFFI RETAIL OFFI School Grocery sh 04 17 02 15 10029442 10029442 2 El 582 99 93 RETAIL OFFI RETAIL OFFI Grocery sh School loan 7102 15 10029442 10029442 2 4 184 93 94 IRETAIL OFFI Unzoned School Serve pass 10441 7 02 16 10056352 10056355 1 1 555 61 95 Unzoned INSTITUTION Home Work 03 25 02 06 10056352 10056355 2 2 756 95 92 INSTITUTION INSTITUTION Work Personal se 03 25 02 15 10056352 10056355 3 3 1091 92 97 INSTITUTION RETAIL OFFI Personal se Social 03 25 02 17 10056352 10056355 4 342 97 61 lUnzoned Unzoned Social Home 103 2502 18 10101431 10101431 1 1 679 93 95 IRETAIL OFFI Unzoned Home School 04 23 02 O7 10101431 10101431 2 2 294 95 190 Unzoned LDR School Work 04 23 02 08 10101431 10101431 4 3 412 95 190 RETAILIOFFI LDR Work Work 04 23 02 13 10101431 10101431 5 4 357 190 95 Unzoned INSTITUTION School Serve pass 042302 14 10101431 10101431 z 5 419 93 97 RETAIL OFFI Serve_pass Serve pass 0423 02 14 a a a ana lana na ana le n nn lar emo PT lr Gmail In http w E Gl UserMan
26. arameter Name Description Default Determines whether the software is run in the debug Flag Value s debug or mode debug or not nodebug The analyst will only Debug Flag nodebug run the software in the nodebug mode The debug option was developed for software testing purposes Determines whether the algorithm to determine non Non Engine Power off nepo or Flag one engine power off stops is executed nepo or not nepo nonepo Engine Power off t Minimum dwell time gap between successive valid GPS 30 secs Dwell Time Threshold records for signalling an engine power off stop seconds Minimum duration for which the speed should be less Non Preme Hower ort t2 than the Speed Threshold for signalling a non engine 60 secs Dwell Time Threshold ne 8 power off stop Speed Threshold for Value of instantaneous speed below which the vehicle is Non Engine power off 52 assumed to at rest used in determination of non 0 1 m s Stop Determination engine power off stops x ei for If the value of instantaneous speed is below this threshold Trip Distance s DM D 0 5 m s this GPS point is not used in distance computation Computation Time Threshold for Minimum time between pairs of GPS points for which the Trip Distance i distances are computed and summed to determine the trip 1 secs Computation length Maximum distance between trip end location and home Home Lo
27. ata depends upon the Aggregate By criteria employed If none of the Aggregate By boxes are checked we get one row of output For example the figure below represents the output displayed in the Data Area by querying the trip file indicated in the previous figure without any Select By or Aggregate By options chosen GPS Travel Diary Tools Help Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query p 8 54341601573994_ _1502 488095238095 128 9765344404762_ Query Options Select Trip File 29 GPS TDG v1 0 User s Manual The figure below is the output displayed when the trip file as shown in Section 3 3 1 is aggregated by trip end activity type Average Trip Length Average Trip Duration Average Trip Speed Est_out 3 1 5807653106217 263 0 24 690667 a Grocery_shopping 8 3 16534419003562 497 25 26 65397225 Home 7 2 49879209424674 419 714285714286 127 7753341428571 Other_shopping 1 2 49853956603812 405 0 32 48414 Personal_services 5 2 8371 2228282214 510 0 27 5844245 School 13 4 52116747441686 573 692307692308 33 3323086923077 Serve passenger at other 12 2 51730006166305 410 083333333333 25 5972218333333 Serve passenger at school 17 3 45958006378119 480 764705882353 28 8027478235294 Social 4 7 71681221225867 910 5 33 1788515 Work 9 3 10566422901045 440 666666666667 30 5824796666667 Work_related 5 5 35846686566881 677
28. ately prior to this GPS record that were removed during pre processing Each of the pre processed GPS streams file also contains a header record which provides the parameter values used in pre processing For example the header row of pre processed GPS file created from raw GeoLogger files could be HREC HDOP 5 0 Min Satellites 3 This indicates that GPS records with an HDOP value greater than 5 or number of satellites less than 3 were considered invalid and removed 34 GPS TDG v1 0 User s Manual In the case that the raw GPS streams have the GPRMC format the A V flag of the GPS sentences are used in pre processing Therefore the header row of a corresponding cleaned file does not have any parameter values and simply reads HREC GPRMC 4 3 2 Derived Travel Diaries The derived travel diary constitutes the fundamental output from the GPSTDG software The file containing these derived travel patterns is written out in two formats The first file with a trp extension is a compact comma separated file with headers The second file is a flat file with a csv extension This file structure is useful for display and processing queries Further the file format can also be opened in EXCEL or other spreadsheet applications with ease for further analysis Format of the trp file The overall format of the trp file is as follows HREC WorkThresh HomeThresh SpeedThresh Dwell Time MinWorkDur HHVe
29. ation is the duration of trip is seconds StartTAZ is the TAZ identifier for the trip start location EndTAZ is the TAZ identifier for the trip end location StartLU is the land use at the trip start location EndLU is the land use at the trip end location StartActivity is the activity type pursued by the driver of the vehicle at the origin of the trip an aggregate classification scheme is used in the basic analysis and a disaggregate analysis scheme is used in the enhanced analysis EndActivity is the activity type pursued by the driver of the vehicle at the destination of the trip the classification scheme is same as that for StartActType StartLat is the latitude of the trip start location StartLong is the longitude of the trip start location EndLat is the latitude of the trip end location EndLong is the longitude of the trip end location StartDate is the date and time of the start of the trip EndDate is the date and time of the end of the trip TripLengthl is the trip length in miles computed using the instantaneous position information AvSpeedl is the average speed of the trip miles per hour computed speed computed as ratio of distance between successive GPS records to the time stamp between successive records VarSpeedl is the variance is the speed over the length of the trip speed computed as ratio of distance between successive GPS records to the time stamp between successive records TripLength2 is the trip len
30. case the software will not determine the trip end locations in terms of TAZs ct Dem Lamai innin S XR Look in a SpatialData y em Fe My Recent Documents Desktop My Documents ue BE My Computer mm Is amp File name LaredoTaz shp Select TAZ File My Network Places Files of type Taz ArcGis files y Cancel LUTrimmed shp Clicking the Select Demographics File button opens the Select Demographics File window The user can navigate to the file containing the household and person level characteristics of the survey respondents and click the Select Demographics File button to select the file This is a comma separated file with a demo extension The detailed structure of this file is discussed in Section 4 1 2 16 GPS TDG v1 0 User s Manual in Nam IMAamarranhin px Select Demographics File ie B Lock in a Laredo y 3 paa My Recent Documents e 6 LaredoTest demo Desktop My Documents BE My Computer c 3 File name LaredoTest derno Select Demographics File My Network Fies of type Demographics File v Clicking the Select Relation File button opens the Select Relationship File window The user can navigate to the file that associates or links each vehicle with one member of household called the primary driver Click the Select Relationship File b
31. cation h location for classifyine the tri quon 03 mil Distance Threshold loca ion or classifying the trip end activity purpose as 3 miles Home Maximum distance between a trip end location and work Work Location locat f pri daver for thet 4 0 5 mil Distance Threshold W ocation o primary river for classifying the trip en 5 miles activity purpose as Work Work Duration d Minimum activity duration at a trip end for classifying a 3600 sec Threshold trip end activity as Work Average duration between successive navigational points recorded by the GPS instrument used in the survey Hsec Minimum Trip Minimum trip duration for a potential trip to be classified 3 mt 120 Duration Threshold as areal trip Minimum Trip Length Minimum trip length distance for a potential trip to be ml vd 1 miles Threshold classified as a real trip there is no value following this flag In order to change the parameters via the Options Box in the Command Area the parameter flag followed by the appropriate value if needed should be provided as already described in Section 3 2 Alternately the analyst can also make changes to the 33 GPS TDG v1 0 User s Manual GPSTDG options file again by simply changing the flags and or parameter values This file with the default flags parameter values is presented in Appendix B 4 3 OUTPUTS There are two main outputs generated by the GPS TDG software These are
32. cent to the check box The aggregation is then performed over trips that fall within this period i e trips that start at or after 3 30 PM and end at or before 6 30 PM The analyst can also specify selection criteria from the Pre Defined tab In this case the user chooses one of the three commonly used trip purposes i e home based work home based other and non home based as the selection criterion Once the user has specified the Aggregate By and Select By options clicking on the button Execute Query runs the query and the aggregate measures generated i e number of trips average trip length average trip duration and average trip speed are displayed in the Data Area of the main window The structure of this spreadsheet is discussed in Section 3 3 23 GPS TDG v1 0 User s Manual 3 3 THE DATA AREA The Data Area is used to display the outputs generated in a spreadsheet format when either the Detect Trips or the Execute Query button is clicked As already discussed the Detect Trips generates the derived trips as output The structure of the output displayed in this case is described in Section 3 3 1 The Execute Query generates aggregate measures such as number of trips and average trip speeds as the output The structure of the output displayed in this case is described in Section 3 3 2 3 3 1 Trips Display The trips are displayed in the conventional trip diary format Each row of display corresponds to a
33. e the set of explanatory variables that can be used are pre determined These variables and the specification structure are discussed below Example specification of parameters for one of the activity purpose types MREC Serve_passenger_at_otherlocation 0 0 0 0 0 0 0 9835 0 0 0 0 0 0 0 0384 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1509 5 8298 The first entry in this record is MREC identifying this record contains model parameters The second field has the name of the activity type The subsequent records represent the coefficients on the explanatory variables corresponding to this activity type The sequence of explanatory variables and their descriptions are provided in the table below 31 GPS TDG v1 0 User s Manual Variable Name Industrial_or_warehouse 1 if the trip end falls in a zone with industrial or 3 warehouse land use 0 otherwise 1 if the trip end falls in a zone with institutional 4 Institutional land use 0 otherwise 1 if the trip end falls in a zone with retail or office 5 Retail office_space land use 0 otherwise 1 if the trip end falls in a zone with LDR land use 6 LDR 0 otherwise 1 if the trip end falls in a zone with MDR or HDR 7 MDR_or_HDR land use 0 otherwise 1 if the trip end falls in a zone with blank or no 8 No_land_use land use 0 otherwise 9 Trip_duration Duration of the trip in seconds 10 Activity_duration Duration of the activity at trip end in seconds 1 if trip ends betwee
34. e ODBC Text Setup window opens up Enter TripsDSN as the Data Source Name _ a ong Data Source Name TripsDSN Description Cancel I I Database Help Directory Select Directory Use Current Directory Options gt gt the indicated data provider A User data source is only visible to you and can only be used on the current machine ODBC User data source stores information about how to connect to Uncheck the Use Current Directory checkbox and click Select Directory The Select Directory window opens up Navigate to C GPSTDG Trips and click OK Click OK to save all changes made GPS TDG v1 0 User s Manual Select Directory guitest106 csy guitest107 csv guitest108 csv guitest108 csv quitest110 csw quitest111 csv guitest120 csv quitest122 csv The ODBC Data Source Administrator window now appears as shown below ODBC Data Source Administrator Microsoft dBase Driver dbf Microsoft Excel Driver xls MS Access Database Microsoft Access Driver TripsDSN Microsoft Text Driver txt csv GPS TDG v1 0 User s Manual 10 GPS TDG v1 0 User s Manual 3 The GPS TDG Environment The GPS TDG provides a swing based graphical interface for the user to interact with the software to derive the travel patterns from GPS streams and to query the derived travel diaries in many ways This chapter describes the basic elemen
35. e TAZ Ids are provided in the 7 column called TAZ in the underlying database 4 1 4 A GIS Land Use Layer The GIS land use layer is also to be provided in the ESRI shape file format Again the software is capable of handling this spatial data any co ordinate system However the land use variable must be provided in the 4 column called LANDUSE in the underlying database Further the following zonal land use classification scheme must be used LDR MDR HDR HEAVY INDUSTRIAL INSTITUTIONAL RETAIL OFFICE AG WATER PARK REC OPEN SPACE and WAREHOUSE LT 4 2 PARAMETER INPUTS GPS TDG takes two types of parameters as inputs 1 Specification of the MNL model for activity type classification and 2 Algorithm parameters These are discussed in further detail below 4 2 1 MNL Model Specification The disaggregate activity type classification and the parameters of the MNL model i e coefficients on the explanatory variables are specified using a comma separated file The first row of input defines the structure of this file Each subsequent row of this file comprises the set of parameters defining the utility function for one activity purpose The parameters are input in the sequence defined in the first line The analyst can classify the activities into any number of disaggregate purposes and provide the appropriate number of rows of input In this version of the softwar
36. e software This chapter is also intended as a simple tutorial to help analysts familiarize themselves with the software and to interpret outputs GPS TDG v1 0 User s Manual GPS TDG v1 0 User s Manual 2 System Requirements and Installation Instructions The software describes the minimum system requirements for running the software and instructions for installation The system requirements are presented in Section 2 1 and the installation procedure is outlined in detail in Section 2 2 2 1 MINIMUM SYSTEM REQUIREMENTS The software has been developed in Java and is therefore portable across platforms However we recommend the following system configuration for which the software has been tested e Windows XP operating system e 2 GHz CPU e 512MB RAM for the basic mode and 1GB RAM for the enhanced mode In addition to the above system requirements the user should also have the following software installed e ArcGIS 9 0 either an ArcEngine runtime license or an ArcView license e Microsoft Office 2003 or higher e Java Runtime Engine 1 4 2 or higher 2 2 INSTALLATION The installation of the software comprises three main steps First the software provided as a self extractable file has to be copied onto the computer and unzipped Section 2 2 1 Next appropriate environment variables have to be defined Section 2 2 2 Finally a Data Source Name DSN has to be created Section 2 2 3 2 2 1 The Self Extractable File The s
37. ect Model Parameters File button Navigate to C GPSTDG ModelParameters csv and select this file 40 GPS TDG v1 0 User s Manual 9 This run will be performed using the default algorithm parameters as indicated in Section 4 2 2 and provided in the CAGPSTDGIGPSTDG options file Hence the Options text box is to be left blank 10 Click on the Detect Trips button This triggers the software run A progress bar pops up to indicate processing progress Files LaredoE trp and LaredoE csv are created in the directory C GPSTDG Trips When the run is complete the output is loaded into the Data Area as shown below GPS Travel Diary Tools Help Vehld Driverld OriginalTripNo TripNo TripDuration StartTaz EndTaz Start LU End LU Start Basic Enhanced Query 10049871 10049872 1 35 177 Unzoned Unzoned Home 10049871 10049872 2 2 147 175 162 LDR Unzoned School _ 10049871 10049872 3 3 158 162 159 Unzoned Unzoned Serve en 10049871 10049872 4 4 232 160 148 Unzoned RETAIL OFFI Persor TESI GES GPSClean1 10049871 10049872 6 5 389 h 48 163 Unzoned Unzoned Persor Select TAZ LaredoTaz shp 10049871 0049872 6 376 163 177 Unzoned Unzoned Grocer AA 10049871 10049872 8 z 283 177 173 Unzoned LDR School Select Dem Laredo demo 10049871 10049872 9 8 225 162 147 Unzoned Unzoned Serve_
38. for GIS processing The software has been designed to operate either in a basic analysis mode or in an enhanced analysis mode The basic mode converts the GPS data into a simple trip file that distinguishes among home based work home based other and non home based trips The enhanced mode utilizes additional land use data and pre estimated model parameters to derive more refined trip purpose classification taxonomy Finally the software is also capable of aggregating the derived trip diaries to produce inter zonal vehicle trip tables and network performance measures average trip speed distance and travel time These measures can be generated in the overall or for specific trip purposes or for specific times of the day Detailed descriptions of the state of the art in GPS based travel surveys the algorithms incorporated within the GPS TDG software implementation details and testing and validation results are provided in three research reports produced as part of the project This document is developed as an instructional guide to help analysts use the GPS TDG software The rest of this manual is organized as follows Chapter 2 describes the system requirements and installation instructions Chapter 3 provides an overview of the GPS TDG environment including a long name of the menus and commands available Chapter 4 discusses inputs and outputs Finally Chapter 5 guides the user through the basic operations using sample data files provided with th
39. g and value separated by space into the options box For example the analyst can change both the engine power off and non engine power off dwell time thresholds to 45 seconds by entering t 45 t2 45 in the options box The complete list of flags associated with the parameters is presented in Section 4 2 2 The analyst can also modify these parameters by making changes to the underlying GPSTDG options file It should be noted that the values input via the text box are not saved to the options file Therefore the analyst can conveniently use the text box for the purposes of testing parameter values and finally incorporate the preferred values in the GPSTDG options file for all subsequent analyses Clicking the Detect Trips button runs the trip detection and characterization algorithm implemented within the software A Progress Bar pops up which displays the name of the file containing the preprocessed GPS streams of the vehicle currently being processed and the percentage of all vehicles that have been processed see section 3 2 2 on Enhanced Pane for a progress bar screen shot On completion of the run the trp and csv output files as discussed above are generated and the csv file is loaded automatically into the data area The structure of this spreadsheet is discussed in Section 3 3 3 2 2 The Enhanced Pane The Enhanced Pane of the Command Area allows the user to specify inputs run the trip detection in the enhanced
40. gender of the individual 1 if male This is required only for enhanced analysis If the software is to be run only in the basic mode this user can specify a value of zero for this field The Relationship File The relationship file also called the link file is used to specify an association between each vehicle equipped with a GPS device and a member of the household who is the primary driver of this vehicle Hence this file provides a link between the files containing the GPS streams and the person level information contained in the Demographics File There is one record in this file for each GPS equipped vehicle in the survey This is a comma separated file with a link extension Example LREC 040802_1001373_V1 dlv 1001373 1 1 Generic Format GPSFilename HHID VehID PersID 1 Ze LREC is a record type identifier indicating that this is a record in the link file GPSFilename is the name of file containing the raw GPS stream corresponding to the vehicle VehID HHID is the identifier for the household 4 VehlD the identifier for the GPS equipped vehicles in a household PersID is the identifier for the primary driver in the household associated with the vehicle VehlD 30 GPS TDG v1 0 User s Manual 4 1 3 A GIS Layer of TAZ Boundaries The TAZ boundaries GIS layer is to be provided as an ESRI shape file The software is capable of handling any co ordinate system as along as th
41. gth in miles computed using the instantaneous speed information AvSpeed2 is the average speed of the trip miles per hour computed using instantaneous speed data VarSpeed2 is the variance is the speed over the length of the trip 37 GPS TDG v1 0 User s Manual 23 StartTOD is the time of day of start of trip in the hhmm format for example 1527 refers to 3 27 PM 24 EndTOD is the time of day of end of trip in the hhmm format 25 NRecRatio is an accuracy measure computed as the ratio of the number of valid GPS records corresponding to this trip to the total number of records for this trip Format of the csv file The comma separated file or the flat file has all the information as the trip records in the trp file The first field of a record in this file has the entry TR indicating a trip record The next two fields are respectively the vehicle and driver identifiers 1 e the HHVehID and HHPersID variables in the trp file The next twenty four columns correspond respectively to the fields 2 25 in the trip records of the trp file 38 GPS TDG v1 0 User s Manual 5 Basic Operations This chapter of the report describes the three basic operations that an analyst performs using the software These are 1 Pre processing GPS streams 2 Running the trip detection algorithm and 3 Querying the outputs Instructions for performing each of these operations are presented in this cha
42. hlD DriverID TR OriginalTripNo TripNo TripDuration StartTAZ EndTAZ StartLU EndLU StartActivity EndActivity StartLat StartLong EndLat EndLong StartDate EndDate TripLengthl AvSpeedl VarSpeedl TripLength2 AvSpeed2 VarSpeed2 StartTOD EndTOD NRecRatio HHVehID NumTrips TREC TripCount VehCount The first record in this file is a header characterized by the entry HREC in its first field This header record sequentially includes the values of all the threshold parameters used in the travel diary extraction algorithm The complete format of this header is as follows HREC WorkThresh HomeThresh SpeedThresh DwellTime MinWorkDur 1 HREC is a record type identifier indicating that this is a header record in the output file 2 WorkThresh is the parameter defining the maximum distance between a trip end location and work location of primary driver for classifying the trip end activity purpose as Work 3 HomeThresh is the parameter defining maximum distance between a trip end location and home location for classifying the trip end activity purpose as Home 4 SpeedThresh is the parameter for trip distance computation If the value of instantaneous speed is below this threshold this GPS point is not used in distance computation 35 GPS TDG v1 0 User s Manual 5 DwellTime is the parameter defining the minimum dwell time gap between successive valid GPS records for signalling
43. ield takes the value A if the record is valid or otherwise Latitude is the instantaneous latitude position recording ddmm mmmm format Lat_Hem represents the latitude hemisphere N North and S South Longitude is the instantaneous longitude position recording dddmm mmmm format Long_Hem represents the longitude hemisphere E East and W West Speed is the instantaneous speed recoding in knots values between 0 and 999 9 Heading is the direction of movement in degrees 0 to 359 9 degrees 10 11 12 Date is the UTC date in the DDMMYY format Blank is a blank entry Checksum the 03 entry in the example If data is recorded in the GPRMC format identifiers for the GPS unit the household and the vehicle have to be manually added to files containing the GPS streams This is accomplished by adding a single line header with the identifiers to each raw GPS stream file The identifiers are in the following sequence GPSID HHID VehID 28 GPS TDG v1 0 User s Manual 4 1 2 Individual and Household Characteristics Data on individual and household characteristics of the survey respondents are provided as two files 1 The Demographics File and 2 The Relationship File The first file includes the household and work locations of the survey respondents and other characteristics that are required for activity type determination in the enhanced mode The second file associates or links each vehicle equip
44. iles that the software generates This chapter is organized as follows Section 4 1 describes the data inputs to the software Section 4 2 describes the parameter inputs to the software and Section 4 3 describes the outputs 4 1 DATA INPUTS There are four main data inputs required for GPSTDG These are 1 Raw GPS navigational streams 2 Individual and household characteristics 3 A GIS layer of TAZ boundaries and 4 A GIS land use layer Each of these is discussed in the following sections 4 1 1 Raw GPS Navigational Streams The raw GPS navigational streams represent the GPS data largely in the same format in which they have actually been recorded by the in vehicle devices It is assumed that the stream from each vehicle is saved as a separate comma separated file i e one file per surveyed vehicle with each line comprising a sequence of data elements in a pre defined format this sequence is also called a sentence The software is capable of handling sentences that are either in the GPRMC or in the GeoLogger format The raw GPS files are to be named with a dlv extension if they are in the GeoLogger format and with a gprmc extension if they are in the GPRMC format The sentence structures of the two formats are presented below The GeoLogger Sentence Format Example 5 273 1005361 1 03 25 02 13 13 24 03 25 02 07 13 24 27 52020 99 46400 00134 0 00 00 0 01 8 00 Generic Structure RecType GPSID HHID
45. is complete the output is loaded into the Data Area as shown below GPS Travel Diary Tools Help Vehld Driverld OriginalTripNo TripNo TripDuration StartTaz EndTaz Start LU End LU Start Basic Enhanced Query 10048871 10049872 1 1 355 172 177 Unzoned Unzoned Home 10049871 10049872 2 2 147 175 162 Unzoned Unzoned Other 10049871 10049872 3 3 158 Ir 62 159 Unzoned Unzoned Other 10049871 10049872 4 4 232 160 148 Unzoned Unzoned Other _select crs GPSClean 10049871 10049872 5 5 388 148 163 Unzoned Unzoned Other Select TAZ LaredoTaz shp 40049871 10048872 7 6 376 hes 177 Unzoned Unzoned Other 10049871 10049872 8 7 283 177 173 Unzoned Unzoned Other Select Dem Laredo demo 10049871 10048872 8 8 225 162 147 Unzoned Unzoned Other 10049871 10049872 10 9 180 h 48 20 Unzoned Unzoned Other Select Reisti Laredo link 10049871 10049872 1 10 209 68 Unzoned Unzoned Other 10049871 10049872 14 11 360 173 177 Unzoned Unzoned Other _seestoup LaredoB 40058081 10058081 8 1 285 159 124 Unzoned Unzoned Home 10058081 10058081 6 2 528 137 178 Unzoned Unzoned Other 10058081 10058081 8 3 405 h 77 159 Unzoned Unzoned Other 10058081 10058081 9 4 168 159 137 Unzoned Unzoned Other 10058081 10058081 13 5 281 148 28 Unzoned Unzoned Other 10058081 10058081 17 6 326 22 158 Unzoned Unzo
46. mputer b File name C Walid Laredo GPSClean Select Target Directory My Network Fies of type al Fies Cancel Once the input and output directories are chosen the pre processor runs in the background A window pops up to indicate completion of pre processing StartActivity EndActivity StartDate EndDate TripLengtt Basic Enhanced Query Select GPS GPS File Direc Select TAZ Taz file Select Dem DemoGraphic Select Relat Relationship file Select Outp Output file J Finished preprocessing Options Detect Trips The processing time depends on the number and size of the input files One output file is generated for each file input i e one for each GPS equipped vehicle The output 13 GPS TDG v1 0 User s Manual files have a cln extension The detailed structure of this preprocessed output GPS stream file is presented in Section 4 3 1 3 1 2 The Help Menu The Help Menu has two items Choosing the About menu item displays the software version and author information Choosing the Online Help item opens the web browser to the help web page http www ce utexas edu prof bhat GPSTDG UserManual pdf 3 2 THE COMMAND AREA The Command Area provides the fundamental interface for the user to run the software to derive
47. n 7 AM and 9 AM 0 11 7_AM_9 AM otherwise 1 if trip ends between 9 AM and 2 PM 0 12 9 AM 2 PM otherwise 1 if trip ends between 2 AM and 6 PM 0 13 2 PM 6 PM otherwise 14 after 6 PM if trip ends after 6 PM 0 otherwise 15 Trip origin is home 1 if the trip originates at home 0 otherwise 16 Trip_origin_is_work 1 if the trip originates at work 0 otherwise 17 Employed 1 if the primary driver is employed 0 otherwise 18 Student 1 if the primary driver is a student 0 otherwise 19 Male 1 if the primary driver is male 0 otherwise 20 Number of children in HH Number of children in the household 21 Constant Alternative specific constant The default MNL model parameters provided with the software were estimated using data from Laredo employing a nine way classification scheme for the activity types The complete empirical specification of this model in the input format is presented in Appendix A The reader is referred to Report 2 for the model estimation details 4 2 2 Algorithm Parameters The trip detection and characterization algorithm implemented in the GPS TDG software is controlled by several user specified parameters The values of these parameters can be varied as required by the analyst to suit the requirements of different study areas and for various analysis objectives A description of all the user defined parameters is presented in table below Our prescribed default values are also provided 32 GPS TDG v1 0 User s Manual P
48. nal 8 27 4 1 2 Individual and Household Characteristics eese 29 4 1 3 A GIS Layer of TAZ Boundaries eese entente enne 31 BT A AGIS Land Use Layer C Re hec t e de e e RE E EAR e 31 42 PARAMETER INPUTS 2 0222 hassen ernennen 31 4 2 1 Model Specification eese sees eene enne 31 4 2 2 Algorithm Parameters e hi ede i eura een OR enda 32 4 3 OUTPUTS o e RP dep dude utor Rede 34 4 3 1 Pre Processed GPS Streams eee eee esee eene ette aeterni ertet 34 4 3 2 Derived Travel Diaries en are i ee teo dee RE eigo 35 5 BASIC OPERA TIONS e O 39 5 1 SAMPLE DATA DESCRIPTION lenie pa e aeoe ae a REE S 39 5 2 PREPROCESSING GPS STREAMS tirain enito enera ons ons 40 3 3 RUNNING TRIP DETEBGTIQON eere rite ene eee e ente E N be a rere E 40 5 3 1 Enhanced Trip Detection rirerire i E sees eene entente entente nr innen ens 40 3 3 2 Basic Trip Detection 1 ee ett deside beck n be diete as 41 5 4 RUNNING QUERIES AND INTERPRETING RESULTS eee 42 Appendix RN 47 Appendix EE 49 GPS TDG v1 0 User s Manual 1 Introduction For nearly fifty years household travel surveys have been used to document the travel behavior of regional households as part of long range transportation planning efforts The survey data are used for general planning and policy analysis
49. ned Other 10058081 10058081 19 7 334 1159 125 Unzoned Unzoned Other 10058081 10058081 20 8 289 h 25 109 Unzoned Unzoned Other 10058081 10058081 21 9 620 109 103 Unzoned Unzoned Other 10058081 10058081 22 10 647 103 136 Unzoned Unzoned Other 10091221 10091221 1 1 479 134 124 Unzoned Unzoned Home 10091221 10091221 2 2 122 125 195 Unzoned Unzoned Other 10091221 10091221 3 3 491 1134 124 Unzoned Unzoned Other 10091221 10091221 4 4 394 126 134 Unzoned Unzoned Other 10016171 10016171 1 1 471 102 95 Unzoned Unzoned Home 10016171 10016171 2 2 1692 95 102 Unzoned Unzoned Work E 10029442 10029442 1 1 531 194 189 Unzoned Unzoned Home Options 10029442 10029442 2 2 298 189 99 Unzoned Unzoned Other nn 10029442 10029442 2 3 582 ES 93 Unzoned Unzoned Other 10029442 10029442 2 4 184 las 94 Unzoned Unzoned Other 10056352 10056355 1 1 555 161 95 Unzoned Unzoned Home 10056352 10056355 2 2 756 95 92 Unzoned Unzoned Work 10056352 10056355 3 3 1091 92 97 Unzoned Unzoned Other 10056352 10056355 4 4 342 97 61 Unzoned Unzoned Other 10101431 10101431 1 1 679 93 95 Unzoned Unzoned Home 10101431 10101431 2 2 294 95 190 Unzoned Unzoned Other 10101431 10101431 4 3 412 95 190 Unzoned Unzoned Work 10101431 10101431 5 4 357 90 95 Unzoned Unzoned Other 10101431 10101431 z 5 419 93 B Unzoned Unzoned Other sal DADA any nana any lana an ar Te er ann Gmail The reader will note that 1 the StartLU and EndLU columns have the entry Un
50. ns 10029442 10029442 2 4 184 93 94 RETAIL OFFI Unzoned Social 10056352 10056355 1 1 555 61 95 Unzoned INSTITUTION Home 10056352 10056355 2 2 756 95 92 INSTITUTION INSTITUTION Work 10056352 10056355 3 3 1091 92 97 INSTITUTION RETAIL OFFI Serve_ 10056352 10056355 4 4 342 97 61 Unzoned Unzoned Persor 10101431 10101431 1 1 679 93 95 RETAIL OFFI Unzoned Home 10101431 10101431 2 2 294 95 190 Unzoned LDR Serve_ 10101431 10101431 4 3 412 95 190 RETAIL OFFI LDR Work 10101431 10101431 5 4 357 190 95 Unzoned INSTITUTION Persor 10101431 10101431 z 5 419 ES 97 LDR RETAIL OFFI Serve_ al https co GPST amp untitle 5 3 2 Basic Trip Detection The following are the steps for running GPS TDG software in the Basic Mode 1 Click on the Basic Pane in the Command Area Follow steps 2 5 as described in Section 5 3 2 3 Click on the Select Output File button Enter LaredoB as the file name and click OK 4 This run will be performed using the default algorithm parameters as indicated in Section 4 2 2 and provided in the C GPSTDG GPSTDG options file Hence the Options text box is to be left blank 41 GPS TDG v1 0 User s Manual 5 Click on the Detect Trips button This triggers the software run A progress bar pops up to indicate processing progress Files LaredoB trp and LaredoB csv are created in the directory C GPSTDG Trips When the run
51. nual Basic Enhanced Query Select GPS File Directory GPSClean Select TAZ File LaredoTaz shp Select Demographics F LaredoTest demo Select Relation File Relationship file Select Output File Output file Options Detect Trips Clicking the Select GPS File Directory button opens the Select GPS Directory window The user can navigate to the directory containing the pre processed GPS streams and click the Select GPS Directory button to select the files This directory C GPSTDG Laredo GPSClean below should contain comma separated files output from the preprocessor and with cIn extensions The structure of these files is discussed in Section 4 3 1 15 GPS TDG v1 0 User s Manual Pre ee ee uu Selec Selec Re My Recent Documents Option a File name C GPSTDG Laredo GPSClean Select GPS Directory My Network RE Fies of type All Fies Cancel Clicking the Select TAZ File button opens the Select TAZ File window The user can navigate to the GIS file containing the boundaries of the traffic analysis zones TAZs of the study area and click the Select TAZ File button to select the file the TAZ file is the LaredoTaz shp below This GIS file is provided in the ESRI shape file format with a shp extension Specifications of this file are discussed in Section 4 1 3 The user should note that trip detection can be performed without providing this input In this
52. oftware is provided in a CDROM as a self extractable zip file GPSTDG EXE Copy this file onto the C drive of your computer and unzip it This creates the C GPSTDG directory in which the software is installed The C GPSTDG directory will contain the following files and folders 1 The GPSTDG jar is the java executable file Running this executable runs the software 2 The GPSTDG desc is a short file describing the functionality of the jar file 3 The GPSTDG bat file contains the command line code to run the executable file The user runs the software by simply double clicking the GPSTDG bat file 4 Acopy of the GPSTDG user s manual UserManual pdf GPS TDG v1 0 User s Manual 5 The GPSTDG options file which contains the algorithm parameters discussed further in Section 4 2 2 6 The ModelParameters csv file which has the empirical specification for the multinomial logit model estimated for activity type classification using data from Laredo discussed further in Section 4 2 1 7 The CAGPSTDGyava folder containing several java related sub folders and files 8 The C GPSTDG Laredo folder containing sample data files for running the software These files are discussed further in Chapter 5 9 The C GPSTDG Trips folder would be the default folder to which the generated trip files will be written out Also see section 2 2 3 This folder also contains outputs corresponding to the above inputs and using the algorithm parameter
53. ped with the GPS device with one member of the household called the primary driver The structure of these files is presented below The Demographics File This is a comma separated file with a demo extension This file comprises two types of records the household record and the person record The surveyed households are represented sequentially in this file Each household is represented by one household record followed immediately by one or more person records Every person in the household who has been identified as a primary driver of a GPS equipped vehicle should be represented by a person record Individuals who are not primary drivers for example adults without a driver s license and children need not be included in this file Example representation for a household with one primary driver DREC 1 1001373 99 470800 27 469860 2 DREC 2 1001373 1 1 99 479140 27 571130 1 1 The generic structure of the household record is as follows DREC RecType HHID HomeLocLat HomeLocLong NumChild 1 DREC is a record type identifier indicating that this is a record in a demographics file 2 RecType is the identifier used to distinguish between household and person records in the location and demographics file Household records have an entry 1 HHID is the identifier for the household HomeLocLat is the latitude of the home location in decimal degrees HomeLocLong is the longitude of the home location in decimal deg
54. pter Further these discussions are in the context of the sample data files provided along with the software The rest of this chapter is organized as follows Section 5 1 describes the sample input files provided along with the software Section 5 2 describes pre processing the GPS streams Section 5 3 describes running the software in both basic and enhanced modes Finally Section 5 4 describes the procedures for querying the results and interpreting the results 5 1 SAMPLE DATA DESCRIPTION Sample electronic data files are provided in the folder C GPSTDG Laredo This folder contains the following input data files and folders 1 Laredo demo is the demographics file This file has data for 13 drivers from 12 households The structure of this file is consistent with the description provided in Section 4 1 2 2 Laredo link is the relationships file This file links each vehicle represented by files in the GPS folder with a primary driver represented as person records in the Laredo demo file Again the structure of this file is consistent with the description provided in Section 4 1 2 3 The folder GPS contains the raw GPS streams from 53 vehicles Each file in this folder represents streams in the Geologger format from a single vehicle These file names have dlv extensions and are consistent in format with the description provided in Section 4 1 1 4 The folder SpatialData has GIS files for 1 the TAZ boundaries for the Laredo
55. re Defined Select By Value By starti By endin O By startT By endTi By start By endA Execute Query a User Y LSO e The reader will note that there are 84 trips in the overall The average trip length is 3 54 miles the average trip duration is 502 seconds and the average trip speed is 29 miles per hour Trip table and inter zonal performance measures To obtain the inter zonal performance measures and the trip table check the By Starting TAZ and By ending TAZ boxes under the Aggregate By section of the Query Pane and click the Execute Query button The output comprises one row of data for each zonal pair represented in the data as shown below 43 GPS TDG v1 0 User s Manual GPS Travel Diary Tools Help StartTaz EndTaz Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query 24 136 1 2 77432301712726 6440 22 252073 22 158 1 2 15466224982879 3250 26 29194 Query Options 23 68 1 2 85676831402093 2090 57 079906 55 101 1 249853956603812 4050 3248414 61 95 1 4 80286888811832 5550 34 67584 te 62 93 1 4 64076013237672 5730 32 147343 User Defined 62 123 4 1 41801446011944 2230
56. rees NumChild is the number of children age lt 16 in the household This is required only for enhanced analysis If the software is to be run only in the basic mode this user can specify a value of zero for this field ON Oe dm us The person record has the following generic format DREC RecType HHID PersID EmpFlag WorkLocLat WorkLocLong Student Male 1 DREC is a record type identifier indicating that this is a record in the locations and demographics file 29 GPS TDG v1 0 User s Manual 2 RecType is the identifier used to distinguish between household and person records in the location and demographics file Person records have an entry 2 3 HHID is the identifier for the household 4 PersID is the identifier for a person primary driver in the household 5 EmpFlag is a binary flag used to indicate the employment status of the individual 1 if employed 6 WorkLocLat is the latitude of the work location in decimal degrees provide a value of zero if the person is not employed 7 WorkLocLong is the longitude of the work location in decimal degrees provide a value of zero if the person is not employed 8 Student is a binary flag used to indicate the student status of the individual 1 if a student This is required only for enhanced analysis If the software is to be run only in the basic mode this user can specify a value of zero for this field 9 Male is a binary flag used to indicate the
57. row of output which represent the total number of trips in the file and trip length duration and speed averaged over the entire trip file The Select By Options As already discussed the Select By option allows the user to perform the aggregations over a subset of trips satisfying particular criteria as opposed to the entire trip file If none of the Select By options are checked the aggregation is performed over the entire trip file The Select By options are further categorized and provided under the user defined and Pre Defined tabs Using the options under the User Defined tab the analyst can define a subset of trips for aggregation based on one or more of the following criteria trip end location trip timing and trip end activity types The criteria are chosen by checking the appropriate boxes and entering the required values For example to define a subset of trips ending at work check the By End Activity box and choose Work as the value from the adjacent drop down list The drop down list is editable and therefore the analyst can also enter disaggregate activity types as appropriate To define a specific time period for aggregation for example the PM peak period of 3 30 to 6 30 PM first check the By start time box and enter the value i e 15 30 in the editable list adjacent to the check box Next check the By end time box and enter the value i e 18 30 in the editable list adja
58. ry window pops Navigate to C GPSTDG Laredo GPSClean and click the Select Target Directory button This triggers the pre processor to run 6 The completion of the run is indicated by a pop up window The pre processed GPS stream files can be found in the C GPSTDG Laredo GPSClean folder 5 3 RUNNING TRIP DETECTION Once the GPS streams have been pre processed the trip detection component of the software can be run The procedure to run the software in the Enhanced Mode is described in Section 5 3 1 The simplified procedure for running the software is run in the Basic Mode is discussed next in Section 5 3 2 5 3 1 Enhanced Trip Detection The following are the steps for running GPS TDG software in the Enhanced Mode 1 Click on the Enhanced Pane in the Command Area 2 Click on the Select GPS Directory button Navigate to C GPSTDG Laredo GPSClean and select this directory 3 Click on the Select TAZ File button Navigate to C GPSTDG Laredo S patialData LaredoTAZ shp and select this file 4 Click on the Select Demographics File button Navigate to C GPSTDG Laredo Laredo demo and select this file 5 Click on the Select Relation File button Navigate to C GPSTDG Laredo Laredo link and select this file 6 Click on the Select Output File button Enter LaredoE as the file name and click OK 7 Click on the Select LandUse File button Navigate to C GPSTDG Laredo SpatialData LUTrimmed shp and select this file 8 Click on the Sel
59. s from GPSTDG options file and the MNL model from the ModelParameters csv file These output files are discussed further in Chapter 5 10 The C GPSTDG gprmctest folder which contains sample GPS streams data in the GPRMC format Important Note Subsequent instructions for creating environment variables and DSN are provided assuming that the software is installed in folder C GPSTDG If the software is being installed to a different location these instructions have to be suitably modified In addition the user will have to edit the GPSTDG bat file right click on the file and select Edit and add the path to the trip file location to the end of the existing command For example if the path to the trips file location is to be F GPSTDG trips the command needs to be modified to javaw jar GPSTDG jar F GPSTDG trips By default the command on the bat file reads javaw jar GPSTDG jar 2 2 2 Defining Environment Variables Prior to running the software it is necessary to create or modify three environment variables These variables are ARCENGINEHOME CLASSPATH and PATH Detailed instructions for defining these variables are presented below GPS TDG v1 0 User s Manual Right click on My Computer and select Properties The System Properties window opens System Properties 2 xl System Restore Automatic Updates Remote General Computer Name Hardware Advanced System Microsof
60. t HHVehID NumTrips where 1 VT is a record type identifier indicating that this is a vehicle trailer record 2 HHVehID the identifier for the GPS equipped vehicles in a household This is created by appending the vehicle ID to the household ID 3 NumTrips is the total number of trips detected for this vehicle This is equal to the number of trip records included between the header and the trailer records of a particular vehicle Each trip record in this file contains the characteristics of a single trip in the following format 36 GPS TDG v1 0 User s Manual TR OriginalTripNo TripNo TripDuration StartTAZ EndTAZ StartLU EndLU StartActivity EndActivity StartLat StartLong EndLat EndLong StartDate EndDate TripLengthl AvSpeedl VarSpeedl TripLength2 AvSpeed2 VarSpeed2 StartTOD EndTOD NRecRatio where 1 2 2 pes esI NU olo 10 11 12 13 14 15 16 17 18 19 20 21 22 TR is a record type identifier indicating that this is a trip record OriginalTripNo is the trip number assigned originally to all potential trips These trips are subsequently classified as either true trips and retained or as false trips and discarded Further a single potential trip could also be broken into two or more trips if non engine power off stops are detected TripNo is a trip identifier The trips are sequentially numbered over the final set of true trips TripDur
61. t Windows XP Home Edition U Version 2002 I3 Service Pack 2 28 Registered to LN Prabuddha 55277 0 0011903 00102 Manufactured and supported by Dell Computer Corporation Dell INSPIRON 600M Intel R Pentium R M processor 1 50GHz 1 50 GHz 512 MB of RAM Support Information Click on the Advanced tab System Restore 1 Automatic Updates Remote General Computer Name Hardware Advanced You must be logged on as an Administrator to make most of these changes Performance Visual effects processor scheduling memory usage and virtual memory Settings User Profiles Desktop settings related to your logon Settings r Startup and Recovery System startup system failure and debugging information Settings Environment Variables Error Reporting Cancel Click on the Environment Variables button The ARCENGINEHOME variable may be present under System variables with the path to where ArcGIS is installed on the comouter as shown in figure If not click the New button under System variables The New System Variable window pops up Enter ARCENGINEHOME as the variable name and the path to where ArcGIS is installed as the variable value for example C Program Files ArcGIS Click OK to save the changes GPS TDG v1 0 User s Manual Environment Yariables 2 x User variables for Prabuddha Variable Value CLASSPATH C Program Files Altovalxmlspy XMLSpy
62. trip end activity types This is done by selecting the appropriate check boxes under the Aggregate By section The aggregate measures computed are the number of trips average trip length average trip duration and average trip speed Further the aggregation can be done over the entire trip file or over a subset of trips satisfying specific criteria These subsets can be defined by selecting the appropriate boxes under the Select By section The Aggregate By and Select By options provided to the user are discussed further here 21 GPS TDG v1 0 User s Manual 22 GPS TDG v1 0 User s Manual The Aggregate By Options The software allows the user to generate aggregate measures by trip end locations and or activity types these activity types are aggregate if only the basic trip detection analysis was performed and disaggregate if the enhanced trip detection analysis was performed For example if the user checks the By starting TAZ box the aggregate measures are computed over trips originating in each TAZ Hence the output of this query will contain one row of measures i e number of trips average trip length average trip duration and average trip speed for each TAZ By checking both By starting TAZ and By ending TAZ boxes we get the OD trip table and the inter zonal level of service measures If none of the Aggregate By boxes are checked and no Select By options are chosen either we get one
63. ts of the software environment To run GPS_TDG double click on the DOS batch file GPSTDG bat This opens up the main window of the program which remains on screen as long as the software is being used This main window comprises 1 The Menu Bar 2 The Command Area and 3 The Data Area Each of these is described in detail in Sections 3 1 3 2 and 3 3 respectively GPS Travel Diary Tods Heb Menu Bar Basic Enhanced Query Select GPS Fie Directory GPSClean Select TAZ File LaredoTaz shp Select Demographics F LaredoTest demo LaredoTest link Select Output r e Output fie Data Area Command Area f Detect Trips E 11 GPS TDG v1 0 User s Manual 3 1 THE MENU BAR The Menu Bar comprises two menu items 1 Tools and 2 Help Each of these items is discussed in detail subsequently 3 1 1 The Tools Menu The tools menu allows the user to preprocess the raw GPS streams and convert it into a standard format for further use by the GPS TDG software This pre processing is a requirement and will be the first overall step in using the software for deriving the travel patterns The software is capable of taking as inputs the raw GPS streams that are in either the GPRMC or in the GeoLogger formats Correspondingly the user chooses either Preprocess GPRMC or Preprocess GEO from the drop down Tools menu Tools Help
64. ue text box enter CAGPSTDGyavayrelbin at the beginning of the text already in this text box Click OK to save the changes GPS TDG v1 0 User s Manual 2 2 3 Creating the DSN Data Source Name The software requires a DSN to exist in order to perform query operations To create this DSN first open the Control Panel from the Start Menu Next open the Administrative Tools folder double click on the administrative tools icon Now double click on the Data Sources ODBC icon This opens the ODBC Data Source Administrator window as shown below Excel Files ODBC Data Source Administrator Microsoft dBase Driver dbf Microsoft Excel Driver xls MS Access Database Microsoft Access Driver mdb GPS TDG v1 0 User s Manual Click on the Add button The Create New Data Source window opens up Scroll down the list and select the as Microsoft Text Driver and Click Finish 21 xi ODBC Data So Admin ato Create New Data Source x Select a driver for which you want to set up a data source Microsoft Excel Driver xls Microsoft Excel Treiber xls Microsoft FoxPro Driver dbf Microsoft ODBC for Oracle Microsoft Paradox Driver db Microsoft Paradox Treiber db Microsoft Text Driver txt csv Microsoft Text Treiber txt csv Microsoft Visual FoxPro Driver Visual EnwPro Traibar Do PP Pent es E umm Th
65. utton to select the file This is a comma separated file with a link extension The detailed structure of this file is discussed in Section 4 1 2 Select Relationship File Look in a Laredo 2 oA a My Recent D E zl LaredoTest link Desktop My Documents BE My Computer MEME File name Laredotest iink pee Reese rie Files of type Relationship File cms Clicking the Select Output File button opens the Select Output File window and allows the user to specify the output file name This will be created by default in CAGPSTDG Trips directory If you have set up the software differently the file is created at the location specified in the DSN Two files with the specified file name and extensions of trp and csv are written out Both files contain the same data but differ in their file structure and formats The structure of these two output files are discussed in Section 4 3 2 17 GPS TDG v1 0 User s Manual 2 Enter Output File Name The text box Options can be used by the analyst to modify several parameters that control the trip detection and characterization algorithm implemented within the software A description of these parameters and the default values are presented in Section 4 2 2 If this box is left blank the default parameters provided in the GPSTDG options file are used The user can modify selected parameters by entering the parameter fla
66. zoned reflecting the absence of land use data and 2 the StartActivity and EndActivity columns classify trip ends into one of three aggregate categories viz Home Work and Other 5 4 RUNNING QUERIES AND INTERPRETING RESULTS In this section we discuss some of the aggregation analysis that can be performed using GPSTDG We will use the output file generated from running the software in the Enhanced Mode i e LaredoE csv To load this data into the software for analysis first click on the Query Tab in the Command Area Click on the Select Trip File button navigate to C GPSTDG Trips LaredoE csv and select this file The rest of this section describes the procedures for performing some aggregation queries and also discusses the output results 42 GPS TDG v1 0 User s Manual Overall Average Measures To compute the averages over the entire derived trip file simply click the Execute Query button without selecting any of the check boxed under the Aggregate By and Select By Sections of the Query Pane The output is one row of measures as shown in figure below GPS Travel Diary CER Tools Help p Count Average Trip Length Average Trip Duration Average Trip Speed Basic Enhanced Query 84 3 54341460397032 502 488095238095 28 9806142857143 Query Options Select Trip File NE User Defined Aggregate By By starting Taz By ending Taz By startActivity By endActivity User Defined P

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