User's Manual for Thuban 1.0 - Previous Directory
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1. Add Very short Move 0 73821 1968 Medium J 1 1958 1 5954 Move Down 11 59547 994 Very long Edit Symbol Remove Tm Revert Close The order of groups in classification is significant except for the DEFAULT group which remains at the top When shapes are matched against groups the matching begins at the first group after the DEFAULT group so that groups higher in the list will be checked first Matching for a given shape will stop at the first group that matches The user can use Move Up and Move Down to change the order of the groups The DEFAULT group will always match a shape that hasn t matched another group 5 1 1 Visible The Visible column has check boxes that determine whether a classification group will be displayed in the legend This is useful if the user knows that the groups completely cover the data set and don t want the DEFAULT group to be displayed in the legend and on a printout 5 1 2 Symbols Each type of shape has its own type of symbol Thuban supports three types of shapes polygons lines and points Polygons and points have outline and fill color while lines have only line color Each group has associated symbol properties To edit the symbol properties for a group the user can double click on the Symbol column or select a group and click the Edit Symbol button 12 Chapter 5 Layer Classifications 5 1 3 Value2. iic deme d gu oh ed de bei E eet tec etes 20 7 9 Attubute Tables 5 irent rit RE rede reet rure ree A REA 21 VES PRIME EN 21 4 59 22 Joi Tables tota et oot ete eb ERE 21 1 33 Unjom Table ni RR SAA e peii ena iri hash ier ie Oden 21 8 Trouble Shooting M 23 Supported Data Source RARRRRRR 25 Supported Projection sccscscssssssssesesossosvesssssssssessocsscssessenssessoseessesconssenssesecssesseesosesossessscssesseasonesessosses 26 iii List of Figures 1 1 2 1 4 1 4 2 5 1 5 2 5 3 5 4 5 5 5 6 6 1 7 1 7 2 8 1 Window d tea e e e panne urn 2 Session INTO TLE Unete 4 Properties Window 4 rep 8 Properties WindOW e e o ete haa e ren c cipes 9 Properties WIndOW iA oe AR eR I aime 11 Generate Classics te Buchel BE OS etn eh Se he 13 Custom Color Sch mie EINE 14 Unique Values EE 14 Uniform Distribution nates 15 AEN RE ONERE BIN REGINE 16 Projection WIN OW ss EE ERO ED EE UTER EXTERN 17 ade oai iem EE EO I hee can Ass 19 Join Tables etes doneepSue dtes 21 Dialog 23 Chapter 1 Introduction Thuban is an interactive geographic data viewer It has been developed because there was no simple int
3. PySQLite 0 4 3 http pysqlite sourceforge net Along with the source codes the download page also offers full installation packages for Debian Windows and RPM based systems Mandrake RedHat SuSE etc Chapter 1 Introduction 1 2 The Main Window Figure 1 1 The Main Window lolx File Map Layer Table Help e EE amp Cultural Landmarks DEFAULT 8 27 Roads Md DEFAULT ie DEFAULT 27 celand Image 4 e k Window 768925 5685 7080470 674 Status Bar The map window shows the current state of the map and is where the user can interact with the map using the tools The legend on the left displays a list of the current layers and any visible classification groups In the example each shape layer has a default classification which specifies how the shapes in each layer are drawn Layers that are higher in the list appear closer to the user The legend can be closed by clicking on the small X in the upper right hand region of the legend To open it again use Map Legend The legend is also dockable which means that it can be detached from the main window by clicking on the small button next to the close button It can be attached by clicking the same button again The status bar displays different information depending on the current context If the user is selecting an item from the menu then the status bar will display a short help message indicating what each menu item is
4. The Value column of the classification table is the value that will be matched when the map is being drawn The type of data that can entered into this field depends on the type of data of the classification field If the field is of type Text anything entered into the field is valid The text will be compared literally to the value of the shape attribute including case sensitivity If the type is Integer then any valid integer may be entered In addition with special syntax a range of values can be entered A range from start to end inclusive is specified like this start end The exclusive range is specified like this start end Ranges can include infinity like this 00 oo Field types can also be of type Decimal They represent any rational number and can be used in ranges as well 5 1 4 Label By default the text that is displayed for a group in the legend is the value for that group The label can substitute a more descriptive term in the legend 5 2 Generating Classes Figure 5 2 Generate Class Generate Classification xj Field LENGTH Data Type Decimal Generate Quantiles from T able Unique Values Uniform Distribution from T able Number of Classes i p Color Scheme Grey Ramp v Creating a classification by hand can be tedious Thuban therefore provides a means of generating an entire classification at once while still giving the user control over how it appear
5. Layer Management 4 4 Duplication Layers and all their properties including classifications can be duplicated using Layer Duplicate Duplicating a layer is useful if the user wishes to model a layer in several different ways Even though the layers overlap by carefully selecting the shape properties it is possible to display several pieces of information at once For example one copy of a roads layer may be classified on a length property and another copy may be classified on a type property If the length property was expressed with color and the type property expressed with line thickness then it would be possible to view both classifications by placing the type property copy over the length property copy 10 Chapter 5 Layer Classifications A layer classification is a way of assigning drawing properties to groups of shapes based on attributes stored in the layer s table Only layer s with shapes can have a classification image layers cannot be classified A classification consists of a number of groups each group having a value or range of values to match against and symbol properties which control how a shape is drawn on the map The user selects which field in the table 15 used by the classification and when the map is drawn the value for that field for each shape is compared with each group s value The properties of the first group to match are used to draw the shape This allows the user to get a visual impression of not only
6. by specifying five groups Thuban will generate five groups with appropriate ranges such that 2096 of the table data is in each group If it is impossible to generate exact groupings Thuban will issue a warning but allow the user to continue Figure 5 6 Quantiles m p 0013 994 16 Chapter 6 Projection Management Projections control how the geographic data is displayed on the screen If multiple layers are loaded into Thuban where the geographic data is in a different projection system then the user must specify a projection for each layer The user must also tell Thuban which projection the map is in This can be the same as the layers or a different projection in which case the layers are reprojected into that space The map projection can be set using Map Projection and the layer projection can be set using Layer o Projection Figure 6 1 Projection Window 815 Available Projections Edit None Nm Name UTM Zone 27 vem Belgian Datum 1972 AS Gauss Boaga Zone 1 Italy Projection Universal Transverse Mercator gt Add to List Gauss Krueger Zone 2 Germany Ellipsoid Clarke 1866 Reseau Geodesique Francaise Update UK National Grid Remove Zone 27 pr Propose Southern Hemisphere Projection File defaults proj Ty Revert OK Close Thuban is distributed with a sample collection of projections The user can create new
7. dialog which displays the table attributes for that object An attribute can be selected to be the label on the map The label will be placed at the center of the shape Clicking on an object that already has a label will remove the label 3 5 The Legend 8 27 Cultural Landmarks DEFAULT B Roads DEFAULT DEFAULT amp celand Image Chapter 3 Map Management The Legend provides an overview of the layers in the map Layers that appear higher in the legend will appear closer to the user If a layer supports classification currently only shape layers have this feature then the classification groups will be shown below each layer The properties for each group are also displayed with a small graphic Polygon layers appear as rectangles lines appear as curved lines and points appear as circles Along the top of the legend is a toolbar which allows quick access to some of the layer manipulation options under Map gt The Move Layer to Top tool raises selected layer to top of xj The Move Layer Up tool raises the selected layer one level The Move Layer Down tool lowers selected layer one level The Move Layer to Bottom tool 8 lowers selected layer to bottom of map The Visible tool shows the selected layer in the map if it was hidden The Invisible tool hides the selected layer in the map o d The Properties tool opens layer s properties dial
8. different name or overwrite the existing file Chapter 2 Session Management 2 4 The Session Info Tree Figure 2 1 Session Info Tree Session nu Session Thuban sample session Filename D scygwinshome userkbuildT huban 0 Sthuban D sample raster thuban Unmodified Map Iceland map Extent lat lon 24 5496 63 2823 13 4914 66 5656 Extent projected 322003 7 0217 7e 006 876022 7 4028e 006 Projection proj utm zone 27 ellps clrk66 Layer cultural_landmark point Filename D cygwinhomeSusersbuild T huban 0 8 thuban D ata iceland cultural_landmark point shp Shown Shapes 34 Extent lat lon 23 8056 63 4049 15 1227 66 3646 Shapetype Point Projection proj latlong to_meter 0 01 7453 ellps clrk66 Classification DEFAULT B Line Color 0 000 0 000 0 000 o Line Width 1 60 Fill 1 000 1 000 0 000 Layer roads line Layer political Layer Iceland Image The session info tree is primarily intended for developers working with Thuban It displays many of the internal values for the session map and layers It can be opened from File Session Tree Chapter 3 Map Management The map consists of a number of layers where each layer represents a different type of data set By interacting with the map the user can visually explore the data The map can have a name that will appear in the Thuban title bar The map name can be changed using Map Rena
9. file GeoTIFF files work very well with Thuban and were designed specifically to be image layers in GIS programs actions in the Layer menu act on the currently selected layer in the legend 4 2 Properties To view the properties for a layer it must first be selected in the legend The menu option Layer Properties opens a dialog that displays layer s properties layers have a title which can be modified in the text field provided The type of layer is also shows If the type is a type of shape polygon arc point the classification table will be shown Image layers have no other properties other than title and type Chapter 4 Layer Management Figure 4 1 Properties Window Li ox Title Roads Type Classification Field LENGTH x Data Type Decimal Generate Class Add Move Down Edit Symbol Visible Remove Try Revert Close Figure 4 2 Properties Window Layer Properties Iceland Image o o x Title Iceland Image Type Image Tm Revert OK Close 4 3 Visibility Sometimes it is not desirable to view all layers at the same time Some layers may take a long time to draw and so while navigating around the map the user may not want to wait for the map to redraw all the layers each time the map is changed Each layer can be independently turned on or off using the Layer Show or Layer Hide options respectively Chapter 4
10. tool 2 shrinks map so that a larger region is visible A single click reduces magnification by a factor of two Clicking and dragging selects a box such that the current contents of the window will be scaled to fit into that box Chapter 3 Map Management The Pan tool Ed allows the user to move the map around by clicking and dragging Teal The Full Extent tool 2 4 rescales the viewable region so that the entire map is visible The Full Layer Extent tool K rescales the viewable region so that the currently selected layer fits within the window If no layer is selected this button will be disabled The Full Shape Extent tool rescales viewable region so that currently selected shape fits within the window If the shape is a point it is centered and the map is zoomed all the way in If no shape is selected this button will be disabled This feature is especially helpful when identifying an object related to a selected record in a tableview see below 3 3 Object Identification 2 Objects on the map can be identified using the Identify tool x Clicking on an object selects that object and opens a dialog which shows all the table attributes for that object Any current selection is lost Objects on the map are typically shapes and this document will often refer to objects as shapes 3 4 Object Labeling Objects can be labeled using the Label tool N Clicking on an object selects that object and opens a
11. xe EE BOR 8 4 2 Properties REESE UAE NER ER RU Dt Ua bea 8 4 3 51 eee eT Rd edi ane ue re e D ne pi ede Ene 9 4 4 Duplication tI Eee e oec to ie o ed tee eic i Hee s 9 5 Layer SS 11 2 1 Editing Classi Caton o eoe ecce e Hen e ede e tote e ae shooters 11 51 1 Visible ueni anum ub eas 12 3 12 Symbols x ae Hg Reed tere eeu e rette Vati deste 12 2 1 3 Value enheo et REOR YU 12 SN dp 13 3 2 Generating Classes eo eere i ea ek hey Sheen a ee rero Ra iret 13 6 Projection Management 17 6 1 5 Projection sorene tiar epe Puer wn enti oa 17 6 2 Editing Projection iei eget ERE Deb PEE e EEEE IU 17 6 3 Importing Exporting Projections eene ene enne neenneenrenen nennen nennen enne nen nenne 18 7 Table 19 PEOR M M 19 7 2 General Functionality Menu enet enne ennt enne ens 20 pum M 20 DDD Cl086 conr RA EH RR 20 20 7 24 ipe o Uu re rt URS 20 7 25
12. User s Manual for Thuban 1 0 Jonathan Coles Jan Oliver Wagner Frank Koormann User s Manual for Thuban 1 0 by Jonathan Coles Jan Oliver Wagner and Frank Koormann Copyright O 2003 Intevation GmbH Revision History Revision 1 0 1 08 Aug 2003 Corresponds to Thuban development release 0 8 1 Table of Contents enn 1 1 15 Installation aee a E a b RP ER E Pin rt RETE 1 1 2 The Main 1 2 Session rn 3 2 1 Starting a New SessIOn cet ee pero aee ee E erigens 3 2 2 Opening SESSION sss idees enel og e epa eie ni orem ete thes 3 2 3 Saving a SESSIOD ici ette ete AER EE t E te edi epi eee eae Seeded apa eodein 3 2 4 THE Session Info Treen e rtt D P 3 DO 5 3 1 Adding and Removing 5 3 2 NavigatiODu oe ee neo Au tle ed a dete ot I e e e e eot fd t 5 3 3 Object Identification E E A i dea D sees 6 3 4 Object Labeling eni eed A E E R ESNS tests 6 35 PNG DO SENG PE EEEE E ESS AE EEE SEE EAAS eee Rae 6 936 qu AEE ET ETE gaya sg E TEEDE E EO NE EET EEE EEEE EEEE ETETE 7 Bohs PRIMUS sates he hs e EEEN on Ih EEA E A eem EEE 7 J n 8 4 1 LY pesto aay ers esi ote Rete eerte I e A t
13. c projection they differ especially in their parameterization Belgium Datum 1972 Lambert Conic Conformal Gauss Boaga Zone 1 Italy Transverse Mercartor Gauss Krueger Zone 2 Germany Transverse Mercartor Reseau Geodesique Francaise France Lambert Conic Conformal 26 Appendix B Supported Projections UK National Grid United Kingdom Transverse Mercartor Thuban uses the comprehensive PROJ library for projections PROJ provides more than the four commonly used projections described above If needed Thuban can be easily extended to a new projection covered by PROJ 27
14. e used with Thuban please see the Technical Specification for the Shapefile format above Raster files Binding the GDAL library Thuban supports numerous raster file formats see GDAL format list http www remotesensing org gdal formats list html for details Most commonly used is the TIFF GeoTIFF format Raster maps are provided as TIFF images with an additional world file storing the geographic reference usually with an extension tfw 25 Appendix Supported Projections The following types of projections are directly support by Thuban The specific values for each are provided by the user to create custom projections Thuban comes with predefined projections which are available through the Projections dialog Geographic Ellipsoid Source Data either Degrees or Radians Lambert Conic Conformal Ellipsoid Latitude of 1st standard parallel Latitude of 2nd standard parallel Central Meridian Latitude of Origin False Easting meters False Northing meters Transverse Mercator Ellipsoid Latitudeof origin Longitudeat central meridian Scale Factorat central meridian False Easting meters False Northing meters Universal Transverse Mercator Ellipsoid Zone can be guessed appling the Propose button Southern Hemisphere flag Thuban comes with a sample set of map projections for various European countries Apart from the basi
15. ents the Table View The view has five sections The title selections the table grid export functions and the status bar The title bar identifies the table with its name The selections box let the user perform simple analysis on the data based on comparisons The first choice must be a field identifier of the table the second choice determines the type of comparison The third choice can be either a specific value interpreted as numerical or string depending on the type of the first field or a second field identifier Thus you can perform analysis like selecting all records where population gt 10000 or cars per inhabitant bikes per inhabitant note that the field names are only explanatory the dBase files allow only 11 character field names Selections can be combined either by applying a selection only on a previously selected set of records or by adding the results of a selection to a previous set The default is that a selection replaces earlier results 19 Chapter 7 Table Management The table grid shows the contents of the table one record per row with highlighted selection results Columns and rows can be resized The contents of a table can be exported into a file either dBase format DBF or comma separated values CSV The Export button raises a file dialog to specify a path and file name the export type is determined by the file extension either dbf or csv The Export Selection button works similarly but expor
16. eractive viewer for geographic information available as Free Software Thuban is written in Python and and uses the wxWindows library allowing it to run on many different platforms including GNU Linux and Windows Geographic data viewers are a necessary tool as they allow one to get a visual impression of the positional relationship of the information that may not be apparent from simple inspection of the data values themselves Thuban allows the user to create a session that displays geographic data and then explore that data through navigation and manipulation of how it is drawn The results can then be saved or printed Thuban arranges a session in a hierarchy A session contains a map which consists of layers Each layer represents one kind of data set For instance there may be a layer for roads and another layer for buildings These layers can either be vector shapes or images 1 1 Installation Thuban is actively supported under Debian Testing sarge RedHat 7 2 and Windows 2000 Thuban depends on the following packages These packages can also be found on the Thuban Download site http thuban intevation org download html Python 2 2 1 http www python org wx Windows 2 4 http www wxwindows org wxPython 2 4 http www wxpython org proj 4 4 5 Projection Library http www remotesensing org proj GDAL 1 1 8 http www remotesensing org gdal SQLite 2 8 3 http www hwaci com sw sqlite
17. for If the user has a tool selected then the position of the cursor on the map is displayed The tool bar provides quick access to the commonly needed tools By hovering over each button the user can see a short messages describing what the tool does The tools provided are Zoom In Zoom Out Pan Full Extent Full Layer Extent Full Shape Extent Identify and Label Each of the tools will be explained in further detail later in the manual Chapter 2 Session Management 2 1 Starting a New Session A new session can be started from File New Session If a session is already loaded and has been modified without being saved a prompt will ask if the current session should be saved A new session consists of an empty map with no layers and no tables 2 2 Opening a Session A session can be opened from File Open Session A dialog box will open allowing the user to browse for a Thuban Session file Thuban session files end with thuban Selecting a file a clicking OK will load the session into Thuban If a session is already loaded and has been modified without being saved a prompt will ask if the current session should be saved 2 3 Saving a Session A session can be saved from File Save Session A dialog box will open allowing the user to browse the file system and select a place to save the session Thuban sessions should be saved under name ending in If the file already exists the user will be prompted to save under a
18. hange lt Change ome The Unique Values option lets user select specific values that appear in table Clicking Retrieve From Table searches the table for all unique values and displays them in the list on the left Items can be selected and moved to the list on the right Each list can be sorted or reversed for easier searching The classification that is generated will be in the same order as the list on the right 14 Figure 5 4 Unique Values Generate Classification Field CLPTLABEL Data Type Text Generate Unique Values Y Retrieve From Table Available Use HUT LIGHTHOUSE BUILDING RUINS FARM OTHERJUNKNOWN 4 gt 4 Sort Reverse K Sort Reverse Color Scheme Grey Ramp Fix Border Color Change Chapter 5 Layer Classifications The Uniform Distribution option creates a user specified number of groups of ranges such that each range covers equal intervals The minimum and maximum values can automatically be retrieved from the table by clicking Retrieve From Table The stepping is how large each interval is Adjusting this value will automatically recalculate how many groups is appropriate 15 Chapter 5 Layer Classifications Figure 5 5 Uniform Distribution Generate Classification ite Uniform Distribution The Quantiles option generates ranges based on the number of items in the table For example
19. how the data is laid out but also what kind of data lies where A layer always has a classification When a new layer is added to the map a default classification is created with the DEFAULT group This group cannot be removed but can be hidden see below Every shape in the layer regardless of its attributes will match this group if no other group matches 5 1 Editing Classifications A layer s classification can be modified under the properties dialog Layer Properties The layer s classification field can be set to None which simply assigns a DEFAULT group to the classification No new groups can be added to the classification if the field is None The user must first select a field to classify on New groups can be added to the classification with the Add button To apply the changes to the map the user can click either Try or OK Try will not close the dialog box allowing the user to see how the classification changes the map Revert will undo the last classification applied to the map OK will commit the changes and close the dialog The user will be unable to undo the changes Close simply closes the dialog box If any changes have not been applied with Try the changes will not be applied to the map Il Chapter 5 Layer Classifications Figure 5 1 Properties Window Layer Properties Roads EU ni x Title Roads Type Classification Field LENGTH Data Type Decimal Generate Class
20. me I x Map Title Iceland map Cancel 3 1 Adding and Removing Layers There are two types of layers that can be added to a map shape layers and image layers Shape layers are stored in Shapefile format a standard file format for storing geographic objects These files have the extension shp Associated with the shape file is a database file which stores attributes for each shape in the shape file This file in dBase format has the extension dbf Both files must have the same base name For example if there is a shape file named roads shp there must also be a file roads dbf Shape layers can be added to the map with Map Add Layer Thuban will load all files with the same base name so it doesn t matter if the shape file or database file is selected Image layers can be added to the map with Map Add Image Layer It is important to select a valid image file that has geographic data associated with it The data can be embedded in the file itself or in another file If geographic information cannot be found Thuban will report an error 3 2 Navigation The map can be explored by using the navigation tools available on the tool bar or from the Map menu The ZoomIn tool A enlarges a region of the map Clicking once on the map will double the magnification and center the map on the point that was clicked Clicking and dragging selects a region that will be enlarged to fit the window The ZoomOut
21. og box Double clicking on a layer or a group of a layer will open the properties dialog for that layer Along the bottom of the legend is the scalebar The scalebar will be available if there are any layers and the map has a projection set 3 6 Exporting Under Windows maps can be exported in Enhanced Metafile format wmf from Map Export for use in reports presentations or further modification The current map view legend and if available scalebar are exported Under other platforms this option is not available Clicking this menu item open a file selection dialog that lets the user select a location to export the map 3 7 Printing The map can be printed using Map Print The current map view legend and if available scalebar printed A standard printing dialog will open allowing the user to configure the printer This dialog will differ depending on which platform Thuban is running Chapter 4 Layer Management 4 1 Types of Layers There are two types of layers supported by Thuban shape layers and image layers Shape layers consist of vector based shapes with geo referenced coordinates There are three types of supported shapes polygons lines arc and points Image layers can be any image file format supported by the Geo spatial Data Abstraction Library GDAL The images must have geographic coordinate data either embedded within the file or in a separate file that is in the same directory as the image
22. ose simply closes the dialog box If no selection has been applied with Try the selection will not be applied to the map 6 3 Importing Exporting Projections The projections that appear in the list of available projections can be exported to another file that the user chooses By selecting one or more projections and clicking Export the user will be able to select a file in which to store those projections The file can then be distributed to other Thuban users To import a projection file the user can click Import The imported projections are added to the list and are then available to the current session and any future Thuban sessions 18 Chapter 7 Table Management Thuban distinguishes two different types of tables Attribute tables which belong to a layer and normal data tables Both provide the same general functionality with the difference that actions on an attribute table might also effect the map display 7 1 Table View Figure 7 1 Table View TT Selection fenem 0 05 Replace Selection TNODE LPOLY_ RPOLY_ LENGTH RDLINE_ E 146 0156000 i 146 0 031000 4 146 0 161000 146 0 039000 146 0 121000 146 0 040000 146 0187000 146 0 110000 10 145 0 001000 Export Export Selection 839 rows 163 selected 9 columns E lt gt OLIN OO f Co NN Thuban provides a standard dialog to display table cont
23. projections and make them available to all future Thuban sessions They may also be exported and imported so that custom projections can be distributed 6 1 Selecting a Projection The available projections are listed on the left If the layer or map already has a projection it will initially be highlighted and will end with current Selecting lt None gt will cause Thuban to use the data as it appears in the source file and will not use a projection 6 2 Editing a Projection Whenever a projection is selected from the list its properties are displayed on the right These properties can be changed and the changes saved to the selected projection using Update Only a projection that comes from a file can be updated so if the current layer s projection is selected Update will be disabled Add to List adds the 17 Chapter 6 Projection Management projection to the list of available projections as a new entry and thus makes it available to future Thuban sessions Clicking New will create an entirely new empty projection The Remove button will permanently remove a projection from the list of available projections To apply the selected projection to the map the user can click either Try or OK Try will not close the dialog box allowing the user to see how the projeciton changes the map Revert will undo the last projection applied to the map OK will commit the changes and close the dialog The user will be unable to undo the changes Cl
24. r 7 Table Management 7 3 3 Unjoin Table As said above a normal table cannot be closed while it is still used in a join While the joined table resulting from a join of normal tables can be simply closed and thereby dereferencing the source tables this is not possible for attribute tables Hence joins on attribute tables must be solved explicitly This is what the Layer Unjoin Table item is used for The last join for the currently active layer is solved 22 Chapter 8 Trouble Shooting Here are a few problems that users have encountered when first using Thuban After adding two or more layers nothing is drawn in the map window This is probably because the layers have different projections Projections must be set on all layers and on the map itself if the layers projections are different Thuban crashes on startup with the error NameError global name False is not defined True and False were only introduced in Python 2 2 1 Thuban depends on at least Python 2 2 1 After compiling Thuban Thuban crashes with an error similar to ImportError usr local lib thuban Thuban Lib wxproj so undefined symbol personality v0 Thuban depends on the wxWindows library If Thuban is compiled with an incompatible version of the compiler than wxWindows was compiled with this error may occur Try compiling with a different version of the compiler If an error occurs Thuban will display a dialog indicating the er
25. ror before closing The text should be copied and reported to the Intevation bugtracker http thuban intevation org bugtracker html More information about the system is available from Help About box This should also be included in the bug report Figure 8 1 Error Dialog Thuban Internal Error E xl unhandled exception occurred please report to http thuban intevation org bugtracker html Traceback most recent call last File thuban py line 26 in Thuban UI main maint File Thuban UI main py line 26 in main app Thuban4pplication 0 File C Sws versionswisPython 2 4 0 BwsPythonSws py line 1821 init _weStart self File Thuban Ul sapplication py line 62 in Onlnit self create_session File Thuban UI application py line 190 in create session self SetSession create empty session File Thuban Modelssession py line 384 in create empty session gt OK 23 Chapter 8 Trouble Shooting 24 Appendix A Supported Data Sources Shapefile The Shapefile format has become a standard format for saving geographic vector information It supports polygons lines and points Technical Specification http www esri com library whitepapers pdfs shapefile pdf dBase file dBase files are used to store the attributes for each layer This is closely associated with the Shapefile format For detailed specifications on the correct format of a dBase fil
26. s ome The Table Join item raises a dialog to specify the two tables to be joined The join results in a new table named Join of left table and right table The dialog lets you select the two tables to be joined and the two fields the join has to be performed on By default the new table contains only those records which are matched by the join If you want to preserve the records of the left table you can perform an outer join The fields from the right table for records not matched by the join are filled with None in this case 7 3 Attribute Tables To clearly separate between both types of tables data and attribute Thuban provides functionality regarding the attribute tables under the Layer menu 7 3 1 Show Table Layer Show Table opens the attribute table of the currently active layer in a table view In addition to the functionality described above selections affect also the map display objects related to selected records are highlighted 7 3 2 Join Table Unlike the join described above the join does not result in a new table The attribute table of the currently active layer is the left table and other tables are joined to this table The results of the join are available for classification As a consequence the join cannot result in fewer records than the source attribute table The user is warned if the right table does not fulfill this constraint An outer join must be used in such cases 21 Chapte
27. s Clicking Generate Class opens the Generate Classification dialog Under the Generate pull down there are at most three different ways to generate classifications Unique Values Uniform Distribution and Quantiles Some options may not be available 13 Chapter 5 Layer Classifications if the data type for the field does not support them For instance Uniform Distribution doesn t make sense for a Text field For every way of generating a classification a color scheme must be selected Thuban provides several different color schemes that affect how the group properties change over the classification It may be desirable that only certain properties change over the classification If the shape type is a polygon or a point then the Fix Border Color option will be available This allows the user to select a border color for all classification groups It is also possible to create a custom color scheme Selecting this option will display two symbols the one of the left has the properties of the first group and the one on the right has the properties of the last group Thuban will interpolate between these two properties to generate the other groups Figure 5 3 Custom Color Scheme Generate Classification E xj Field LENGTH Data Type Decimal Generate Quantiles from T able Apply to Range rn 001 1 994 Retrieve from Table Number of Classes p Color Scheme Custom Ramp X Start End gt eren gt a C
28. ts only the selected records The Close button closes the table view window This is different from the menu item Table Close which unloads the table from Thuban The status bar displays some statistics about the table and optional selection results 7 2 General Functionality Menu Table The general functions affect all tables open in Thuban Attribute tables are considered here as normal data tables with the exception that they cannot be closed 7 2 1 Open The Table Open item raises a file dialog to let you select a dBase file from the file system to be loaded into Thuban read only On OK the selected file is loaded and a table view is opened 7 2 2 Close The Table Close item raises a dialog listing the currently open data tables loaded via Table Open Selected tables are dereferenced on confirmation Since tables are opened read only the contents of the tables are not affected Any open views of the tables are closed as well Tables used in a join cannot be closed 7 2 3 Rename Table Rename changes the table title 7 2 4 Show The Table Show item raises a list of available tables explicitly loaded attribute tables results of a join Selected tables are show in tables views on OK 20 Chapter 7 Table Management 7 2 5 Join Figure 7 2 Join Tables ET Table oads line v Table other roads Field Field RDLNTYPE Outer Join preserves left table record
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