Subsections of datasets (T21)
Contents
1. Quit In each case INTREPID displays an Open or Save As dialog box Use the directory and file selector to locate the file you require See Specifying input and output files in Introduction to INTREPID R02 for information about specifying files Vector dataset notes INTREPID obtains the X and Y data from the dataset aliases The dataset must have the following aliases identifying appropriate field files X coordinate geographic location Y coordinate geographic location See Vector dataset field aliases in INTREPID database file and data structures R05 for more information about aliases Load Vector Dataset Use this option to specify a vector dataset from which you wish to create the subsection INTREPID will open the dataset and display its traverse lines or points in the Subsection Main window Load Grid Dataset Use this option to specify a grid dataset from which you wish to be create the subsection INTREPID will open the dataset and display it in the Subsection Main window Specify Output Use this option to specify the name for the output vector or grid 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 4 Library Help Top lt 4 Back gt dataset you are creating with the subsection process Load Options If you wish to use an existing task specification file to specify the Subsection process use this option to specify the task specification file requi2. Cancel Specify the subsampling interval you require in the Subsampling Rate text box then choose OK Note Increasing the value of the Subsampling Rate parameter means increasing the interval INTREPID displays fewer data points 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 6 Library Help Top 4 Back gt INTREPID will redisplay data in the Subsection Main window using the new subsampling interval Be careful not to confuse output subsampling with display subsampling The output subsampling interval affects the data that INTREPID copies to the new dataset The display subsampling interval affects the way INTREPID displays the dataset in the Subsection tool main window See Subsampling for the output dataset for more information about output subsampling Subsection process display example Here is an example of a Subsection line dataset display The first illustration shows part of the original dataset display with a polygon specified as the subsection criterion The second illustration shows the new dataset created from the data that was within the polygon Specifying the Subsection criteria There are three ways of specifying the criteria for extracting the subsection You can use the methods singly or in combination e Specifying a geographic region for the subsection using one of the following methods A rectangle defined by its centroid size and orientatio
3. Centroid Easting Northing Use these text boxes to specify the coordinates of the centroid of the rectangle using the rectangle s distance units SeeSpecifying the projection and datum of a rectangle Dimensions X Direction Y Direction Use these text boxes to specify the dimensions of the rectangle using the rectangle s distance units See Specifying the projection and datum of a rectangle Rotation Use this text box to specify the orientation of the rectangle The default value is 0 which orients the Y dimension see above in the North South direction The rotation 1s expressed in degrees positive 1n the clockwise direction so that for example if Rotation is 45 the Y dimension will be in the North Easterly direction Existing Polygon Datasets You can specify an existing polygon dataset to define the region for the subsection gt gt To use an existing polygon dataset 1 Choose Load Existing Polygon from the Spatial menu INTREPID displays an Open dialog box Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 10 Library Help Top 4 Back gt 2 Use the directory and file selector to locate the dataset you require See Specifying input and output files for details about specifying files INTREPID displays the outline of the polygon dataset Creating polygons on the screen You can use the mouse to trace a new polygon directly onto your dat
4. 4 Back gt gt gt To use a task specification file in an interactive Subsection session Load the task specification job file File menu Load Options modify any settings as required then choose Apply Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 16 Library Help Top q Back gt gt gt To use a task specification file for a batch mode Subsection task Type the command subset exe with the switch batch followed by the name and path if necessary of the task specification file For example if you had a task specification file called surv329 job in the current directory you would use the command subset exe batch surv329 Jjob Task specification file notes and example Library Help Top Here is an example of a Subsection task specification file using Parms format Process Begin Name subsection GRID disk1 surv mlevel_grid OUT disk1 surv mlevel A Parameters Begin Box Centroid East 740000 0 Box Centroid North 8415000 0 Box Width 2000 0 Box Height 1000 0 Box Rotation 0 0 Output_Subsampling 1 Shrink Yes SplitLines No Exclude No Box_Projection TMAMG54 Box Datum AGD66 Search Condition mlevel_grid gt 1969 Parameters End Process End A similar job file this time written using V5 0 protobuf syntax 1s shown below Example task file V5 0 protbuf syntax subset Subsection a line
5. datasets T21 12 Library Help Top lt 4 Back gt 2 Specify any logical expression involving fields in the vector dataset values in the grid dataset Use the standard INTREPID expressions notation See INTREPID expressions and functions R12 for a full description of the syntax of expressions For example if you have a field called LINE_NUMBER you could specify LINE NUMBER gt 1200 If you are testing grid values in a condition use the name of the grid itself as the field name in the expression For a multiband grid add a colon followed by the band number Examples raw_grid lt 2016 K_Th_U_grid 1 gt 1723 56 Subsampling for the output dataset Library Help Top Output subsampling works for vector datasets only If you are creating a subsection of a vector dataset you can reduce the detail in the output dataset by only including some of the data for example every 10th data point The corresponding operation on grid datasets consists essentially of increasing the size of the grid cells If you wish to perform such processes on grid datasets use the INTREPID Grid Operations tool See Grid Operations T25 for further information Be careful not to confuse output subsampling with display subsampling The output subsampling interval affects the data that INTREPID copies to the new dataset The display subsampling interval affects the way INTREPID displays the dataset in the Subsection tool main window See Spec
6. for Clipping dialog box illustrated below contains Projection and Datum command buttons and a display of the current projection and datum of the rectangle The default projection and datum is that of the input dataset gt gt To specify the projection and datum of a rectangle In the Rectangle Dimensions for Clipping dialog box choose the appropriate command button See INTREPID s supported datums and projections R09 for more information about projections Projection Use this to specify the projection of the rectangle If you choose Projection INTREPID displays the Projections dialog box Select the projection you require by clicking the name of the projection and choosing OK Datum Use this to specify the datum of the rectangle If you choose Datum INTREPID displays the Datum dialog box Select the datum you require by clicking the name of the datum and choosing OK 1 7 If the rectangle is geodetic then it may not strictly be a rectangle For simplicity we shall still refer to it as such 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 8 Library Help Top 4 Back gt Rectangle defined by corners gt gt To specify a rectangle defined by corners 1 Choose Rectangle from the Spatial menu INTREPID displays the Rectangle Dimensions for Clipping dialog box 2 Select the Corners option INTREPID displays the corresponding parameter text boxes Lower Left Corner Upper R
7. output files for details about specifying files Pass or reject data inside After you have specified spatial criteria for extracting the subsection data i e the rectangle or polygon you can specify whether the data within the rectangle or polygon will form the new dataset or be the data that is excluded from the new dataset The default option is to use the data inside the rectangle of polygon for the new dataset No matter which way you set this option INTREPID will still apply the condition and the output subsampling if specified See Conditions using an expression and Subsampling for the output dataset gt gt To exclude data within the rectangle or polygon Turn on Reject Data Inside in the Spatial menu gt gt To include data within rectangle or polygon You should only need to do this to reverse a previous Reject Data Inside setting Turn off Reject Data Inside in the Spatial menu Conditions using an expression You can use a logical expression as a criterion for extracting the Subsection You can use this alone or in conjunction with spatial criteria and or subsampling To specify a logical expression for the subsection process 1 Choose Expression from the Conditions menu INTREPID displays the Subsection Condition dialog box Subsection Condition Select data with condition OK Cancel 2012 Intrepid Geophysics 4 Back gt Library Help Top INTREPID User Manual Subsections of
8. the display for details For a large dataset that is slow to display you can also determine the display subsampling interval See Specifying the display resolution for instructions Specify the output dataset to be created with the results of the process Use Specify Output from the File menu See Specifying input and output files for detailed instructions Specify the geographic criteria for extracting the Subsection using options from the Spatial menu See Specifying the Subsection criteria for details Specify the conditional criteria for extracting the Subsection using options from the Condition menu You can use this in conjunction with Spatial criteria if required See Specifying the Subsection criteria for details Specify the options for the process whether to delete or retain nulls split lines pass or reject data inside a polygon using options from the Options menu See Subsection options for more information When you have made specifications and settings according to your requirements choose Apply INTREPID will perform the Subsection process and display the new dataset in the Subsection Main window If you wish to record the specifications for this process in a task specification job file in order to repeat a similar task later or for some other reason use Save Options from the file menu See Specifying input and output files for detailed instructions If you wish to repeat the process choose Close Dataset f
9. INTREPID User Manual Subsections of datasets T21 1 Library Help Top 4 Back gt subsections of datasets T21 Top The INTREPID Subsection tool can extract a subset of data from a dataset and save it as a new separate dataset For a practical introduction to this tool see the Guided Tour Managing INTREPID datasets G06 It can extract data lying within or outside e A rectangular geographic area defined by e Corner points or e Centroid size and orientation e An existing polygon dataset or a polygon that you trace on the screen It can also Gn combination with a geographic region if required extract data e Selected by a logical expression and or Subsampled from the original dataset You can choose whether to leave out or retain but set to null the data that is to be excluded from the new dataset If the Subsection process removes part of the data from the middle of one or more lines in a line dataset you can choose whether to convert each split line into two separate lines or to leave them as one line The Subsection tool displays the dataset graphically You can choose the degree of detail subsampling interval used in the display of a vector dataset You can save a traced polygon as a new polygon dataset for later use 1f required In this way the Subsection tool can act as a utility for creating polygon datasets The Subsection tool gt gt To use Subsection with the INTREPID graphic user interface 1 Choose S
10. aset display for use as the region for the subsection You can save this as a new polygon dataset for later use if required In this manner the Subsection tool can act as a utility for creating polygon datasets If you make an error or no longer require the traced polygon you can erase it from the display gt gt To trace a polygon on the screen 1 Choose Trace a Polygon from the Spatial menu INTREPID will enter polygon trace mode and turn on the Trace a Polygon option in the Spatial menu 2 Click each vertex of the required polygon You do not need to close the polygon i e you do not need to click the first vertex again at the end INTREPID will create a closed polygon with the vertices you specify 3 Choose Trace a Polygon from the Spatial menu again INTREPID will exit from polygon trace mode r s E Intrepid Subsection Tool Ta am File Spatial Condition Options Window Vector Display Grid Display Help Image mlevel_grid Stop Redraw Zoom In l Zoom Out Library Help Top 2012 Intrepid Geophysics 4 Back gt eee a eee Library Help Top 4 Back gt Saving a traced polygon You can create a polygon dataset defining this region gt gt To save a traced polygon 1 Choose Save Current Polygon As from the Spatial menu INTREPID displays a Save As dialog box 2 Use the directory and file selector to specify a name for the new polygon dataset See Specifying input and
11. dataset using a bounding polygon Usage fmanager batch subsection_line_polygon task IntrepidTask Subset IN datasets ebagoola_S DIR a line dataset CLIP_POLY datasets eba_polygon DIR OUT datasets ebagoola_S_subset DIR what you want to create ReportFile subsection rpt OulLput_ Subsampling 13 RectangleOption None no rectangular clipping Shrink true SplitLines false Exclude false keep the data inside the box Notes e Use IN to specify an input vector dataset 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 17 Library Help Top Library Help Top q Back gt Use GRID to specify an input grid dataset The Box_Projection and Box_Datum statements apply only to rectangles not to polygon datasets which have their own projections If you wish to use a traced polygon in a task specification file you must save it as a polygon dataset using Save Current Polygon As from the Spatial menu 2012 Intrepid Geophysics 4 Back gt
12. ed this process to zoom in INTREPID will immediately zoom out to the full dataset display 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 5 Library Help Top 4 Back gt To pan the display view different parts When you have zoomed in the Pan Zoom indicator in the Command area consists of a small square within a larger square The large square represents the whole display and the small square the part visible on the screen When you drag the small square to a different part of the large square INTREPID shows the corresponding part of the display Fa m Intrepid Subsection Tool Tam So File Spatial Condition Options Window Vector Display Grid Display Help Image mlevel_grid Stop Redraw Zoom In Zoom Out If you are viewing the whole display the small square may occupy the whole of the large square Specifying the display resolution Library Help Top This section applies only to vector datasets If you are processing a large vector dataset INTREPID may take some time to display the data It normally displays every 10th data point the display subsampling interval To speed up the data display on the screen decrease the subsampling interval To modify the display subsampling interval choose Display Subsampling from the Options menu INTREPID displays the Subsampling for Display dialog box Subsampling for Display subsampling Rate OK
13. everse a previous Retain Nulls setting Choose Delete Nulls from the Options menu INTREPID will place a check mark against this option This section applies only to line datasets If the Subsection process removes part of the data from the middle of one or more lines in a line dataset you can choose whether to convert the separated line segments into separate lines or to leave them as a single line If you leave the split line as a single line there may be a large difference in Z values on either side of the gap This could cause time consuming unnecessary and irrelevant smoothing activity in several INTREPID tools If the two line sections become two separate lines these problems are avoided If you split the lines all lines retain the original line number The default option is for INTREPID to leave the data as a single line gt gt To specify that lines should be split Turn on the Split Lines option in the Options menu gt gt To specify that lines should not be split Turn off the Split Lines option in the Options menu 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 14 Library Help Top 4 Back gt Apply When you choose Apply INTREPID performs the subsection operation Help You can use the Help menu to display help text on the topics shown in the menu illustration below m Intrepid Subsection Tool oo Lc eS File Spatial Condition Options Window Vector D
14. ifying the display resolution for information about display subsampling gt gt To specify a subsampling interval for an output vector dataset 1 Choose Output Subsampling from the Condition menu INTREPID displays the Dataset Output Subsampling dialog box Dataset Output S ubsampling Subsample Rate i 2 Specify the subsampling interval in data points in the corresponding Subsample Rate text box For example if you specify 5 then INTREPID will copy every 5th data point to the output dataset Note Increasing the value of the Subsample Rate parameter means increasing the interval INTREPID displays fewer data points 3 Choose OK 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 13 Library Help Top 4 Back gt Subsection options Deleting or retaining nulls Splitting lines Library Help Top You can choose whether you wish INTREPID to omit the excluded data from the new dataset or retain it but set all values to null INTREPID will normally omit the excluded data gt gt To retain the excluded data but set all of its Z values set to null Choose Retain Nulls from the Options menu Intrepid Subsection Tool Delete Nulls Retain Nulle Split Lines Display Data on Load Display Sampling Select Columns INTREPID will place a check mark against this option gt gt To omit the excluded data You should only need to do this to r
15. ight Corner Easting Easting Northing Northing Projection THAMG54 Datum AGD 66 OK Cancel Specify the parameters then choose OK Lower Left Corner Easting Northing Use these text boxes to specify the location coordinates of the lower left corner of the rectangle using the rectangle s distance units See Specifying the projection and datum of a rectangle Upper Right Corner Easting Northing Use these text boxes to specify the location coordinates of the upper right corner of the rectangle using the rectangle s distance units See Specifying the projection and datum of a rectangle Rectangle defined by centroid size and orientation gt gt To specify a rectangle defined by centroid size and orientation 1 Choose Rectangle from the Spatial menu INTREPID displays the Rectangle Dimensions for Clipping dialog box Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 9 Library Help Top lt 4 Back gt 2 Select the Centroid Dimensions option INTREPID displays the corresponding parameter text boxes Rectangle Dimensions for Clipping peci Borctana T fh J lo Rar C Corners Centroid Dimensions Centroid Dimension Easting 0 0000 Direction 0 0000 Northing 0 0000 Y Direction 0 0000 Rotation 0 0000 Projection THAMG54 ___Datum__ AGD66 OK Cancel Specify the parameters then choose OK
16. isplay Grid Display Subsection PDF INTREPID Contents PDF INTREPID Search PDF Website Library Subsection Exit gt gt To exit from Subsection Choose Quit from the file menu Displaying options and using task specification files Displaying options To display the current file specifications and parameter settings choose Report from the Window menu om Intrepid Subsection Tool ie s File Spatial Condition Options Vector Display Grid INTREPID displays the Subsection Report window containing the task specifications Using task specification files You can store sets of file specifications and parameter settings for Subsection in task specification job files Also at V5 0 the protobuf option is delivered in the form of task files gt gt To create a task specification file with the Subsection tool 1 Specify all files and parameters 2 If possible execute the task choose Apply to ensure that it will work 3 Choose Save Options from the File menu Specify a task specification file INTREPID will add the extension job INTREPID will create the file with the settings current at the time of the Save Options operation For full instructions on creating and editing task specification files see INTREPID task specification job files RO6 Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 15 Library Help Top
17. n A rectangle defined by a pair of diagonally opposite corners e A polygon that you trace on the screen An existing polygon dataset e Specifying a condition a logical expression defining criteria for including values in the output dataset e Specifying a subsampling interval for the output dataset Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 7 Library Help Top Rectangles Library Help Top q Back gt gt gt To specify a rectangle or polygon Choose the corresponding option from the Spatial menu File Condition Options Window Rectangle Trace a Polygon Load Existing Polygon Save Current Polygon As Erase Traced Polygon Reject Data Inside gt gt To specify a condition Choose Expression from the Condition menu File Spatial Condition Options Window Vecta Expression Output Subsampling gt gt To specify an output subsampling interval Choose Output Subsampling from the Condition menu You can define a rectangular geographic region for the subsection process It can be defined in terms of centroid size and orientation or a pair of opposite corners and can have any projection If it has a different projection from the input dataset INTREPID will automatically convert it before the subsection process Specifying the projection and datum of a rectangle The Rectangle Dimensions
18. red INTREPID will load the file and use its contents to set all of the parameters for the Subsection process See Displaying options and using task specification files for more information Save Options If you wish to save the current Subsection file specifications and parameter settings as an task specification file use this option to specify the filename and save the file See Displaying options and using task specification files for more information The Subsection tool display Zooming and panning the display Library Help Top You can enlarge and reduce the display zoom in and out and view different parts of it pan gt gt To zoom in and out enlarge reduce by steps To zoom in enlarge the display choose Zoom In from the Command area Each time you choose this button INTREPID will enlarge the display by 25 To zoom out reduce the display choose Zoom Out from the Command area Each time you choose this button INTREPID will reduce the display by 25 gt gt To zoom in on a Selected area of the display 1 Ensure that you are not currently tracing a polygon Check that the Trace a Polygon option in the Spatial menu is turned off See Creating polygons on the screen for details 2 Hold down the left mouse button and drag diagonally corner to corner across the area that you wish to enlarge INTREPID will enlarge the selected region to fill the display area of the window If you choose Zoom Out having us
19. rom the File menu then repeat steps 2 9 varying the parameters and or data files as required 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 3 Library Help Top lt 4 Back gt 11 To exit from Subsection choose Quit from the File menu To view the current set of specifications choose Report from the Window menu INTREPID displays the Subsection Report window See Displaying options and using task specification files for details and an example of a set of specifications During the Subsection process INTREPID displays messages in the Status section of the Command area in the Subsection Main window These messages indicate INTREPID s current activity You can view Help information by choosing options from the Help menu See Help below You can execute Subsection as a batch task using a task specification Job file that you have previously prepared SeeDisplaying options and using task specification files for details Specifying input and output files Library Help Top To use Subsection you will need to specify the vector or grid dataset from which you wish to extract the subsection and the name of the new subsection dataset Choose the options as required from the File menu FJ Intrepid Subsection Tool A Spatial Condition Options Wi Load Vector Dataset Load Grid Dataset Specify Output Specify Report Load Options Save Options
20. ubsection from the File menu in the Project Manager or use the command subset exe INTREPID displays the Subsection Main window 2 Ifyou have previously prepared file specifications and parameter settings for Subsection load the corresponding task specification file using Load Options from the File menu See Specifying input and output files for detailed instructions If all of the specifications are correct 1n this file go to step 8 If you wish to modify any settings carry out the following steps as required Library Help Top 2012 Intrepid Geophysics 4 Back gt INTREPID User Manual Subsections of datasets T21 2 Library Help Top Library Help Top 3 q Back gt Specify the dataset from which you wish to extract the Subsection Use Load Vector Dataset or Load Grid Dataset from the File menu See Specifying input and output files for detailed instructions INTREPID displays the dataset in the Subsection Main window 10 z E Intrepid Subsection Tool h T al a FI Intrepid Subsection Tool oo File Spatial Condition Options Window Vector Display Grid Display Help Lines Image ebagoola_S mlevel_grid Apply Stop Redraw Stop Redraw Zoom In Zoom In Zoom Out Zoom Out While preparing for the Subsection process or afterwards you can zoom enlarge an area of the display and pan examine different regions while enlarged See Zooming and panning
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