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cgshapeinfo.pro
Utilities
The purpose of this program is allow the user to browse a very narrow selection of shapefiles. Namely, those containing geographical shapes in latitude and longitude coordinates. In other words, shapefiles containing maps. File attributes are listed in the left-hand list widget. Clicking on a file attribute, will list all the entity attributes for that file attribute in the right-hand list. Clicking an entity attribute with list the type of entity, and the X and Y bounds of that entity (shown as LON and LAT, respectively), in the statusbar at the bottom of the display.
Knowing the attribute and entity names of a shapefile will give you insight into how to read and display the information in the file. For examples, see the Coyote Library program cgDrawShapes.
Examples
To learn about and draw the states.shp file in the IDL examples directory:
filename = Filepath(SubDir=['examples','data'], 'states.shp')
cgShapeInfo, filename, XRANGE=xr, YRANGE=yr
cgPlot, xr, yr, /NoData, XStyle=1, YStyle=1
cgDrawShapes, filename
Author information
- Author
FANNING SOFTWARE CONSULTING:
David W. Fanning 1645 Sheely Drive Fort Collins, CO 80526 USA Phone: 970-221-0438 E-mail: david@idlcoyote.com Coyote's Guide to IDL Programming: http://www.idlcoyote.com- Copyright
Copyright (c) 2006-2013, Fanning Software Consulting, Inc.
- History
Modification History:
Written by David W. Fanning, 21 October 2006. Slight modifications to the interface. 14 May 2010. DWF. Added XRANGE and YRANGE output keywords. 15 May 2010. DWF. Renamed cgShapeFile from Shapefile. 20 Aug 2012. DWF. Modified so that when the user selects a new Attribute Name, the Attribue Value index stays the same. 24 Nov 2013. DWF. Fixed a type with a progress bar. 26 March 2014. DWF.
Routines
cgShapeInfo_Events, eventThe event handler for the program.
cgShapeInfo_Cleanup, tlbThe clean-up routine for the program.
cgShapeInfo [, filename] [, XRANGE=float] [, YRANGE=float]The calling program for learning more about the contents of the shapefile.
Routine details
top cgShapeInfo_Events
cgShapeInfo_Events, event
The event handler for the program.
Parameters
- event in required type=struct
The event structure passed by the window manager.
top cgShapeInfo_Cleanup
cgShapeInfo_Cleanup, tlb
The clean-up routine for the program.
Parameters
- tlb in required type=long
The identifier of the widget that just died.
top cgShapeInfo
cgShapeInfo [, filename] [, XRANGE=float] [, YRANGE=float]
The calling program for learning more about the contents of the shapefile.
Parameters
- filename in optional type=string
The name of the shapefile you wish to browse. If not provided, the user will be asked to select a shapefile.
Keywords
- XRANGE out optional type=float
The X range of the shapefile contents in the native units of the shapefile.
- YRANGE out optional type=float
The Y range of the shapefile contents in the native units of the shapefile.
File attributes
| Modification date: | Fri Mar 27 11:07:38 2015 |
| Lines: | 361 |
| Docformat: | rst rst |