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Scripting in ArcGIS PDF

pages57 Pages
release year2013
file size0.91 MB
languageEnglish

Preview Scripting in ArcGIS

GIS 4653/5653: Spatial Programming and GIS Automating GIS tasks in ArcGIS Interactive Geoprocessing Automating GIS tasks in ArcGIS  Many of the interactive operations in the ArcGIS GUI are merely front-ends to geoprocessing tools  Can invoke these tools directly without going through the ArcMap graphical interface  Two ways to invoke geoprocessing tools  Model Builder  Python scripts Geoprocessing tools  The basic geoprocessing tools are available directly  Many more are in the ArcToolbox and can be found by Search Interactive use with the dialog  Let us take the example of dissolving the congressional boundaries to create a state boundary file of Oklahoma  Geoprocessing | Dissolve | Fill dialog box  To avoid errors, choose input feature from display layers Environment options  When carrying out geoprocessing operations, it is good to change a couple of ArcMap environment settings  Specify the current workspace explicitly  Geoprocessing | Environments | First option  Either the location of your script or the location of your data  Allow scripts to overwrite earlier outputs  Changes from being an error to merely a warning  Geoprocessing | Geoprocessing Options | First check box Hierarchy of Environment Settings  The most specific over-rides the more general  From most general to most specific:  ArcMap  Individual tool  Click on “Environments” on the dialog box to change  Model  Environment settings that are part of the model properties  Python scripts can set environment variables Batch processing  Can use ArcMap interactively if the same tool needs to be applied to many datasets  To bring up the batch window, right-click on the tool name in the Catalog window  Which toolbox is “Dissolve” in? Use Search to find tool Batch window for Dissolve  Specify a set of parameters  Use copy-paste from one line to the next  Can also drag and drop features from active map  Right-click in a textbox to obtain a Browse window  Can have the tool check for errors

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