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Python, ArcToolBox, & Geoprocessing

Python, ArcToolBox, & Geoprocessing. MapMyRun.com. Overview. ArcToolbox overview ArcGIS Python scripting The arcgisscripting module & Geoprocessor object Environment settings Accessing system/custom tools Workspaces Case sensitivity Geoprocessing / Python helpful resources. Example:.

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Python, ArcToolBox, & Geoprocessing

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  1. Python, ArcToolBox, & Geoprocessing

  2. MapMyRun.com

  3. Overview • ArcToolbox overview • ArcGIS Python scripting • The arcgisscripting module & Geoprocessor object • Environment settings • Accessing system/custom tools • Workspaces • Case sensitivity • Geoprocessing / Python helpful resources

  4. Example: ArcToolbox & Geoprocessing * ArcToolbox Toolbox * * Tool Toolset Tools may have same nameif they are in different toolboxesExample: Clip_analysis Clip_management System tool Model Toolboxes, Toolset, Tools depend on license Script

  5. Accessing Geoprocessing in ArcGIS • GUI • Command line • Models • Scripts

  6. Scripts and ArcToolbox • Scripts can be added as tools to ArcToolbox • Should be fully debugged before they are added as a tool • Use PythonWin, for example, to run the script interactively until it is working perfectly • Can add flow control to your models • Branching with “if … elif … else” and output parameters (e.g. boolean) can be used to control flow • Repetition with “for” or “while”(Geoprocessing at 9.4 will offer iterators)

  7. arcgisscripting module The arcgisscripting module provides the method for you to create a Geoprocessor object PYD files are in the format of a .DLL file.

  8. arcgisscripting.create() Creating an ArcGIS Geoprocessor object …

  9. Python eval()

  10. Geoprocessor Dynamic Methods & Properties • Environment/Tool are dynamic methods/properties of the Geoprocessor • Names and values are dynamic as we will see in next few slides

  11. Environment settings • Parameters for a geoprocessing session • Saved in MXD/MXT, model, or script

  12. 9.2 had enumerations None envs.next() Enumeration objects have next and reset methods envs.next() envs.reset() envs.next() envs.next() None 9.3+ has Python lists

  13. Geoprocessor & Environment settings

  14. Geoprocessor Dynamic Methods & Properties • Environment/Tool are dynamic methods/properties of the Geoprocessor • Names and values are dynamic as we will see in next few slides

  15. Accessing system tools in Python • gp.<ToolName>_<ToolboxAlias> Use Toolbox alias on your toolboxes and tools.

  16. Workspaces • As far as the geoprocessor is concerned, a workspace is a: • Folder as described above • A file-based geodatabase • A geodatabase in Microsoft Access format • An SDE database connection

  17. Accessing a Workspace • gp.Workspace specifies the default workspace containing your data • This is optional … it does not need to be set to do geoprocessing • You can process data in different folders in the same geoprocessing command.

  18. .Exists and .OverWriteOutput • gp.Exists(object) • Test whether or not an object exists (folder, geodatabase, file, toolbox, etc.) • gp.OverWriteOutput = True (1) or False (0) • Specifies whether or not output files will overwrite files of the same name.

  19. Overview • ArcToolbox overview • ArcGIS Python scripting • The arcgisscripting module & Geoprocessor object • Environment settings • Accessing system/custom tools • Workspaces • Case sensitivity • Geoprocessing / Python helpful resources

  20. Be sensitive to case sensitivity • Geoprocessor properties / methods ARE NOT case sensitive • Path names ARE NOT case sensitive • Any variables that you use ARE case sensitive Either of these works fine …

  21. Geoprocessing help – ArcGIS Tutorial Focus is mostly on solving geoprocessing problems with models. However, does show how to use scripts in models.

  22. Geoprocessing help – Overlay & Extract poster Nice one-pager that graphically showsoverlay and extract functions.

  23. Geoprocessing help – “Quick Guide”

  24. Geoprocessing help – 9.2 Geoprocessor OMD

  25. Geoprocessing help – 9.3 Geoprocessor OMD Geoprocessing help – 9.3 Geoprocessor OMD

  26. Geoprocessing help – Automating with scripts

  27. Geoprocessing help – Tool reference

  28. Geoprocessing support page

  29. Overview • ArcToolbox overview • ArcGIS Python scripting • The arcgisscripting module & Geoprocessor object • Environment settings • Accessing system/custom tools • Workspaces • Case sensitivity • Geoprocessing / Python helpful resources

  30. For $1 Million …

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