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Watershed and Stream Delineation Tool for ArcGIS 8.1

Watershed and Stream Delineation Tool for ArcGIS 8.1. By Milver A. Valenzuela TEXAS A&M UNIVERSITY. Introduction. What is ArcGIS 8.1?. What is new on ArcGIS 8.1?. ArcGIS 8.1. The three desktop GIS components of ArcGIS are: ArcView :composed by ArcMap, ArcCatalog and ArcToolbox.

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Watershed and Stream Delineation Tool for ArcGIS 8.1

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  1. Watershed and Stream Delineation Tool for ArcGIS 8.1 By Milver A. Valenzuela TEXAS A&M UNIVERSITY

  2. Introduction • What is ArcGIS 8.1? • What is new on ArcGIS 8.1?

  3. ArcGIS 8.1 The three desktop GIS components of ArcGIS are: • ArcView :composed by ArcMap, ArcCatalog and ArcToolbox. • ArcEditor: same as ArcView but with capacities for editing coverages and geodatabases. • ArcInfo: same as ArcEditor plus capacities for geoprocessing and with a full version of ArcInfo Workstation.

  4. Arc View 8.1 Extensions ArcCatalog ArcMap ArcToolbox Edit Shapefiles Geodatabases ArcView 8.1

  5. ArcGIS 8.1 Top ten features shared by ArcInfo, ArcView, and ArcEditor • Advanced editing tools • High-quality cartography • Internet-enabled • On-the-fly projection • Geocoding • Wizard-driven tools • Support for metadata standards using XML • COM-based customization • Extensible architecture • Direct read of more than 40 data formats COM-based customization

  6. What is COM? Component Object Model • It’s a technology developed by Microsoft Corporation. • COM establishes a common way of building software components. • Because of these, it can be written macros in VBA(GIS) or extensions in VB, Delphi and C++.

  7. What is COM? Component Object Model Client Server Interfaces Interfaces Interfaces Interfaces

  8. What is COM? Component Object Model Interfaces Properties Methods

  9. The Tool • Developed in VBA(GIS). • Follows a simple linear procedure. • From a simple input it can be delineated watersheds.

  10. The Procedure INPUT Procedure Output

  11. The Input • Digital Elevation Model • Threshold number • Output directory

  12. The Procedure • Fill sinks • Flow Direction • Flow Accumulation • Threshold condition • Grid Streams • Grid Watersheds • Vectorization of Streams • Vectorization of Watersheds

  13. The Output The following layers: • Filled DEM (fdem) • Flow Direction Grid (fdr) • Flow Accumulation Grid (fac) • Streams Grid (str) • Links Grid (lnk) • Watersheds Grid (wsh) • Vectorized streams (strl) • Vectorized watersheds (wshp)

  14. An Example: Delineating watersheds and streams for the Guadalupe River Basin. (Similar exercise done with CRWR-PrePro in class) • DEM: Guadalupe River Basin derived from USGS 15” of the United States (500m cell size), UTM projection. • Threshold: 500 cells: 500x500mx500m as minimum drainage area

  15. The DEM

  16. The Interface

  17. The Output: Filled DEM

  18. The Output: Flow Direction Grid

  19. The Output: Flow Accumulation Grid

  20. The Output: Streams Grid

  21. The Output: Links Grid

  22. The Output: Watershed Grid

  23. The Output. Vectorized streams and watersheds

  24. File system output

  25. Limitations • The process is irreversible. • We can’t save other output in the same workspace because the names of the files are fixed. It gives an automation error. • The program doesn’t have an specific error handler.

  26. The next step… • Add an “advance” button as well as more features. • Convert the program to dll.

  27. Questions & Comments

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