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An overview of Geoprocessing

An overview of Geoprocessing. Geoprocessing. Geoprocessing is a fancy name for Spatial Operations. So what is Geoprocessing ?. Processing or manipulating of geographic/spatial data to create a new dataset. . Flour. Sugar. MIXED. DOUGH. Water. Example of a simple process.

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An overview of Geoprocessing

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  1. An overview of Geoprocessing

  2. Geoprocessing Geoprocessing is a fancy name for Spatial Operations So what is Geoprocessing? Processing or manipulating of geographic/spatial data to create a new dataset.

  3. Flour Sugar MIXED DOUGH Water Example of a simple process

  4. A typical Geoprocessing Input Dataset Output Dataset Geoprocessing Projected Data Unprojected Data Project Output Data Tool Input Data • A process contains tool • And a tool has parameters

  5. Process Process Process Geoprocessing/Model building

  6. Tools in ArcToolbox • There are literally hundreds of Geoprocessing tools available in ArcGIS! • Most of the time you will use only a few of them

  7. Geoprocessing Menu • Commonly used tools are available from Geoprocessing menu!

  8. Environment Settings Application level settings affect all tools and menus Tool settings affect one execution of one tool

  9. Workspace settings • Current and scratch workspace • Output coordinate systems

  10. ArcToolbox has many tools

  11. Map Overlay • Map overlay brings data from multiple layers into one • There are two basic categories of map overlay functions 1. Functions that combine attribute data & 2. Functions that do not

  12. Overlay operations in ArcGIS Overlay operations combine more than one layers into one. Some of the extraction function can also be considered as overlay function 1. Erase 2. Clip 3. Union 4. Intersect Extraction only & does not combine attribute from layers Combine attributes from layers

  13. Select by location Can’t truncate the roads at the boundary!

  14. Clip is the rescue! Clip is used to cookie cut the original ROAD layer into a smaller layer

  15. What is Clip? Clip is used to cookie cut the desired areas

  16. Erase Only the features outside the Erase feature are kept, everything else are erased

  17. Dissolve Dissolve is used to aggregate features based on specified attributes If you don’t choose an attribute, it will dissolve all into one!

  18. How to simplify the landuse data DISSOLVE

  19. Dissolve wizard

  20. What is Union? Union combines two polygon layers together

  21. What is Intersect? Computes geometric intersection of two layers

  22. INTERSECT 3500’ buffer 2000’ road buffer Example of intersect Areas common between the two layers.

  23. Buffering Lines 250’ Buffer

  24. Using attribute table in buffering

  25. Variable buffering using attribute

  26. Multiple Ring Buffer

  27. Multiple Ring Buffer Buffer around Toxic Sites & water well location

  28. ?

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