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. Example of a simple process Water Sugar Flour MIXED DOUGH

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

5. Geoprocessing/Model building Process

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 1. Erase 2. Clip 3. Union 4. Intersect Overlay operations combine more than one layers into one. Some of the extraction function can also be considered as overlay function 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. Example of intersect Areas common between the two layers. INTERSECT 3500’ buffer 2000’ road buffer

23. Buffering Lines 250’ Buffer

24. Using attribute table in buffering

25. Variable buffering using attribute

26. Multiple Ring Buffer

27. Buffer around Toxic Sites & water well location