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NR 322: Single Layer Analysis

NR 322: Single Layer Analysis. Jim Graham Fall 2008 Chapter 8 & 9. Geometric Calculations. Add A Field. Add a double. Polyline Geometry. Use an “Equidistant Projection”. Polygon Geometry. Use an “Equal Area” Projection. Centroid. Making Centroids. Add fields for X and Y

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NR 322: Single Layer Analysis

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  1. NR 322: Single Layer Analysis Jim Graham Fall 2008 Chapter 8 & 9

  2. Geometric Calculations

  3. Add A Field • Add a double

  4. Polyline Geometry • Use an “Equidistant Projection”

  5. Polygon Geometry • Use an “Equal Area” Projection

  6. Centroid

  7. Making Centroids • Add fields for X and Y • Use “Calculate Geometry” to add the X and Y coordinates of the centroid • Open the dbf in Excel • Save the dbf to a tab-delimited text file • Use “Tools -> Add X Y Data” to add the text file as points

  8. Buffering • Creates polygons around existing vector features

  9. Buffering • ArcToolbox -> Analysis -> Proximity -> Buffer

  10. Buffering • Create a polygon Shapefile for buffers • Open the “Editor” toolbar • Start an edit session • Select a feature using the edit tool • Task: Create new feature • Target: <your new shapefile> • Select “Buffer” from the “Editor” menu • Enter the distance for the buffer to add around the feature

  11. Dissolving • ArcToolbox -> Data Management Tools -> Generalization -> Dissolve • Combines features based on a common attribute value

  12. Clip • ArcToolbox -> Analysis Tools -> Extract -> Clip • ArcToolbox -> Overlay -> Erase • ArcToolbox -> Data Management Tools -> Raster -> Clip

  13. Intersection • ArcToolbox -> Analysis Tools -> Overlay -> Intersect • ArcToolbox -> Spatial Analysis Tools -> Local -> Combine

  14. Generalization • ArcToolbox -> Data Management Tools -> Generalization -> …

  15. Generalization (100 meters) Original Generalized to 100 meters

  16. Generalization (1000 meters) Original Generalized to 1000 meters

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