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

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Presentation on theme: "NR 322: Single Layer Analysis Jim Graham Fall 2008 Chapter 8 & 9."— Presentation transcript:

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: 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) OriginalGeneralized to 100 meters

16 Generalization (1000 meters) OriginalGeneralized to 1000 meters


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