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Archive for July, 2009

Mapshaper

Monday, July 27th, 2009

picture-87Nice, intuitive, useful app to rapidly simplify a polygon or line shapefile. Very nice.

ArcMap: Simplify Polygon

Monday, July 27th, 2009

“Simplifies a polygon by removing small fluctuations or extraneous bends from its boundary while preserving its essential shape.” Here, the original (grey body) with a 0.1 Decimal Degrees (red line) and 1 DD (blue line): picture-83

ArcMap: Integrate

Monday, July 27th, 2009

“Compares features and makes any lines, points, or vertices within a certain distance range identical or coincident.”
picture-82

ArcMap: Number of Vertices

Monday, July 20th, 2009

Summary

In Workstation ArcInfo, the COUNTVERTICES command can be used to write the number of vertices for a line or polygon feature to the attribute table. Instructions provided describe how to do the same in ArcMap.

Procedure

  1. Right-click the layer and select Open Attribute Table.
  2. Click Options > Add Field to add a new field to the layer.
  3. Name the field NumPoints and select Long Integer for the type.
  4. Right-click the new field and select Field Calculator.
  5. Check the Advanced box.
  6. Copy the following text into the Pre-logic VBA Script Code text box.
    Dim pPointCount As IPointCollection 
    
    Set pPointCount = [SHAPE]

  7. Type the following text into the lower text box.
    pPointCount.PointCount 

  8. Click OK.

Source

Website Archives

Monday, July 20th, 2009

picture-77What to see how a website looked like years ago?