- Species Diversity
Adding X,Y Centroids to Polygons in ArcGIS ArcView
Creating a centroid point file from a polygon in ArcEditor or ArcInfo is quick and painless. In ArcToolBox go to Data Management Tools/Features/Feature to Point and follow instructions.
There is a downside to this convenience however. 8,910 dollars of them in fact, the cost of an ArcInfo license.
How to calculate centroids in ArcView.
- In the attribute table of your polygon layer and under Options choose Add Field.
- Add an X and Y field of type Double
- Right-click on the New X Column Header and choose Field Calculator.
- In the Field Calculator Dialog that opens, click Help
Here's all the instructions you need, but they are written in ESRI. Allow me to translate. Copy this section:
Dim Output As Double
Dim pArea As IArea
Set pArea = [Shape]
Output = pArea.Centroid.X
Paste it into Field Calculator. Check Advanced, and enter Output into the final textbox.
- Click OK and repeat for Y.
You now have the X,Y coordinates of the polygon centroids. If you really need a separate point layer, copy the DBF file for your polygon layer to a new file and add as a point layer using the Add X,Y Data... dialog under the Tools menu.
Posted by idfg-bthomas at 05/17/2011 in
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