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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | RE: [gislist] Polygon Intersections |
| Date: |
01/08/2004 01:45:01 PM |
| From: |
Bill Medina |
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If you use Geoprocessing or XTOOLS option to intersect your themes you keep
track of the polygon ID for each area, so you will have areas for each
intersected polygon with the record of where do they come from. Then you can
summarized them (could be better in excel) to get the percentage of area for
each one. Take into account that when you intersect two themes, the areas
that are out of the extend of the other layer are cut, so you may have to
use the original polygon areas if you want to know the percentage of the
original polygon that is assigned to each new polygon in the intersected
theme.
Some math have to be added to the tables to get the percentages that you
want...
Bill
-----Original Message-----
From: gislist-bounces@lists.thinkburst.com
[mailto:gislist-bounces@lists.thinkburst.com]On Behalf Of
mstone@directcon.net
Sent: Thursday, January 08, 2004 2:24 PM
To: gislist@lists.thinkburst.com
Subject: [gislist] Polygon Intersections
Dear lists:
I have seen some discussion of my topic but nothing to fully satisfy my
needs.
Am wondering if anyone has script, etc. that will do more than the ArcView
intersection of polygon tool that just gives the number of intersecting
objects
for each polygon with one summary statistic.
My issue is, if I have two shape files (e.g. A, B) I want to know how many
objects in file B intersect each object in file A, and their corresponding
proportions, such as for polygon A1, (B1, B2, B3) intersect it with B1
contributing 20% of itself, B2 contributing 25% of itself, B3 contributing
30%
of itself, etc.
Hopefully this makes sense. Suggestions for creating this would be helpful
if
no one has done this but I am not well-versed in the ArcObjects
model.
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