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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: [gislist] 3D Intersection |
| Date: |
09/28/2005 10:00:01 AM |
| From: |
RICK GRAY |
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Rich,
I did a similar project in college once. I converted the shape files to grids
then subtracted the two. The cells must be small enough to have 1 tree per cell.
The difference (depending on the direction of your math) leaves you with a
positive number for all the trees that exceed the imaginary surface. You can
then associate this back to your original point file.
Rick
Rick Gray
GIS Specialist, Ontario Weather Network
http://www.ownweb.ca
GIS Instructor
Ridgetown College, University of Guelph
http://www.ridgetowncollege.com/
Tel. 519-674-1554
E-mail: rgray@ridgetownc.uoguelph.ca
Ridgetown: -81.883 W, 42.450 N
>>> "Leeson Richard L Contr 437 CES/CECP" <Richard.Leeson@charleston.af.mil>
09/27/05 3:07 PM >>>
Hello Listers,
We have a 3D polygon that is an imaginary surface above the airfield.
We also have a 3D point feature that represents trees. I want to be
able to select any tree that pokes above the imaginary surface, and not
the ones that are below it. Does anyone know how to do this? We have
access to basically the whole suite of ESRI products. Thanks in
advance.
Rich Leeson
GeoBase Coordinator
Charleston Air Force Base
Phone: 843-963-5017
Fax: 843-963-4993
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