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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Need to place points at specified density into a
polygon |
| Date: |
08/21/2002 03:38:18 PM |
| From: |
Quantitative Decisions |
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At 12:31 PM 8/21/02 -0500, Layne Seely wrote:
>I am trying to place points (trees) at a specified planting density into a
>polygon theme in AV 3.2a. I am trying to get AV to do this for me (if
>possible) as I need to place 460 trees in 3.87 acres and then another 1380
>shrubs.
>
>Has anyone done this before? If so, how?
These operations recur in many applications. Some well known solutions are
(1) independent random locations, (2) a regular grid of locations, and (3)
independent random locations within cells of a grid.
Solution (1) is implemented in the free ArcView extension "Simple Random
Sample" available on ESRI's ArcScripts pages or via the link from our pages
at www.quantdec.com (go to Free Software).
Solutions (2) and (3) are implemented in the inexpensive ArcView extension
"Sample" available through the Catalog pages on our website. General
information about these techniques, in the form of non-technical but
detailed, illustrated articles, appears at http://www.quantdec.com/sample/
and http://www.quantdec.com/GIS/affine.htm .
Bottom line: Using either of these extensions you can fill out a single
form and have your results, as maps and tabulated coordinates, within seconds.
Cheers,
Bill Huber
Quantitative Decisions
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