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| Subject: | [gislist] Mapping aquatic substrates |
| Date: |
04/23/2004 11:40:01 AM |
| From: |
William Western |
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Listers,
Just wondering if any of you have ever used Thiessen Polygons to map out
substrates, specifically in an aquatic setting.=20
My dataset contains a large amount of transect points collected during a
sonar survey of the bottom of a river. The points include attributes
which define the substrate compaction and composition as discreet
nominal data. For example, Hard compaction =3D 1, Medium compaction =3D =
2,
and Soft compaction =3D 3. This is discreet data, so a hard substrate =
can
switch to a soft substrate without a medium substrate separating them.
I've been experimenting with Thiessen polygons for interpolating
substrate polygons and am fairly happy with the results so far. Has
anyone else used Thiessen polygons to do this, or know of any literature
that discusses this?
Thank you and good day,
Bill
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