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| GeoCommunity Mailing List |
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| Subject: | [gislist] calculate change in cropland for Missouri |
| Date: |
02/12/2004 12:30:01 PM |
| From: |
True, Cynthia D. |
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We would very much like to calculate change in cropland for Missouri.
Right now all we have is the county summaries from NRCS. When we
overlay crop change with our other grids, we get some strange looking
output, due to the hard boundaries at the county lines. My boss came up
with an idea to "improve" the look of the outcome.
How does this sound:
- calculate total acres lost or gained in cropland,
- assign that value to the centroid of each county, and rank 1 to 5 in
terms of acres lost to cropland
- create a surface from the centroids, thus getting rid of the county
boundaries -- this will give the surface a smooth look, at least
The question is: will the result be less valid versus assigning values
to the counties? If not, the we might as well do this to get rid of
those hard county boundary lines.
Is this any worse than assigning one value for the whole county when it
obviously varies depending on where you are in the county? Would we be
better off getting LUDU or GIRAS and comparing that to NLCD to get
change in cropland? Either way has some serious shortfalls, but what
else is there? I am interested in hearing your opinion.
Thanks for the help,
dt
C. Diane True
Missouri Resource Assessment Partnership
http://www.cerc.usgs.gov/morap/=20
(USA voice) 573-441-2794
"For if one link in nature's chain might be lost, another might be
lost, until the whole of things vanishes by piecemeal."
- Thomas Jefferson
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