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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: interpolation question - chicken or the egg? |
| Date: |
05/11/2003 08:55:01 PM |
| From: |
RICK GRAY |
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Here's one for the GIS gurus on this wonderful list...=20
We collect weather data at a number of locations, run the data through comp=
uter models to predict a Disease Severity Value (DSV) for various crops bas=
ed on temperature and hours that the leaves are wet (dew, rain, etc.), then=
interpolate the DSVs to generate a map that farmers can use to ascertain t=
he best time to spray their crop. Farmers who subscribe to our service are =
given the DSV for their farm, as it is extracted from the interpolated map.=
=20
We have long pondered, but not had the time to experiment, as to whether in=
terpolating DSV's is actually better than interpolating the weather data, T=
HEN finding the DSV.
In other words, which way should generate the more reliable results? In the=
first instance, all the modelling is done with known values, so on first g=
lance it would seem to provide truest values. On the other hand, interpolat=
ing the weather parameters, then running the model at the farmer's location=
, might be just as good - and offers some advantages as we attempt to autom=
ate the process. We just don't know.
Has anybody looked into this? Know of any papers, etc. on the topic? Or eve=
n have some strong intuitions? I'd love to hear your feedback.
Thanks,
Rick
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