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| GeoCommunity Mailing List |
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| Subject: | [gislist] cluster tracking |
| Date: |
09/29/2005 09:40:02 AM |
| From: |
John Callahan |
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I have an interesting question I hope someone here can help me with. I
have access to ESRI software (ver 9.1) and Manifold 6.5 but willing to
use any type of code, script, etc..., that might help.
I have 20 years of monthly data. These data are global observations and
are gridded at 0.1 degree resolution. The data are highly clustered.
(Imagine a global map with scattered data points and about 10 - 20
easily identifiable clusters.) However, the clusters move (both the
intensity and breadth/deviation) through time. (Probably in a annual
cyclic pattern.) How can I track these clusters?
For example, there may be a high concentration of obs in NorthEast US in
Summer. During the Fall and Winter, the cluster moves south and becomes
less dense, more scattered. Then, it begins increasing density and
moving north again in the Spring. Does that make sense?
One thought is to convert each monthly grid into point data, and create
kernel density maps. Then, after applying the a common classification
to all months, create an animation then goes through all years. This
visually shows how the clusters move, but I would like a more
quantitative measure. Thanks for any thoughts you might have.
- John
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