| Re: vector layer comparison in IDL [message #42923 is a reply to message #42824] |
Tue, 01 March 2005 12:55   |
Mark Hadfield
Messages: 783
Registered: May 1995
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Senior Member |
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yp wrote:
> Well, here I have two sets exported coordinated (X=lon, Y=Lat) of the
> same area at two different times. The task is to see the spatial
> difference between the two layers (In this example I dont have any
> closed polygon, but that should be kept in mind for future)
Well, they do look very similar, but not identical...
Have you given any thought to what the term "spatial difference" could
or should mean? What are you trying to achieve with your comparison?
Once you work that out, there's no doubt you can use IDL to calculate it
for you. Are you interested, perhaps, in the maximum distance between
the two "coastlines"?
--
Mark Hadfield "Ka puwaha te tai nei, Hoea tatou"
m.hadfield@niwa.co.nz
National Institute for Water and Atmospheric Research (NIWA)
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