| Re: vector layer comparison in IDL [message #42881 is a reply to message #42824] |
Thu, 03 March 2005 03:00   |
yp
Messages: 42
Registered: February 2005
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Member |
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Mark Hadfield wrote:
> 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)
Thanks Mark,
You guessed it right. I got to calculate the absolute error (distance)
assuming that one is *true* and the other is *estimated* from other
sources.
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