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map_patch and triangulating satellite images [message #36302]

Fri, 29 August 2003 09:41

sraffuse
Messages: 1
Registered: August 2003

Junior Member

Hello,

I am trying to use map_patch to warp a swath of satellite data to
geographic coordinates. I have lat/lons for each pixel and the data
are not evenly spaced, so I am using the triangulate keyword. In
fact, the call looks like this:

warped = map_patch(data[0,*,*], longitude, latitude, /triangulate)

The problem is that the routine triangulates between pixels that don't
makes sense. My data is concave on both the left and right. The
final warped image should be shaped sort of like an hourglass. I do
not want the data interpolated at the "neck" of the hourglass, forming
a rectangle. This area should be simply null. map_patch() connects
the data from the top and bottom of the image together.

Has anyone else had to deal with this problem? Any ideas? Does my
explanation make sense?

Thank you in advance,

Sean Raffuse

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