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What does GRID keyword to INTERPOLATE do? [message #81446]

Wed, 12 September 2012 10:46

David Fanning
Messages: 11724
Registered: August 2001

Senior Member

Folks,

Can anyone is explain in layman's language what the GRID
keyword to INTERPOLATE does?

I have a line of code like this:

warpedImage = Interpolate(data, xindex, yindex, MISSING=missing)

Where data is a 2D array and where xindex and yindex
are regular grids having dimensions of the output
warped image. All is well if I run the code like this.

However, if I set the GRID keyword to INTERPOLATE, then
my machine is either brought to its knees and I have to
reboot, or I get the "Unable to Allocate Memory to Make
Array" message. I am expecting a 300x300 output image,
but by setting the GRID keyword I seem to be creating
a 40000x40000 array! Why!?

Cheers,

David

--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.idlcoyote.com/
Sepore ma de ni thui. ("Perhaps thou speakest truth.")

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