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warp_tri() [message #54928]

Wed, 18 July 2007 07:28

greg.addr
Messages: 160
Registered: May 2007

Senior Member

I've written some code to warp an image into a map projection using
warp_tri(). This works fine, but the area outside the warped image is
left filled with some uniform value that I can't track down:

res=warp_tri(xo,yo,x,y,im,output_size=viewport)

IDL> print,min(res),max(res)
0.218271 0.723637

IDL> print,res[0,0],res[430,620]
0.541057 0.541057

I suppose it's coming from the INTERPOLATE function. I'd like to set
it to some special value (say, zero) so that I can mask it out. I
tried modifying the interpolate line in the warp_tri() code to use
MISSING=0. but that didn't make any difference. Has anyone any
suggestion?

thanks,
Greg

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