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Image division causes Floating illegal operand [message #48769]

Thu, 18 May 2006 10:55

elsueniero
Messages: 5
Registered: May 2006

Junior Member

Hello,

I am writing a small program to calculate NDVI from MODIS images. I
got a mask of the valid pixels (no clouds or water) and two calibration
coefficients. The code is

partA = (b1*coef[0,1] - b0*coef[0,0])*mask
partB = (b1*coef[0,1] + b0*coef[0,0])*mask

ndviimg = partA / partB

ind = Where(Finite(ndviimg, /NAN), count)
IF count GT 0 THEN ndviimg[ind] = -1000.0

But I allways get an "Program caused arithmetic error: Floating illegal
operand" even if the resulting image looks good.
The problem is in the division, because if I comment the line, it won't
show.

Any ideas how to avoid this?

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