[Qgis-user] Raster calculator produces Nan values

[Geco Enterprises]

Hi

I am using the raster calculator to compute NDVI maps from nanosatellite
images. I have one image (one out of many) for which the calculator
produces an output image of Nan values. No problems with any of the other
images.

The original 4-band 16-bit image has values in all channels - the histogram
in properties dialog looks fine.

I also used Clipper to cut out a small polygonal portion (an agricultural
field) of the original satellite image, and that works, and similarly has
positive pixel intensities in all 4 channels. But applying raster
calculator also produces an image filled with NaN values.

Can anyone suggest how I might detect the source of the error?

Dvoralai

-- 

*______________________**Geco Enterprises Ltda*
*Centro de I+D *
San Fernando, Chile
*Tel: +56 (0)72 258 3066      *
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