I have downloaded NDVI from MODIS website and pixel values go up to -3000 to 1. I want to remove all values below -1. How do I do this?
I am using ENVI 4.3
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You could build a mask from your NDVI layer by using the -3000 as your mask value in the Build Mask dialog and then either apply the mask, or just use the resulting binary mask in whatever operation you're doing.
Beware, if you apply the mask and set all those values to 0, and then get your mean, they will still affect your average, like @dmahr is saying.