Eric-
Thanks for the advice, I ran the raster calculator to run the NDVI and it maps it out with the values -1 to +1 values. However, I want to get those pixel values, and I don't know how to approach that now! Obviously by changing the original raster to a float to work out the raster calculation, the output NDVI is in float and I can't build an attribute table. Is there another way to find the pixel values of the NDVI equation? Specifically, I ran the NDVI over a large area, and I want to find the NDVI values of the individual habitats within the larger raster. So I guess the mean value of the wetland as a whole is all I really need, maybe there is an easy way to derive mean values of the selected pixels?
Thanks!
~Laura