I have downloaded several .hdf files of MODIS satellite imagery. It is 16-bit, signed integer data with values from -2000 to +10,000. I then divide the values by 10,000 using Raster Calculator to get a raster of NDVI values from 0.00 to 1.00. I would like to create some sort of symbology definition in which I can create the categories and colors assigned by the USGS, so that I do not have to manually enter these for each and every raster I process. Unfortunately, not one of these images has the full range of values - from 0.00 to 1.00 - it is usually on the low end for winter images and the high end for summer spring images, so I cannot use one of these datasets as a template.
Any suggestions? I do not think I can create a color map since it is 16-bit signed.
Thank you,
Marcus Ricci
USACE CERL, Champaign, IL
University of Illinois at Urbana Champaign