I have a 32-bit GeoTIFF elevation file that was created using GPS survey points in Autodesk Civil 3D. It has been exported as a GeoTIFF with a custom Null Data value of -32767 for use in another program (GlobalMapper), which treats this value fine as a null value. When I bring it into ArcMap 10 (SP4), the lower value of the data is -32767 and shows up as a black collar around the area of interest (which is a fairly level area about 1010 - 1050 meters) making the area of interest solid white. The values in the black area are -32767.000000.
When I open the properties of the GeoTIFF in Arc, the NoData value is -3.40282346639e+038 in the Layer Properties -> Source -> Raster Information -> NoData Value block. I have tried to edit this value here (not editable) and in ArcCatalog by doing the same process (also not editable). Is there any way to set this value to -32767 so that it nulls out the black collar? I don't really want to change the NoData value in the data, just the NoData definition in the GeoTIFF's properties.
Thanks for the help...