I want to modify the underlying landclass in my area. The Terrain SDK states that this is possible, I followed the whole description through to the point where resample examples are found, I see whats going on and I have no trouble using resample.exe to create the example .BGL files which then show up in TmfViewer.My problem is that I do not understand the relationship between the values in the source greyscale image (say "ModifiedGlccSubset1.tif") and the resulting Landclass values found in the .BGL file that is generated.Lets say I want a landclass value of 10 "Irrigated grassland" in my BGL file, what greyscale value in my source image will give me that result?I have searched through the SDK many times and I can't find this information.I hope I am not missing something basic here!Geoff

Hi Goeff.If you want 10, then the greyscale value is 10.The greyscale palette is 0-255 ( 8 bit ) with 0 as black and 255 as white.Dick

Hah!That simple eh?Thanks Dick, - I will give it a try...Geoff