----------------------------Original message---------------------------- I can confirm that Hawaii is covered in the 3" dems at edcftp.cr.usgs.gov . I am looking for code to readily view these dems in 3-D. I have tried Vista Pro, but you can do only a 512x512 tile if I recall correctly. I also tried reformatting the data for input to Excel 5 for us with the 3D charting capabilities. I could have died several times before one of my data sets got posted. Except for Grass which is far too big to install on user PCs, does anyone have suggestions/code to display USGS 3" DEMs in 3D? thanks