These images have been created form a variety of Digital Elevation Models (DEM's), mainly using IDL and ENVI, but alos PovRay and Wlbur.
Images are given three labels as in : "Palmer
: surf : DENR".
The first (hyperlinked) part gives the general location of the image, the
part describes the
image type while the third references the DEM datasource.
Images types inlcude
The DEM sources are given by the following acronyms :
Production of the "shade" and "surf" images involve combinations of
"derivative" images and density
images on various RGB colour channels. For example the "Palmer
: surf : DENR"
image uses a 1st vertical derivative image on onechannel, a
gradient image on a second channel and
a raster image on the third channel.
River networks images have been produced using Scott Peckham's RiverTools.