I am thinking about cobbling together an interactive applet viewer for some large dataset public domain elevation data from the USGS (for the curious it's in ".BIL" format - an integer raster).  Basically I am just grabbing sections out of the file and moving around in the canyons etc and viewing it from different angles, like a virtual hiker, maybe overlaying some satellite vegetation coverage data if i get carried away.  Do you think jPCT would be a good choice for that, and/or do you forsee any pitfalls?  Or has someone already solved this problem...