Created by Lang Moore, Bill Mueller and David Smith for the Connected Curriculum Project, the purpose of this module is to establish the meanings of gradient and directional derivative in the context of a contour map of...

This United States Geological Survey (USGS) fact sheet provides information on USGS professional papers, bulletins, and circulars that deal with map projections. The information includes descriptions of common...

The Virtual Terrain Project (VTP) homepage has a wealth of information about three dimensional environment rendering, as well as links to many different research efforts and papers about the subject. The project's aim...