Use the following links to learn more about map projections, datums, and coordinate systems.
Coordinates and Datums (added 16 August 1999) Authoritative guide to U.S. military coordinate systems.
Projections and Coordinates (added 22 July 1999) Nice, clear descriptions with figures. European point of view; good contrast with the omnipresent North American point of view. In French.
Map Projection Overview Peter Dana (U. Texas) provides a large organized collection of map projections. Note: his definition of "conformal" is not correct. A conformal projection preserves local angles, not scale.
Geodetic Datum Overview Peter Dana, U. Texas
Coordinate Systems Overview Peter Dana. Covers State Plane coordinates, planar systems, 3D systems, and many others (zip codes, e.g.)
Picture Gallery of Map Projections Direct links to pictures of many, many projections.
Mapping the Map Projection to the Need Collection of a dozen articles on map projections. From the Deasy geographics laboratory, PSU.
Selecting a Map Projection Detailed overview of criteria for choosing a map projection.
AUSLIG Calculation methods for spherical distances and areas plus datum and projection algorithms.
Map Projection Software Links to public domain cartographic software.
More Links From Hunter College.