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Map Projections By Peter Dana, The Geographer's Craft, University of Texas, Austin

Basic Coordinate Systems Overview P. Dana, Geographer's Craft, University of Texas, Austin

Geodetic Datum Overview By P. Dana, The Geographer's Craft, University of Texas, Austin

Map Projections A portion of Hans Zuuring's University of Montana GIS Course

Unofficial Catalog of Projections Parameters, notes, and PROJ.4 organization for many projections.

The GeoTIFF Web Page Some of Frank Warmerdam's links to GeoTIFF info

The Peters Projection An Accurate Area Map

Map Projection Bibliography Project

Understanding Map Projections A brief overview of map projections from GeoSystem Global Corp.

Defense Mapping Agency Technical Manual 8358.1 Datums, Ellipsoids, Grids, and Grid Refernece Systems Technical manual it is!

Geodesy for the Layman History of geodesy, surveying, physical and satellite geodesy, and the world geodetic system. Downloadable document from NIMA.

The Map Projection Home Page By Karen Mulcahy, Hunter College

Map Projections and Reference Systems for Europe MapRef by Stefan Voser

The National Geodetic Survey (NOAA/NGS) PC Software List, many free conversion programs, such as ENHANCEMENTS (Version 20). Performs field check computations, such as tape standardization, eccentric reduction, datum transformation, triangle (plane, spherical, geodetic), special (three-point fix, intersection, resection), geodetic (traverse, inverse, direct) computations, solar observation for azimuth, and State plane coordinate system computations on the NAD 27 and NAD 83 datums.

GPPCGP Version 2.0 Converts NAD 27 State plane coordinates to NAD 27 geographic positions (latitudes and longitudes) and conversely. Includes defining constants for all NAD 27 plane coordinate zones.

NADCON Version 2.1 Transforms geographic coordinates between the NAD 27, Old Hawaiian, Puerto Rico, or Alaska Island datums and NAD 83 values. Recommended for converting coordinate data for mapping, low-accuracy surveying, or navigation.

SPCS83 Version 2.0 Converts NAD 83 state plane coordinates to NAD 83 geographic positions and conversely. Includes defining constants for NAD 83 coordinate zones. State plane coordinates are entered or computed to 1 mm accuracy, while the latitudes and longitudes entered or computed correspond to approximately 0.3 mm accuracy.

UTMS Version 1.1 Converts geographic coordinates (latitudes and longitudes) on the Clarke 1866, GRS 80/WGS 84, International, WGS 72, or any user-defined reference ellipsoid to Universal Transverse Mercator (UTM) coordinates, and vice-versa.