Geodesy

Datum Pro - Windows program which converts between map datums and projections, including Gauss Kruger, TM, UTM, and Lambert Conic grids.
http://www.geomatix.net/datumpro

National Imagery and Mapping Agency Geospatial Sciences Division - Branch of US military responsible for maintaining satellite geodesy, conducting geodectic survyes, and collecting, processing, and evaluating gravity data (free-air and Bouguer gravity anomalies).
http://earth-info.nga.mil/GandG/

Geodesy for the Layman - The publication attempts to develop an appreciation of the scope of geodesy and to generate some understanding of the problems encountered in the science.
http://www.ngs.noaa.gov/PUBS_LIB/Geodesy4Layman/toc.htm

Land Surveying and Geomatics: Geodesy - Links to education and government sites.
http://surveying.mentabolism.org/

Geodesy Laboratory & PANGA Data Analysis Facility - They are part of a research program with the Department of Geological Sciences, Central Washington University.
http://www.geodesy.cwu.edu/

Curtin University Geodesy Group - Overview of the geodetic activities the group, biographies of members and details of recent research projects.
http://www.cage.curtin.edu.au/~geogrp/

James Q. Jacobs - Geodesy Page - Definitions relating to geodesy, explanations of coordinate systems, and geodesy formulas. Reference ellipsoid defined with derived geometrical constants, equation of the meridional ellipse, and geometry of the meridian section.
http://www.jqjacobs.net/astro/geodesy.html

Geodetic Datum Overview - Introduction to geodetic datums, geometric earth models, global coordinate systems (such as latitude and longitude), datum conversions, and related topics. University of Texas.
http://www.colorado.edu/geography/gcraft/notes/datum/datum_f.html