While cartography, surveying, navigation, and astronomy all make use of geodetic datums, the science of geodesy is the central topic of the site. The Map Projections Home Page at Hunter College, by Karen Mulcahy, has a collection of information relating to map projections. American Digital Cartography, Inc., has been developing digital map products for national and international engineering, business, and communications companies since 1988. There is an interesting World Map product. This site gives a complete US census on a single CD with over 375,000 areas and over 3,500 demographic variables.
Many related links are available, including a master data base to facilitate searching.
National Geophysical Data Center . A web site for all sorts of geological and earth resources information and data. National Ocean Service is a source of information for mapping and charting of ports and oceans, etc. National Imagery and Mapping Agency provides access to the world's imagery, imagery intelligence and geospatial information. USGS , United States Geological Survey.