National Oceanic & Atmospheric Administration - NOAA.

• NOAA Geosciences Research Division
• NOAA Data Set Catalog
• National Geophysical Data Center (NGDC)
  • National Geophysical Data Center (NGDC), Solid Earth Geophysics Division
  • World Data Center System

• National Geodetic Survey - NGS
  Γεωδαιτικη Yπηρεσια των HΠA
  

• Federal Geographic Control Subcommittee (FGCS)

U.S. Geological Survey - USGS. Γεωλογικη Yπηρεσια των HΠA.

• National Mapping Division, see also
  National Mapping Information
• Mapping Applications Center
• Federal Geographic Data Committee (FGDC)
  
• Manual of Federal Geographic Data Products, see also
  Alternate Link
• Products, Information, and Services
• Data Standards
• SDTS : Spatial Data Transfer Standard

  USGS Online Data and Servers
  

• National Spatial Data Infrastructure (NSDI)
• Geographic Names Information System
• Global Land Information System
• US GeoData (National Digital Cartographic Data Base)
• NGDC : National Geospatial Data Clearinghouse
• Popular Digital Geospatial Data Set Collections
• Digital Geospatial Data Set by Theme
• GLIS : Global Land Infomation System
  • 30 Arc-Sec. DCW Digital Elevation Models
  • 5 Minute Gridded Earth Topography Data
  • Conterminous U.S. AVHRR
  • MultiSpectral Scanner Landsat Data
  • Space Shuttle Earth Observation Program
  • SPOT High Resolution Visible Data
  • Thematic Mapper Landsat Data
  • USGS Land Use and Land Cover Data
• Cartographic Data

Census Bureau

• TIGER Homepage

  Online Data and Servers
  

• TIGER Mapping Service
• U.S. Gazeteer

National Imagery and Mapping Agency (NIMA)
NIMA Department of Geodesy and Geophysics

Environmental Protection Agency (EPA)

• EPA National GIS Program

  EPA Online Data and Servers
  

• Office of Policy, Planning and Evaluation - GIS Data Sites
• EPA's National Spatial Data Infrastructure Node
• Envirofacts Warehouse
• Data Systems

Defense Mapping Agency - DMA

U.S. Army Corps of Engineers. Topographic Engineering Center, Precise Survey Team.

U.S. Coast Guard - USCG, Navigation Center., see also U.S. Coast Guard - Global Positioning System

U.S. Naval Observatory - USNO.

• Ftp Server with GPS information etc.

Professional and Scientific Organizations

American Congress on Surveying and Mapping (ACSM)
Association of American Geographers (AAG)
American Society for Photogrammetry and Remote Sensing (ASPRS)
See alsoASPRS
Urban and Regional Information Systems Association (URISA)
American Geophysical Union (AGU)

Geomatics Canada,
Natural Resources Canada / Ressources Naturelles Canada (NRCan)
Xαρτογραφικος Oργανισμος του Kαναδα

• Canada Center for Remote Sensing - CCRS
  • National Atlas Information Service - NAIS
  • NAISMap - National Atlas Information Service (Canada) WWW-based GIS (very impressive)

Geodetic Survey Division - GSD

Centre for Topographic Information - CTI

• Topographic Map Service (CTI Ottawa)
• Digital Topographic Information Service
  (CTI Sherbrooke)

Legal Surveys Division (LSD) and International Boundary Commission

Canadian Geodetic Reference System Committee (CGRSC) Provincial Member Agencies

British Columbia
Operations Section, Geographic Data, B.C., Ministry of Environment, Lands and Parks

• Link to Geographic Data British Columbia: Geo-Spatial Reference

Alberta
Data Distribution Branch, Resource Data Division, Alberta Environmental Protection

Nova Scotia Geomatics Centre

New Brunswick Geographic Information Corporation

Information on other CGRSC Members

Other Government Centres

Canadian Atlantic Geoscience Centre

Secretaria de Medio Ambiente, Recurcos Naturales y Pesca (SEMARNAP)
Environment, Natural Resources and Fisheries Secretariat of Mexico
Yπηρεσια Περιβαλλοντος, Φυσικων και Θαλασσιων Πορων του Mεξικο