American Society for Photogrammetry and Remote Sensing
ASPRS is a scientific association serving over 7,000 professional members around the world.

Satellite Images Gallery
Satellite Imaging Corp's gallery of high resolution satellite images taken all over the world.

NASA Earth from Space
A link to many sources of information from NASA.

Landsat Imagery
Many landsat images from Landsat 4, 5, and 7.

Global Landcover Facility
The GLCF develops and distributes remotely sensed satellite data and products concerned with land cover from the local to global scales.

Land Processes Distributed Active Archive Center
Search for and order earth science data products from NASA and affiliated centers.

Tropical Rain Forest Information Center
Imagery and information about rain forests from NASA.

Landsat 7 Homepage
The Landsat Project is the longest-running enterprise for acquisition of moderate resolution imagery of the Earth from space.

Earth Resource Mapper
Remote Sensing software company.

Leica Geosystems GIS and Mapping (ERDAS)
Leica Geosystems GIS and Mapping is Powering the Geospatial Imaging Chain.

National Oceanic and Atomospheric Administration
The NOAA provides information and imagery.

Ocean Remote Sensing
The Ocean Remote Sensing Group conducts research associated with civilian and military applications of remote sensing technology in the marine environment.

Dundee Satellite Recieving Station
Dundee Satellite Receiving Station, Dundee University, UK, maintains an up-to-date archive of images from NOAA, SeaStar, Terra and Aqua polar orbiting satellites.

Canada Centre for Remote Sensing
Provides imagery and information for Canada.

RADAR Sat International
Various Satellite Imagery.

ORBIMAGE
Global Imaging Information.

Space Imaging
Offer many high quality satellite images.

SPOT Image
A world leader in the supply of geographic information derived from satellite imagery.

TerraServer
A leader in online imagery.

Digital Globe
Provides high quality satellite imagery.

Eurpoean Space Agency
The European Space Agency is Europe’s gateway to space.

Earthshots
Satellite images of environmental change.

ESRI
A leader in GIS and Mapping software.

Open Geospatial Consortium (OGC)
A leader in the development of standards for geospatial and location based services.

Geospatial Information and Technology Association (GITA)
The premiere educational association for geospatial information and technology professionals.

International City/County Management Association (ICMA)
Creating excellence in local government through professional management.

Spacial Technologies Industry Association
Dedicated to increasing the participation of commercial geospatial technology companies affecting the geospatial industry in the United States.

Iowa Geographic Image Map Server
On-line source for geographically-referenced imagery.

GeoCommunity
The premiere portal for geospatial technology professionals.

Iowa DNR GIS Library
A collection of more than 15,000 geographically referenced databases.

Iowa State University GIS Facility
Provides a high level GIS research support laboratory and provides GIS education and outreach to the ISU community and the state of Iowa.

National Cartography and Geospatial Center
Provides leadership in a partnership effort to help people conserve, maintain, and improve our natural resources and environment.

Berry and Associates Spatial Information Systems (BASIS)
Educational material about various ways in which GIS is used.

RADAR Sat International
Various Satellite Imagery.

ORBIMAGE
Global Imaging Information.

Space Imaging
Offer many high quality satellite images.

SPOT Image
A world leader in the supply of geographic information derived from satellite imagery.

TerraServer
A leader in online imagery.

Digital Globe
Provides high quality satellite imagery.

TerraFly
Virtually "Fly" over the entire United States.

GPS World
Lots of information about GPS.

Trimble
Trimble Navigation tutoirials for GPS.

GPS Today
Sam Wormley.

GPS Overview
Peter Dana's overview of GPS.