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Digital Spatial Data Clearinghouse

GIS-Related Links by Subject

see also GIS-Related Links by Geographic Area

Aerial Photography Geosciences Remote Sensing
Census/Socioeconomic Health Software
Climate and Weather History and Culture Soils
Data Clearinghouses Jobs Topography
Elevations Land Use/Land Cover Transportation
Environmental Organizations Tutorials
Games, Trivia and Fun Parcels/Property Info User Groups and Forums
General GIS Info Publications Vegetation
Geocoding Reference Web-Based Mapping

see also AGSL Geographic Links


Almost every file format in the world!
A list of extensions of "almost every file format in the world."

Center for Geographic Analysis - Technical Support [Harvard Univ.]
This is a good general GIS resource list with links to GIS tools and tips.

Dictionary of Abbreviations and Acronyms in Geographic Information Systems, Cartography, and Remote Sensing [Univ. of California Berkeley]
A fairly comprehensive site for GIS, cartography and remote sensing terminology and organizations.

Federal Information Processing Standards (FIPS) Codes
Find out the three-number county FIPS codes for U.S. states and possessions on this website. These codes are used in many federal datasets to indicate the geographical extent of files.

GIS Dictionary [Association for Geograhpic Information (AGI)]
This site is a good resource of GIS-related words and their definitions. Words can be located with a lookup search, or list by alphabetical or subject category. A list of acronyms is also provided, including links to source bibliographies and related sources of terminology.

GIS Dictionary [ESRI]
This site contains a list of GIS-related terms with an emphasis on ESRI software-specific ones. Items include a brief, one-paragraph definition, and are lightly cross-referenced.

How far is it? []
Find out how far it is from one place in the world to another. View a map of those two places using the Xerox PARC viewer.

List of File Formats (Alphabetical) [Wikipedia]
An alphabetical list of filename extensions.

Map Projections [USGS]
A discussion of major map projection types and their uses.

SDTS - Everything you want to know about SDTS!
A number of articles, downloads, resources, translators, and tutorials designed to make working with spatial data transfer standard (SDTS) data easier.

UTM [Universal Transverse Mercator] Grid Zones of the World
Map showing the UTM zones worldwide, provided by DMAP.

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Remote Sensing / Aerial Photography

Basic Science and Remote Sensing Initiative (BSRSI)
This site describes the BSRSI, a research program in the Department of Geography at Michigan State University. The site describes BSRSI's research profile, job openings, graduate studies, facilities, staff, procedures, and documents.

Boston Atlas
Search Boston orthophotos by word, phrase, or address and add GIS data layers to image.

Canada Centre for Remote Sensing (CCRS) [Natural Resources Canada]
The government of Canada's centre of expertise for space-based remote sensing science and technology.

CEOCat3 CCRS Earth Observation Catalogue [Natural Resources Canada]
View and download remote sensing imagery of LandSat 7, Radarsat, NOAA/AVHRR imagery and more.

Cities Collection [NASA]
Outstanding astronaut photography of cities takenduring spaceflight.

Purchase high-resolution commercial imagery.

Find and order satellite images, aerial photography, and cartographic products from the USGS.

Earth Resources Observation and Science (EROS) Center [USGS]
Access to aerial photographs, digital elevation models, digital raster graphics, satellite imagery, and land cover data.

Earthshots: Satellite Images of Environmental Change [USGS]
This site from the USGS shows satellite imagery linked to relating articles about environmental change around the globe. Click on the world map for the area image and the related article.

Global Land Cover Facility (GLCF) [Univ. of Maryland]
Search, browse and download free satellite imagery.

Online library of aerial photographs, satellite images and maps for sale.

GRIN: Great Images In NASA
This site contains "a collection of over a thousand images of significant historical interest scanned at high-resolution in several sizes." Images may be searched, browsed, or downloaded.

Ionia GlobCover [European Space Agency]
Download global land cover at 300-meter resolution covering the period December 2004 to June 2006.

Live Search Maps [Microsoft]
This site is a free online local search and mapping service that combines road and aerial maps worldwide and unique bird’s eye imagery for select areas.

Online mapping store, with air photos, satellite images, DEMs, street maps and data for sale.

The National Map Seamless Server [USGS]
Free downloads of orthoimagery and Landsat imagery. Also has transportation, boundaries, hydrography, land cover and elevation data.

NIX [NASA Image eXchange]
This site contains a web-based search engine for searching one or more of NASA's online multimedia collections. Searching is performed using keywords. NIX returns thumbnail sized images, textual descriptions, image numbers, links to higher resolution images, and links to the organization that stores each image.

Photojournal [NASA-Jet Propulsion Laboratory]
Over 2,000 Shuttle Radar Topography Mission images are available to view or download.

SAXTA Project
The SAXTA Project is a distributed system of sharing high-resolution Earth observation data sets. "The objective is to dramatically improve access to, and distribution of, high-resolution satellite data sets for the science, applied science, and education communities."

Shoreline Data Explorer [NOAA]
The Data Explorer provides high-resolution digital shoreline from multi-temporal surveys of the United States' coastline.

Shuttle Radar Telemetry Mission (SRTM) [NASA]
"This is the SRTM home page. The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth."

Shuttle Radar Telemetry Mission (SRTM) [USGS]
SRTM data is available for download through the USGS EROS data center, which can be reached from this site.

Southeast Wisconsin Regional Land Information Aerial Photography
Information on the Southeast Wisconsin Regional Planning Commission's (SEWRPC) aerial photography program. Includes an orthophoto viewer.

Spot Image
SPOT and FORMOSTAT 2 satellite imagery for sale.

TerraLook: Satellite Imagery to View a Changing World (USGS)
Users can order georeferenced JPEG satellite images through the GloVis ordering system.

Aerial photography and satellite imagery for sale.

USDA National Agriculture Imagery Program (NAIP)
Information regarding this federal aerial photography program. Includes information on ordering NAIP imagery.

USGS Global Visualization Viewer
Use this site to view Landsat 7 and Landsat 4/5 browse images of areas through out the world. Although similar to, this web site is very easy to use and allows users to add map layers to the browse images.

USGS National Aerial Photography Program (NAPP)
Information regarding this federal aerial photography program through the USGS.

Visible Earth [NASA]
A catalog of NASA images and animations.

Wisconsin Catalog of Aerial Photography
"This catalog is the most complete record of aerial photography in Wisconsin to date, containing information for over 3,000 projects."

[Wisconsin Department of Transportation] Aerial Imagery
"The Wisconsin Department of Transportation (WisDOT) Surveying and Mapping Section has recent and historical black and white vertical aerial imagery of the entire state of Wisconsin to assist in the design of highways and other transportation improvements. This aerial imagery is available for purchase through WisDOT Surveying and Mapping Section."

"WisconsinView is dedicated to building a remote sensing community in Wisconsin that provides citizens easy online access to federal imagery data products. WisconsinView is supported by USGS federal funding through the AmericaView Inc. Consortium."

World Wide InfraRed Composite
Displays an Infrared composite of the earth's surface.

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3D Nature
Landscape design and visualization software, including Visual Nature Studio and World Construction Set.

This site is the Autodesk information portal for design professionals.

Blue Marble Geographics
A geographic software site that offers calculators, translators, development tools, extensions, etc.

ESRI GIS and Mapping Software
The maker of ArcGIS products - this site contains information on products, training and support, and much more. (TeleAtlas)
Internet geocoding services and EZ-Locate software. Requires a user account.

Geoscape Intelligence System [LatinForce]
Modules especially suited for business and marketing applications.

GEospatial Applications Registry (GEAR)
"GEAR is a simple, lightweight, and useful place that offers centralized access to geospatial software solutions and enables users to share their experiences with specific applications. The primary objective of this registry is to extend users an “equal opportunity” for obtaining information about geospatial software applications."

GRASS is open source GIS software. Download software and source code from their site.
Find data or software that addresses your 3D Analysis, mapping/GIS, and database needs.

MapWindow GIS
MapWindow GIS desktop software is a free, open source GIS product.

Quantum GIS
Quantum GIS is a free, open source software package downloadable from their site.

Software (Freeware) and Related Files
Free programs to convert TIGER files to shapefiles (TGR2SHP) and KML files (TGR2KML), digital line graphs to shapefiles (DLG2SHP) and Census data to tables.

A GIS consultant and software provider site that offers useful ArcView extensions and other products.

Open source desktop Internet GIS software downloadable for free.

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Soil Data Mart [USDA-NRCS]
Information page on U.S. Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) soil tabular and spatial data. Also included are links to the Web Soil Survey and Geospatial Data Gateway for downloading soils datasets. See also the home page of the Soil Survey Geographic (SSURGO) Database for more information.

U.S. General Soil Map (STATSGO2)
The State Soil Geographic (STATSGO) Database is now called the U.S. General Soil Map. This map is available for download through the Soil Data Mart.

Web Soil Survey [USDA-NRCS]
"Web Soil Survey (WSS) provides soil data and information produced by the National Cooperative Soil Survey. It is operated by the USDA Natural Resources Conservation Service (NRCS)....NRCS has soil maps and data available online for more than 95 percent of the nation’s counties."

Wisconsin Online Soil Survey Manuscripts [USDA-NRCS]
Soil Survey Manuscripts in PDF format can be downloaded for several Wisconsin counties.

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Topography / Elevations

Digital Raster Graphics (DRGs) [Wisconsin Dept. of Natural Resources]
View or download Digital Raster Graphics (DRGs) (also known as topographic maps) for the State of Wisconsin as acquired from USGS and enhanced by the Wisconsin DNR.

Earth Resources Observation and Science (EROS) Data Center
Access to aerial photographs, digital elevation models, digital raster graphics, satellite imagery, and land cover data.

Large Scale Digital Line Graphs for Wisconsin (USGS Geographic Data Download)
Large Scale DLGs of Wisconsin available for download (.ddf file format).

National GIS Data Sets [U.S. Fish and Wildlife Service]
A central location for access to downloadable data from the: National Atlas of the United States; National Elevation Dataset; National Hydrography Dataset; National Land Cover Database and MRLC; USGS Water Resources Division Data; and Census Bureau Cartographic Information.

SRTM 90m Digital Elevation Data [CGIAR-CSI]
Shuttle Radar Topographic Mission (SRTM) digital elevation data have been further processed to fill in data gaps and is available for download. This project is funded by the Consultative Group on International Agricultural Research Consortium for Spatial Information(CGIAR-CSI). The original data is available free of charge from the National Map Seamless Data Distribution System.

TopoZone (
Subscribing to gives you access to topo maps, trail guides, air photos, weather information and more.

USGS Digital Elevation Models (DEM) [GIS Data Depot]
Download DEMs as well as programs to convert the SDTS file format to ESRI format and others. Also has articles and resources related to DEMs.

USGS Geographic Data Download
These data sets -- DEMs, DLGs, NEDs, LULC, NHDs, and more -- are for use in geographical information systems (GIS) for analysis and integration with other geospatial data.

USGS Store
Topo maps and other types of maps, as well as reports, books and other products are for sale.

USGS Store - Map Locator
Interactive map provides index of topographic quadrangle sheets. Sheets (with medium resolution) can also be downloaded for free.

USGS Topographic Quadrangle Images [Montana State Univ.]
Download 1:24,000 MrSid geo-referenced DRG maps from this site or browse the maps using an applet GIF viewer. Covers the state of Montana.

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National Transportation Atlas Database (NTAD) [Bureau of Transportation Statistics]
Downloadable datasets from NTAD, which is also available on DVD. Includes tranportation facilities and networks as well as boundaries, natural features and environmental datasets.

TIGER, TIGER/Line and TIGER-Related Products [U.S. Census]
Topologically Integrated Geographic Encoding and Referencing (TIGER) system files, including census boundaries, roads and rail lines, are available for download.

Traffic Counts [Wisconsin Dept. of Transportation]
Traffic count maps are available for Wisconsin counties and cities in PDF format.

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ESRI Training and Education
Self-paced GIS training on the web. Offers courses using ESRI products such as ArcView, Avenue, and ARC/INFO.

Sistemas de información Geográfica y Cartográfica
This site contains many messages about GIS programs/courses in Spanish. It is also an excellent LISTSERV, based in Spain with numerous Latin American subscribers.

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Updated October 13, 2008

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