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Arizona Resources

AZGEO Clearinghouse: Catalog of Arizona GIS data that have been collected from various state and local agencies and organizations.
ADHS Community Profiles Dashboard: Maps, tables, and downloadable data created by the Arizona Department of Health Services (ADHS).
ADWR GIS Data and Maps: Downloadable GIS datasets created by the Arizona Department of Water Resources (ADWR).
Arizona State Land Department (ASLD) Parcel Viewer: Interactive map with information on land parcels managed by the Arizona State Land Department (ASLD).
HabiMap Arizona: Interactive map with wildlife data collected by the Arizona Game and Fish Department (AzGFD). Map requires Adobe Flash Player.
MAG Map Viewers: Links to multiple county and statewide interactive maps maintained by the Maricopa Association of Governments (MAG).
UofA DroughtView: Web map to visualize the impacts of drought on Arizona.
UofA Spatial Data Explorer: Searchable catalog of geospatial datasets held by the University of Arizona Library.

Other State Resources

California Geoportal: Maps and data for California.
California Open Data Portal: Open geospatial datasets for California.
Colorado Open Data Catalog: Open geospatial datasets for Colorado.
ColoradoView: Access to remotely-sensed imagery for Colorado.
Denver Regional Data Catalog: Open geospatial datasets for the Denver, CO area.
New Mexico RGIS: New Mexico's geospatial data clearinghouse.
Utah Automated Geographic Reference Center: The Automated Geographic Reference Center (AGRC) is Utah's geospatial data repository.

Nationwide Resources

Data.Gov: Federal open data repository. Includes geospatial datasets.
FCC Maps: Federal Communications Commission (FCC) maps, including information on broadband deployment.
USFS FSGeodata Clearinghouse: Geospatial data clearinghouse for the US Forst Service.
Microsoft Open Data US Building Footprints: Open source dataset of over 100 million computer generated building footprints in all 50 US states.
National Geologic Map Database MapView: View and download publications regarding geological datasets.
National Historical Geographic Information System (NHGIS): Source of current and historical census data.
USGS National Map: Collection of various datasets from the USGS and various other agencies.
USGS ScienceBase Catalog: A collaborative scientific data and information management platform.

Cartography Resources

ColorBrewer: Useful site for finding map color combinations.
NAPSG Symbol Library: Downloadable symbols for creating incident maps
Visualizing Map Projections: Large image that allows users to quickly see the differences between various map projections.