GIS Data

California Spatial Information Library: GIS base data for California (formerly Teale Data Center).

Centers for Disease Control and Prevention GIS: GATHER, Geographic Analysis Tool for Health and Environmental Research, is an online spatial data access system that provides members of the public health community and general public access to spatial data that is pertinent to the analysis and exploration of public health issues.

ESRI Data and Maps: is a set of annual map data that is included with ArcGIS software. Five DVDs contain imagery, basemaps, census data, street maps, and a host of geographic information commonly used by GIS practitioners. Note: If you are a UC Davis campus user with an ArcGIS license, you may obtain copies of the data from Software Licensing.

The Geography Network: The Geography Network provides access to a large collection of geographic data from many of the world's leading data publishers. This digital data is intended for use with geographic information system (GIS) software tools. Included are data sets that you may preview online and download immediately as well as links to many other data sets that you may acquire directly from the data publisher.

GIS Data Depot: Numerous data holdings, such as USGS 10-meter DEMs, USGS DRGs and DOQQs, and FEMA flood data, are available for free download, otherwise, data can be downloaded via the "Premium" option or written to CD-ROM.

FRAP: The California Dept. of Forestry and Fire Protection, Fire and Resource Assessment Program provides its GIS data to the public free of charge in its native format, usually ESRI ARC/INFO export format (.e00 files) or ESRI shapefile format. The majority of data is available in the Teale Albers projection.

Texas Natural Resources Information System (TNRIS): a division of the Texas Water Development Board, is the state's clearinghouse for natural resources data. TNRIS serves as a distribution center for U.S. Geological Survey maps and has numerous other map collections available for in-house use or reproduction. Digital data available through TNRIS pertain to water resources, geology, Census, and other natural resources spatial data.

USGS National Elevation Dataset (NED): has been developed by merging the highest resolution, best quality elevation data available across the United States into a seamless raster format. NED is the result of the maturation of the USGS effort to provide 1:24,000-scale Digital Elevation Model (DEM) data for the conterminous US and 1:63,360-scale DEM data for Alaska.

USDA NRCS Geospatial Data Gateway: A good data source for downloading very specific location, elevation, and soils data. It provides natural resources or environmental data at anytime, from anywhere, to anyone. The Gateway allows you to choose your area of interest, browse and select data from a catalog, customize the format, and have it downloaded or shipped on CD.

Imagery

AirPhotoUSA: 1 meter Air Photos. The software that comes with the imagery can be used in ArcView as an extension. As the user zooms to various scales the image is refreshed to stay focused to the best resolution. It is a good backdrop to parcel, street, basin, and canal data layers.

California Department of Water Resources (DWR), San Joaquin District: 4 meter Air Photos. DWR provides land use field maps for the state drawn from satellite imagery and from air photos that are flown for the department. Each county is done in turn, with most counties revisited within seven years. It is possible to get the land use vectors from DWR, as well as the air photos used to draw the field boundaries.

California Spatial Information Library: 10 meter SPOT satellite imagery for the entire state virtually free of charge to certain qualifying entities. Educational institutions can get the data for a $60.00 CD-ROM fee to cut the10 CDs included in the set.

Digital Globe: Offers data and products from existing industry sources of remote sensing and geospatial information as well as imagery from their QuickBird satellite; panchromatic resolution is 60 cm (2 feet) and multi-spectral is 2.44 meter resolution.

Google Earth: Great tool for exploring earth from your computer.

MapMart: Digital Elevation Models, 10 and 30 meter, all formats.

Satellite Imaging Corporation: Provides satellite image processing and production services including digital aerial photography, digital elevation models (DEM), remote sensing, and GIS.

GeoEye: Products include satellite data derived from the IKONOS, IRS, and LANDSAT 7 sensors, as well as aerial data from DAIS (Digital Airborne Imaging System) and Kodak's extensive archive of high-resolution urban imagery.

SRTM: NASA has announced that DEMs from the Shuttle Radar Topography Mission for the US are now available to the public through Anonymous ftp. (Note that 30 meter images of the US are available to the public, not just 90 meter data).

University of Maryland Global Land Cover Facility archives a massive amount of donated imagery, all free for download, including LANDSAT, MODIS, and other image data.

USGS Earth Explorer: 30 meter Landsat 7 images, a good source for locating features and for image processing spectral information about land cover.

USGS EROS Data Center: There are several ReadMe files explaining the data formats.

Map Collection

UC Davis Library: Home page for the UC Davis Library's extensive collection of sheet maps, with links to digital map resources and special collections such as Sanborn maps and the aerial photography collection.