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This is a list of GIS data sources (including some geoportals) that provide information sets that can be used in geographic information systems (GIS) and spatial databases for purposes of geospatial analysis and cartographic mapping. This list categorizes the sources of interest.
Currently, the best source for nationwide LiDAR availability from public sources is the United States Interagency Elevation Inventory (USIEI). [1] The USIEI is a collaborative effort of NOAA and the U.S. Geological Survey, with contributions from the Federal Emergency Management Agency, the Natural Resources Conservation Service, the US Army Corps of Engineers, and the National Park Service.
The following are approximate tallies of current listings by county. These counts are based on entries in the National Register Information Database as of March 13, 2009 [2] and new weekly listings posted since then on the National Register of Historic Places web site. [3]
Electronic Cultural Atlas Initiative (ECAI) is a clearinghouse for the exchange of metadata of Historical GIS. Maintained by the University of California, Berkeley. Euratlas History Maps is a historical atlas of Europe from year 1 to present days with one map per century. The maps depict sovereign states as well as administrative divisions and ...
From its FOIA requests, TRAC adds more than 3 billion new records to its database annually (>250 million records per month). Furthermore more than 300,000 monthly records on civil and criminal proceedings are also obtained. [16] The TRAC website consists of various subsections that list data from specific government agencies and special projects.
Pennsylvania Spatial Data Access (PASDA), [4] the official public geospatial data clearinghouse for the Commonwealth of Pennsylvania marked its 18th year in 2014. PASDA, which has grown from a small website offering 35 data sets in 1996 to the expansive user-centered data clearinghouse that it is today, has become a staple of the GIS community in Pennsylvania.
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Some states use variations of the trinomial system. Arizona, California, Connecticut, Maine, Rhode Island, and Vermont use two-letter abbreviations of the state name instead of the Smithsonian number. Alaska uses three-letter abbreviations for USGS map quadrangles in place of the county code. Arizona uses a five-part identifier based on USGS ...