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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.
A geoportal is a type of web portal used to find and access geographic information (geospatial information) and associated geographic services (display, editing, analysis, etc.) via the Internet. Geoportals are important for effective use of geographic information systems (GIS) and a key element of a spatial data infrastructure (SDI).
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.
GIS data acquisition includes several methods for gathering spatial data into a GIS database, which can be grouped into three categories: primary data capture, the direct measurement phenomena in the field (e.g., remote sensing, the global positioning system); secondary data capture, the extraction of information from existing sources that are ...
Alaska portal "Cadastral Survey [Alaska]". U.S. Bureau of Land Management. Archived from the original on 2011-12-20 "Principal Meridians and Base Lines". U.S. Bureau of Land Management. Archived from the original on 2012-10-18
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 ...
A GeoPackage is defined as a SQLite 3 database file with a specific database schema and with filename extension.gpkg. [9] The schema defines data and metadata tables with specified definitions, integrity assertions, format limitations and content constraints.
The U.S. state of Alaska is divided into 19 organized boroughs and 11 census areas in the unorganized borough.Alaska, and the states of Connecticut and Louisiana are the only states that do not call their first-order administrative subdivisions counties (Connecticut uses councils of government and Louisiana uses parishes instead). [1]