Search results
Results From The WOW.Com Content Network
GADM, the Database of Global Administrative Areas, is a high-resolution database of country administrative areas, with a goal of "all countries, at all levels, at any time period." [ 2 ] Although it is a public database, GADM has a higher spatial resolution than other free databases, [ 3 ] and also higher than commercial software such as ArcGIS ...
The GAUL always maintains global geographic layers (in shapefile format) with a unified coding system at the levels of country, first administrative (e.g. regions), and second administrative (e.g. districts). In addition, when data is available, it provides layers on a country-by-country basis down to third, fourth and lower levels.
U.S. Gazetteer, TIGER/Line shapefiles, census data. National Historical Geographic Information System: NHGIS provides free of charge, aggregate census data and GIS-compatible boundary files for the United States between 1790 and 2012. Atlas of Historical County Boundaries Project (AHCBP)
Shapefiles : are a data exchange format created by ESRI and one of the most widely used GIS/geodata formats. One "shapefile" usually include four different files : .shp, .shx, .dbf, .prj. First three files must all be present in order to use the data. Each shapefile can hold only one geometry type.
Administrative Boundary CODs are baseline geographical datasets that are used by humanitarian agencies during preparedness and response activities. They are preferably sourced from official government boundaries but when these are unavailable the information management network must develop and agree to a process to develop or adopt an alternate ...
The shapefile format is a geospatial vector data format for geographic information system (GIS) software. It is developed and regulated by Esri as a mostly open specification for data interoperability among Esri and other GIS software products . [ 1 ]
Common reference layers include government administrative boundaries, roads, cities, a latitude/longitude graticule, or even terrain. These layers play a secondary role in the use of the map, so they are usually included sparingly, and symbolized to be low in the visual hierarchy, but not so faded that they cannot be used. [5]: 64
In 2008, data in shapefile format was published. Please note that shapefiles are not topological, therefore may create slivers when comparing TIGER/Line boundaries. This mismatch was not possible when the census TIGER files were available in ASCII format that was topological unlike shapefiles.