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Climate web viewer containing accessible climatic information from 1901 that can be downloaded in a variety of GIS formats. HydroSHEDS: Global hydrological data based on the SRTM elevation data. Includes river networks, watershed boundaries, drainage directions, and flow accumulations. USGS Land Cover Institute
The shapefile format is a digital vector storage format for storing geographic location and associated attribute information. This format lacks the capacity to store topological information. The shapefile format was introduced with ArcView GIS version 2 in the early 1990s. It is now possible to read and write geographical datasets using the ...
The Geospatial Data Abstraction Library (GDAL) is a computer software library for reading and writing raster and vector geospatial data formats (e.g. shapefile), and is released under the permissive X/MIT style free software license by the Open Source Geospatial Foundation.
QGIS supports shapefiles, personal geodatabases, dxf, MapInfo, PostGIS, and other industry-standard formats. [5] Web services, including Web Map Service and Web Feature Service, are also supported to allow use of data from external sources. [6] QGIS integrates with other open-source GIS packages, including PostGIS, GRASS GIS, SAGA GIS, and ...
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.
The data behind ArcIMS is usually stored in Shapefile format (an open specification) or in an ArcSDE RDBMS database. The Data Delivery Extension (DDE), an extension to the ArcIMS product, delivers data to users in a data format and coordinate system of their own choosing, in order to have access to data in a format compatible with their local ...
This was most common from the 1970s through the early 1990s, because GIS software developers had to invent their own geometry data structures, but incorporated existing relational database file formats for the attributes. For example, the Esri Shapefile format includes the .dbf file from the DOS dBase software.
OpenStreetMap (abbreviated OSM) is an online map that uses an open geographic database, updated and maintained by a community of volunteers via open collaboration. Contributors collect data from surveys , trace from aerial photo imagery or satellite imagery , and import from other freely licensed geodata sources.