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  2. GTOPO30 - Wikipedia

    en.wikipedia.org/wiki/GTOPO30

    GTOPO30 is a digital elevation model for the world, developed by United States Geological Survey (USGS). It has a 30-arc second resolution (approximately 1 km), [1] and is split into 33 tiles stored in the USGS DEM file format. According to DTED and USGS DEM the absolute vertical accuracy of GTOP30 varies from ±30 meters. [2]

  3. OpenStreetMap - Wikipedia

    en.wikipedia.org/wiki/OpenStreetMap

    OpenStreetMap (abbreviated OSM) is a free, open map database updated and maintained by a community of volunteers via open collaboration. [4] Contributors collect data from surveys, trace from aerial photo imagery or satellite imagery, and import from other freely licensed geodata sources.

  4. Google Earth - Wikipedia

    en.wikipedia.org/wiki/Google_Earth

    Google Earth is a web and computer program that renders a 3D representation of Earth based primarily on satellite imagery.The program maps the Earth by superimposing satellite images, aerial photography, and GIS data onto a 3D globe, allowing users to see cities and landscapes from various angles.

  5. Digital elevation model - Wikipedia

    en.wikipedia.org/wiki/Digital_elevation_model

    Maps-for-free.com; Geo-Spatial Data Acquisition Archived 2013-08-22 at the Wayback Machine; Elevation Mapper, Create geo-referenced elevation maps; Data products. Satellite Geodesy by Scripps Institution of Oceanography; Shuttle Radar Topography Mission by NASA/JPL; Global 30 Arc-Second Elevation (GTOPO30) by the U.S. Geological Survey

  6. GIS file format - Wikipedia

    en.wikipedia.org/wiki/GIS_file_format

    USGS DEM – The USGS' Digital Elevation Model GTOPO30 – Large complete Earth elevation model at 30 arc seconds, delivered in the USGS DEM format; DTED – National Geospatial-Intelligence Agency (NGA)'s Digital Terrain Elevation Data, the military standard for elevation data; World file – Georeferencing a raster image file (e.g. JPEG, BMP)

  7. List of street view services - Wikipedia

    en.wikipedia.org/wiki/List_of_street_view_services

    Google Street View is the most comprehensive street view service in the world. It provides street view for more than 85 countries worldwide. Bee Maps, powered by Hivemapper is the fastest growing mapping company in the world, mapping 29% of the world (until November 2024).