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Before the end of the same year, a 1-arc second global digital elevation model (30 meters) was released. Most parts of the world have been covered by this dataset ranging from 54°S to 60°N latitude except for the Middle East and North Africa area. [17] Missing coverage of the Middle East was completed in August 2015. [19]
Viewfinderpanoramas Digital Elevation Model (DEM) repository: Global digital elevation model data maintained by Jonathan de Ferranti. Major areas of coverage includes: Asia, North America, South America, Alps, North, Other Europe, Africa, Antarctica, others. [8] CHELSA Climatologies at high resolution for the earth's land surface areas
WorldWind uses digital elevation model (DEM) data collected by NASA's Shuttle Radar Topography Mission (SRTM), National Elevation Dataset (NED) and Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER). This means one can view topographic features such as the Grand Canyon or Mount Everest in three dimensions.
DTED (or Digital Terrain Elevation Data) is a standard of digital datasets which consists of a matrix of terrain elevation values, i.e., a Digital Elevation Model.This standard was originally developed in the 1970s to support aircraft radar simulation and prediction.
A digital elevation model (DEM) or digital surface model (DSM) is a 3D computer graphics representation of elevation data to represent terrain or overlaying objects, commonly of a planet, moon, or asteroid. A "global DEM" refers to a discrete global grid.
Standards for digital elevation models, U.S. Department of the Interior, U.S. Geological Survey, National Mapping Division (1992): Part 1: General (1992) Part 2: Specifications (1995) Part 3: Quality control (1992) Errata and changes (1998) Sources for USGS DEMs: Canadian Digital Elevation Data, Level 1
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]
Digital elevation models (DEM) were also compiled, initially from topographic maps and stereographic interpretation of aerial photographs and then from satellite photography and radar data. Since all these were government projects funded with taxes and not classified for national security reasons, the datasets were in the public domain and ...