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2. USGS DEM - Wikipedia

   en.wikipedia.org/wiki/USGS_DEM

   The USGS DEM format is a self-contained (single file) set of ASCII-encoded (text) 1024-byte (1024 ASCII chars) blocks that fall into three record categories called A, B, and C. There is no cross-platform ambiguity since line ending control codes are not used, and all data including numbers is represented in readable text form.

3. Digital elevation model - Wikipedia

   en.wikipedia.org/wiki/Digital_elevation_model

   An alternative free global DEM is called GTOPO30 (30 arcsecond resolution, c. 1 km along the equator) is available, but its quality is variable and in some areas it is very poor. A much higher quality DEM from the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) instrument of the Terra satellite is also freely available ...

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.

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6. Advanced Spaceborne Thermal Emission and Reflection ...

   en.wikipedia.org/wiki/Advanced_Spaceborne...

   ASTER provides high-resolution images of Earth in 14 different bands of the electromagnetic spectrum, ranging from visible to thermal infrared light. The resolution of images ranges between 15 and 90 meters. ASTER data is used to create detailed maps of surface temperature of land, emissivity, reflectance, and elevation. [1]

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