Wiki source code of 3.4.3. Digital elevation model
Last modified by Tuan Le on 2019/05/21 13:17
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| 1 | A [[**Digital Elevation Model** >>url:https://en.wikipedia.org/wiki/Digital_elevation_model]](DEM) is a 3D computer graphics representation of a terrain's surface – commonly of a planet (e.g. Earth), moon, or asteroid – created from a terrain's elevation data. A DEM can be represented as a raster (a grid of squares, also known as a heightmap when representing elevation) or as a vector-based triangular irregular network (TIN). The TIN DEM dataset is also referred to as a primary (measured) DEM, whereas the Raster DEM is referred to as a secondary (computed) DEM. The DEM could be acquired through techniques such as photogrammetry, lidar, IfSAR, land surveying, etc. | ||
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| 3 | (% style="text-align:center" %) | ||
| 4 | [[image:2\. Terminology.3\.3\. Datasets.WebHome@DEM.JPG||height="274" width="550"]] | ||
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| 6 | Example of the topographic data from the Shuttle Radar Topography Mission (SRTM). |