Last modified by Tuan Le on 2019/05/21 13:17
From version 1.1 >
edited by Tuan Le
on 2019/05/21 13:10
To version < 3.1
edited by Tuan Le
on 2019/05/21 13:17
Change comment: There is no comment for this version

Summary

Details

Page properties
Content
... ... @@ -1,0 +1,6 @@
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.
2 +
3 +(% style="text-align:center" %)
4 +[[image:2\. Terminology.3\.3\. Datasets.WebHome@DEM.JPG||height="274" width="550"]]
5 +
6 + Example of the topographic data from the Shuttle Radar Topography Mission (SRTM).