TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

A process by which water bodies show a flat and level water surface in a topographic model.  4, record 1, English, - hydrological%20flattening

Record number: 1, Textual support number: 1 CONT

Hydro-flattening is the process of creating a lidar [light detection and ranging]-derived DEM [digital elevation model] in which water surfaces appear and behave as they would in traditional topographic DEMs created from photogrammetric digital terrain models (DTMs).  5, record 1, English, - hydrological%20flattening

Record number: 1, Textual support number: 1 OBS

[A] digital elevation model (DEM) or triangulated irregular network (TIN) derived from LiDAR [light detection and ranging] data will show unpleasant and unnatural water surface due to the fact that LiDAR data does not provide natural breaklines and the elevations of water points is not uniform. Furthermore, hydrologic connectivity in water surfaces is necessary to ensure that the elevation of water surface decreases from upstream (U/S) to downstream (D/S). Therefore, the LiDAR data is hydro-flattened so that water bodies such as streams, rivers, and long reservoirs show an elevation change along their length, whereas ponds, lakes, or other cartographically polygonal water surfaces show a static water surface, consistent with their natural behavior and the surrounding topography ...  6, record 1, English, - hydrological%20flattening

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Processus grâce auquel les masses d'eau se présentent comme des surfaces planes dans un modèle topographique.  2, record 1, French, - aplanissement%20hydrologique

Record 1,  Textual support,  Spanish

Record number: 1, Textual support number: 1 DEF

Proceso por el cual las masas de agua aparecen como superficies planas en un modelo topográfico.  1, record 1, Spanish, - aplastamiento%20de%20masas%20de%20agua