WMS:Compute Basin Data: Difference between revisions

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When the drainage coverage feature objects are used to create a hydrologic model the area of the polygons can be determined and used in any of the supported hydrologic models. If the points/vertices used to create the feature arcs also have z values associated with them then WMS will make a rough estimate of the longest flow path and slope along such a path. Finally, if the user has derived a watershed from feature objects, and also has a background DEM, the user can compute most of the basin data parameters using the following steps:
#redirect [[WMS:DEM_Basins#Compute_Basin_Data]]
 
:#[[WMS:Importing USGS DEMs|Import/Read the DEM.]]
:#[[WMS:Importing Flow Directions and Accumulations|Compute the flow directions]] using TOPAZ.
:#Use the [[WMS:DEM Basins|'''Polygon Basin IDs→DEM''']] command found in the ''DEM'' menu in the Drainage module to assign DEM cells a basin id from the feature object polygons.
:#Choose the '''Compute Basin Data''' command from the ''Feature Objects'' menu of the Map module.
 
Of course, the results will only be approximate since the actual basin boundaries will not have been derived from the computed flow direction data, but it will provide a reasonable estimate. Ideally, most users will want to derive the basin boundaries from the DEM and flow direction data and then use the [[WMS:DEM Basins|Compute Basin Data]] command in the ''DEM'' menu of the Drainage module.
 
 
==''Related Topics''==
*[[WMS:Feature Object Guidelines|Feature Object Guidelines]]
*[[WMS:DEM Basins|Computing Basin Data from DEMs]]
*[[WMS:TIN Basins|Computing Basin Data from TINs]]
 
 
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[[Category:DEM|C]]
 
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Latest revision as of 16:47, 15 January 2016