[GRASS-dev] [GRASS GIS] #1740: r.watershed: multiple outlets points at once for watershed delineation

[GRASS GIS]

#1740: r.watershed: multiple outlets points at once for watershed delineation
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 Reporter:  hzambran               |       Owner:  grass-dev@…              
     Type:  enhancement            |      Status:  new                      
 Priority:  normal                 |   Milestone:  7.0.0                    
Component:  LibRaster              |     Version:  unspecified              
 Keywords:  r.watershed, consider  |    Platform:  All                      
      Cpu:  Unspecified            |  
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 I consider the 'r.watershed' a very efficient function for watershed
 delineation, in particular after the changes introduced in Grass7
 (http://lists.osgeo.org/pipermail/grass-user/2012-April/064500.html).
 However, there is a feature that I'm missing in order to start using it as
 a replacement of similar functionality available in TauDem5
 (http://hydrology.usu.edu/taudem/taudem5.0/):

 The possibility of providing, in addition to the DEM file, an optional
 shapefile with the known locations of the desired outlet point(s), in
 order to be able to define the watersheds not only by using a threshold
 for the upstream area, but also by using the location of all the outlet
 points present in the main study area.

 It would be great if you could consider implementing such a feature for
 the official release of Grass7.

 This feature should be able to:

 -) move all the outlet points provided by the user to nearest cell
 belonging to the river network.
 -) apply the current 'r.watershed' to each one of the outlets points
 obtained in the previous step.


 Thanks in advance for considering this.

 Mauricio Zambrano-Bigiarini

 PS,
 More info about how TauDem5 perform this on:
 http://hydrology.usu.edu/taudem/taudem5.0/TauDEM5DelineatingASingleWatershed.pdf

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Ticket URL: <http://trac.osgeo.org/grass/ticket/1740>
GRASS GIS <http://grass.osgeo.org>