[GRASS-dev] Re: [GRASS GIS] #398: r.watershed with MFD

[GRASS GIS]

#398: r.watershed with MFD
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  Reporter:  mmetz        |       Owner:  grass-dev at lists.osgeo.org
      Type:  enhancement  |      Status:  reopened                 
  Priority:  minor        |   Milestone:  7.0.0                    
 Component:  Raster       |     Version:  svn-trunk                
Resolution:               |    Keywords:                           
  Platform:  Unspecified  |         Cpu:  Unspecified              
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Comment (by mmetz):

 A new patch against trunk r35238 is attached, named
 r.watershed.20090107.patch

 This patch includes the following changes:

 - MFD flow accumulation is slightly improved.

 - MFD streams and basins are now equal to or better than SFD streams and
 basins (they look more natural, no slivers or rectangles). Striking
 differences are visible with elev_lid792_1m (multiplied by 1000 to get mm
 accuracy) in nc_spm_08.

 - Segmented mode is slightly faster, more noticeable with larger regions.

 - In segmented mode, the dseg routines for DCELL output maps were actually
 writing out CELL maps, not DCELL maps, changed to DCELL maps. DCELL_TYPE
 is required for LS and S factor for USLE and for flow accumulation.

 - Improved color rules for flow accumulation based on standard deviation
 and log transformation, visual output would be obsolete now. BTW, in
 visual output all cells with negative flow accumulation (offmap inflow)
 are set to zero. That's an old, existing feature.

 - In segmented mode, G_percent() in length slope determination is now
 counting up, no longer counting down (was a FIXME).

 Can you developers please test this patch? Thanks!

 Happy New Year,

 Markus M

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Ticket URL: <http://trac.osgeo.org/grass/ticket/398#comment:6>
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