#398: r.watershed with MFD --------------------------+------------------------------------------------- Reporter: mmetz | Owner: grass-dev@lists.osgeo.org Type: enhancement | Status: reopened Priority: minor | Milestone: 7.0.0 Component: Raster | Version: svn-trunk Resolution: | Keywords: Platform: Unspecified | Cpu: Unspecified --------------------------+------------------------------------------------- Comment (by mmetz):
Helena Mitasova and Michael Barton asked previously about backporting r.watershed with MFD to grass6. Now that develbranch_6 stays as version 6.5.svn, does someone have objections against backporting r.watershed from trunk to develbranch_6? It would be backported with the following modifications for backwards compatibility: disable MFD by default, it will be enabled with a new -f flag. I don't want to (ab)use the -s flag of trunk because it has the opposite meaning. The -s flag will be removed. RUSLE LS and S factors will again be multiplied by 100, as before. The output raster type of the LS and S factors has to be changed to DCELL though, otherwise MFD won't work, because flow accumulation needs to be of type DCELL for MFD, i.e. always, and the segmented mode uses the same function for writing out any variable of type DCELL. Previously, LS and S factor were stored as type DCELL, but both in segmented mode and in ram mode written out as type (CELL) (factor * 100). This change from CELL to DCELL can not be reverted, at the same time supporting flow accumulation output as type DCELL, without a lot of rewriting, actually more rewriting than was necessary to implement MFD support. The change from CELL to DCELL for flow accumulation and the RUSLE factors will hopefully not break scripts. I would need some help on how to properly backport the various changes from trunk to devbr6. According to the svn howto, svn merge backports one particular change if I got that right. Markus M -- Ticket URL: <http://trac.osgeo.org/grass/ticket/398#comment:8> GRASS GIS <http://grass.osgeo.org>
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