[GRASS-SVN] r72920 - grass-addons/grass7/raster/r.accumulate

[svn_grass at osgeo.org]

Author: hcho
Date: 2018-06-28 16:37:08 -0700 (Thu, 28 Jun 2018)
New Revision: 72920

Modified:
   grass-addons/grass7/raster/r.accumulate/r.accumulate.html
   grass-addons/grass7/raster/r.accumulate/r_accumulate_nc_lfp_example_multiple.png
Log:
r.accumulate: Update an example screenshot; Add a note about SFD routing

Modified: grass-addons/grass7/raster/r.accumulate/r.accumulate.html
===================================================================
--- grass-addons/grass7/raster/r.accumulate/r.accumulate.html	2018-06-28 22:31:30 UTC (rev 72919)
+++ grass-addons/grass7/raster/r.accumulate/r.accumulate.html	2018-06-28 23:37:08 UTC (rev 72920)
@@ -34,6 +34,10 @@
                    (r.watershed drainage)
 </pre></div>
 
+<p>Since the module does not use elevation data (i.e., slope), flow
+accumulation is calculated by single flow direction (SFD) routing and may not
+be comparable to the result from multiple flow direction (MFD) routing.
+
 <h3>Stream network delineation</h3>
 
 With <b>stream</b> and <b>threshold</b> options, the module will delineate
@@ -70,6 +74,7 @@
 g.region raster=elevation -p
 
 # calculate positive flow accumulation and drainage directions using r.watershed
+# for comparison, use -s (SFD)
 r.watershed elevation=elevation accumulation=flow_accum drainage=drain_directions -s -a
 
 # calculate flow accumulation using r.accumulate
@@ -111,7 +116,7 @@
 r.accumulate direction=drain_directions threshold=50000 stream=streams_new_only
 
 # use r.stream.extract, elevation, and flow_accum_new to delineate stream networks
-r.stream.extract elevation=elevation accumulation=flow_accum_new threshold=50000 stream_vector=streams direction=drain_directions_2
+r.stream.extract elevation=elevation accumulation=flow_accum threshold=50000 stream_vector=streams_extract direction=drain_directions_extract
 </pre></div>
 
 <img src="r_accumulate_nc_stream_example.png">

Modified: grass-addons/grass7/raster/r.accumulate/r_accumulate_nc_lfp_example_multiple.png
===================================================================
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