[GRASS-dev] [GRASS-SVN] r60855 - grass/branches/releasebranch_7_0/raster/r.watershed/front

[Markus Neteler]

Hi Huidae,

Markus Metz is the expert here...

Best
MarkusN  (just doing a lot of backporting)


On Thu, Jun 19, 2014 at 8:21 PM, Huidae Cho <grass4u at gmail.com> wrote:
> Hi Markus,
>
> Is sink filling discouraged or just not needed and optional? My impression
> is that r.watershed produces better results with not sink filled rasters,
> but sink filling doesn't hurt much.
>
> Thanks.
> Huidae
>
>
> On Tue, Jun 17, 2014 at 1:40 PM, <svn_grass at osgeo.org> wrote:
>>
>> Author: neteler
>> Date: 2014-06-17 10:40:00 -0700 (Tue, 17 Jun 2014)
>> New Revision: 60855
>>
>> Modified:
>>
>> grass/branches/releasebranch_7_0/raster/r.watershed/front/r.watershed.html
>> Log:
>> r.watershed manual: (minor) sync with trunk
>>
>> Modified:
>> grass/branches/releasebranch_7_0/raster/r.watershed/front/r.watershed.html
>> ===================================================================
>> ---
>> grass/branches/releasebranch_7_0/raster/r.watershed/front/r.watershed.html
>> 2014-06-17 17:39:37 UTC (rev 60854)
>> +++
>> grass/branches/releasebranch_7_0/raster/r.watershed/front/r.watershed.html
>> 2014-06-17 17:40:00 UTC (rev 60855)
>> @@ -55,7 +55,8 @@
>>  values are valid elevation data.  Gaps in the elevation map that are
>>  located within the area of interest must be filled beforehand,
>>  e.g. with <em><a href="r.fillnulls.html">r.fillnulls</a></em>, to
>> -avoid distortions.
>> +avoid distortions.  The elevation map need not be sink-filled because
>> +the module uses a least-cost algorithm.
>>
>>  <p>
>>  Map of actual depressions or sinkholes in the landscape that are large
>> @@ -113,7 +114,7 @@
>>  <p>
>>  Output <b>tci</b> raster map contains topographic index TCI is
>>  computed as
>> -<tt>ln(α / tan(β))</tt> where α a is the cumulative
>> +<tt>ln(α / tan(β))</tt> where α is the cumulative
>>  upslope area draining through a point per unit contour length and
>>  <tt>tan(β)</tt> is the local slope angle. The TCI reflects the
>>  tendency of water to accumulate at any point in the catchment and the
>>
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>
>