[GRASS-dev] [GRASS GIS] #2218: r.stream.order: lack of documentation for flow_accum column in attribute table

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1

#2218: r.stream.order: lack of documentation for flow_accum column in attribute
table
---------------------------------------+------------------------------------
Reporter: mlennert | Owner: grass-dev@…
     Type: defect | Status: new
Priority: normal | Milestone: 6.4.4
Component: Addons | Version: unspecified
Keywords: r.stream.order flow_accum | Platform: Unspecified
      Cpu: Unspecified |
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In NC data set:

{{{
g.region rast=elevation
r.watershed elevation thresh=10000 accum=accum
r.stream.extract elevation="elevation" threshold=10000 stream_rast=streams
direction=dir
r.stream.order streams=streams dirs=dir vector=stream_order elev=elevation
accum=accum
}}}

stream_order attribute table now contains a column 'flow_accum'. There is
no mention of this column in the man page. What exactly do the numbers in
that column represent ?

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2218&gt;
GRASS GIS <http://grass.osgeo.org>

2

#2218: r.stream.order: lack of documentation for flow_accum column in attribute
table
--------------------------+----------------------------------------
  Reporter: mlennert | Owner: Madi
      Type: defect | Status: new
  Priority: normal | Milestone: 7.0.0
Component: Addons | Version: svn-releasebranch70
Resolution: | Keywords: r.stream.order, flow_accum
       CPU: Unspecified | Platform: Unspecified
--------------------------+----------------------------------------
Changes (by neteler):

* cc: grass-dev@… (added)

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2218#comment:3&gt;
GRASS GIS <http://grass.osgeo.org>

3

#2218: r.stream.order: lack of documentation for flow_accum column in attribute
table
--------------------------+----------------------------------------
  Reporter: mlennert | Owner: grass-dev@…
      Type: defect | Status: new
  Priority: normal | Milestone: 7.0.0
Component: Addons | Version: svn-releasebranch70
Resolution: | Keywords: r.stream.order, flow_accum
       CPU: Unspecified | Platform: Unspecified
--------------------------+----------------------------------------
Changes (by madi):

* owner: Madi => grass-dev@…

Comment:

fwiw, I made some manual calculations in order to establish what the
column 'flow_accum' represents. My hypothesis was that it represented the
difference between the value of flow accum in the node downstream minus
the accum in the node upstream. But my hypothesis was not verified,
although the magnitude is comparable. If someone has better ideas I'm
ready to test. Thanks

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Ticket URL: <https://trac.osgeo.org/grass/ticket/2218#comment:4&gt;
GRASS GIS <http://grass.osgeo.org>