[GRASS-dev] [GRASS GIS] #2820: v.surf.idw results seem seriously wrong and don't match r.surf.idw results

[GRASS GIS]

#2820: v.surf.idw results seem seriously wrong and don't match r.surf.idw results
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  Reporter:  lrntct   |      Owner:  grass-dev@…
      Type:  defect   |     Status:  new
  Priority:  blocker  |  Milestone:  7.0.3
 Component:  Vector   |    Version:  7.0.1
Resolution:           |   Keywords:  v.surf.idw r.surf.idw interpolation
       CPU:  x86-64   |   Platform:  Linux
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Comment (by mlennert):

 Replying to [comment:5 mlennert]:
 > The result is quite unambiguous:
 >
 >
 > {{{
 > cat|idw_vect|idw_rast|owncal
 > 1|1545.09361138162|1388.6|1389.27
 > }}}
 >
 > i.e. the calculated value is almost exactly identical to the r.surf.idw
 result, while the v.surf.idw result is very far off.
 >

 Using the '-n' flag in v.surf.index seems to solve the issue at least
 partly: the value for the above point is now 1421, i.e. much closer to the
 r.surf.idw and the calculated result (although still significantly
 different).

 More exploration needed...

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Ticket URL: <http://trac.osgeo.org/grass/ticket/2820#comment:6>
GRASS GIS <https://grass.osgeo.org>