[GRASS-dev] [GRASS GIS] #2014: r.sun using EPSG:3031 projection gives strange results

GRASS GIS trac at osgeo.org
Mon Sep 9 03:14:57 PDT 2013

#2014: r.sun using EPSG:3031 projection gives strange results
 Reporter:  pierreroudier  |       Owner:  grass-dev@…              
     Type:  defect         |      Status:  new                      
 Priority:  normal         |   Milestone:  7.0.0                    
Component:  Raster         |     Version:  svn-trunk                
 Keywords:  r.sun          |    Platform:  Linux                    
      Cpu:  x86-64         |  

Comment(by hamish):

 Hi Pierre,

 could you try to make an artificial Gaussian surface using r.surf.volcano
 as described in ticket #498 and/or
 http://grasswiki.osgeo.org/wiki/R.sun#Testing ?

 it helps make the issues obvious.

 do you know of a readily available DEM of the area we could test with?
 (~169E, 73.5S ?)

 draping the sunlight over the DEM in NVIZ can help.

 direct rad only? what's the exact r.sun command line used?

 what happens if you try another custom polar stereographic with +lon_0=170
 as "up"?
 and then +lon_0 as 90E or 90W for "up"? or a custom local tmerc centred on
 your study site?


Ticket URL: <https://trac.osgeo.org/grass/ticket/2014#comment:3>
GRASS GIS <http://grass.osgeo.org>

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