[GRASS-dev] [GRASS GIS] #649: Nonsensical results from r.resamp.interp with certain region settings

[GRASS GIS]

#649: Nonsensical results from r.resamp.interp with certain region settings
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 Reporter:  sorokine   |       Owner:  grass-dev at lists.osgeo.org
     Type:  defect     |      Status:  new                      
 Priority:  normal     |   Milestone:                           
Component:  Raster     |     Version:  6.3.0                    
 Keywords:             |    Platform:  MacOSX                   
      Cpu:  OSX/Intel  |  
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 I am resampling a raster to higher resolution using bilinear or bicubic
 methods but I am getting erroneous result.

 == Steps to reproduce and more information: ==
 {{{
 r.info rast1
 ...
  |   Type of Map:  raster               Number of Categories: 255
 |
  |   Data Type:    FCELL
 |
  |   Rows:         128
 |
  |   Columns:      256
 |
  |   Total Cells:  32768
 |
  |        Projection: Latitude-Longitude
 |
  |            N: 89:37:40.633467N    S:        90S   Res: 1:24:12.036199
 |
  |            E: 179:17:48.75E    W: 179:17:48.75E   Res: 1:24:22.5
 |
  |   Range of data:    min = 0.000000  max = 0.000000
 |
 ...

 r.region rast=rast1
 g.region nsres=0.2 ewres=0.2
 r.resamp.interp --o input=rast1 output=rast1resampled
 }}}

 rast1resampled does not look like anything close to expected.

 == Workaround ==

 Shove 3 degrees from the region before resampling:
 {{{
 g.region n=87 s=-87 w=-177 e=177
 }}}
 Resampled raster will be correct.

-- 
Ticket URL: <http://trac.osgeo.org/grass/ticket/649>
GRASS GIS <http://grass.osgeo.org>