#649: Nonsensical results from r.resamp.interp with certain region settings
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Reporter: sorokine | Owner: grass-dev@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.
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Ticket URL: <http://trac.osgeo.org/grass/ticket/649>
GRASS GIS <http://grass.osgeo.org>