#67: r.out.gdal type= and no-data issues
----------------------+-----------------------------------------------------
Reporter: sieczka | Owner: [email protected]
Type: defect | Status: new
Priority: critical | Milestone: 6.3.0
Component: default | Version: unspecified
Keywords: |
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If data 'type' is not specified and the input raster has nulls, r.out.gdal
picks a correct datatype automatically, but sets a bogus no-data value.
Example, in spearfish60:
{{{
r.out.gdal in=geology out=gelogy.tif
Exporting to GDAL data type: Byte
100%
WARNING: Input raster map constains cells with NULL-value (no-data). For
no-data values was used value -2147483648. You can specify nodata
value by nodata parameter.
r.out.gdal complete.
}}}
Note the bogus -2147483648 no-data value, not in Byte datatype range.
If the user specifies 'type=Byte' explicitely, r.out.gdal sets nodata to
255 by default (OK):
{{{
GRASS 6.3.svn (spearfish60):~ > r.out.gdal in=geology out=gelogy2.tif
type=Byte
Exporting to GDAL data type: Byte
100%
WARNING: Input raster map constains cells with NULL-value (no-data). For
no-data values was used value 255. You can specify nodata value
by
nodata parameter.
r.out.gdal complete.
}}}
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/67>
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