GRASS GIS wrote:
#73: r.out.gdal tiff output does not work
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Reporter: helena | Owner: grass-dev@lists.osgeo.org
Type: defect | Status: new
Priority: critical | Milestone: 6.4.0
Component: Raster | Version: svn-trunk
Resolution: | Keywords: r.out.gdal, tiff
Platform: Unspecified | Cpu: Unspecified
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Comment (by hamish):
my 2c o'today,
...
* exit with an error if user supplied nodata= is outside of range for the
given type. if no value is given use the following rules:
- signed int types: minimum in range
- unsigned int types: maximum in range
- all floating point: IEEE's NaN
Problem with NaN? According to IEEE 754, x == y is always FALSE if
either x or y or both are NaN. Assuming (nodata =
GDALGetRasterNoDataValue()) == NaN, then going through all cells if
(cell == nodata) will always be FALSE, nodata cells may not be detected?
Depends on each implementation of nodata detection? Can be solved for
GRASS, but how is this done in all other GIS applications?
Markus M
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