[gdal-dev] Scale and Offset, datatype and UMN MapServer
plieger at knmi.nl
Tue Aug 12 07:44:55 EDT 2008
When using a file with scale and an offset to transform 8bit BYTE raster
values into meaningful values, what happens with the datatype? I would
like to implement the scale and offset parameters in our ADAGUC netcdf4
I have seen some drivers to change the datatype to float. What happens
when translating from such a file to another file? Will the datatype be
changed to float always?
What happens with UMN MapServer in combination with such a file? I can
imagine that mapserver does not see a scale and offset parameter, but
just a raster with datatype float?
The problem is that I would like to pass the reduced BYTE raster data
with accompaning scale and offset through the Web Coverage Service of
Mapserver. I do not want to pass the unpacked float raster data.
Is there a standard and neat way to do this?
KNMI, R&D Information and Observation Technology, De Bilt
(t) +31 30 2206330
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