hjp85 wrote:
Hi,
I have numerous velocity raster images from an ice sheet model that I would
like to scale so that each raster has has a maximum value of 1000 and
minimum value of 0. At the moment they all have different max values
depending on what the fastest velocity of the ice sheet is at that moment in
time.
What i'm not sure on is how to construct the command. The example given is;
-scale [src_min src_max [dst_min dst_max]]
but how do you get the input range to be automatically computed (i.e.
src_min and src_max), so that i don't have to look up each one in turn?
-scale 0 1000 doesn't work for me...
Henry,
Unfortunately due to the way the -scale commandline argument is
processed you cannot allow it to autoselect the input range and still
allow you to use a non default output range.
So either you need to just use -scale and let it rescale things to 0 to 255
(and then perhaps rescale again to 0 to 1000), or you could run gdalinfo
with the -mm (min max) switch to find the maximum value in advance.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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