Chris Padwick wrote:
Howdy,
I’m using gdal 1.5.2. Every time I call GDALRasterBand::GetHistogram()
gdal generates a file with the same name as the image and the extension
.aux.xml. This file appears to contain a band by band image histogram
along with some other information. On subsequent calls, using the same
image, gdal appears to be finding the .aux.xml file and reading the
stats from the file rather than computing them from scratch.
I understand the rationale for the behavior but it is causing problems
for me. How can I disable creation of these files, and/or force
computation of the stats from scratch every time?
Chris,
You can disable creation of .aux.xml files entirely by setting the
GDAL_PAM_ENABLED configuration variable to the value NO. The most
common way to do this is in the environment.
eg.
set GDAL_PAM_ENABLED=NO
(on windows)
There are Compute function variants for getting band statistics, and
min/max but I can't seem to find one for histograms. There ought to
be one. If you file a ticket, I can add one in trunk if that is helpful.
Of course, you can just write your own histogram computation code.
Best regards,
--
---------------------------------------+--------------------------------------
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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