On 29/06/2011 19:53, Even Rouault wrote:
Le mardi 28 juin 2011 21:32:01, Armin Burger a écrit :
Frank
a functionality that I would find useful in combination with clients
like ArcGIS or Erdas are the Erdas overviews in *.rrd files. When
creating overviews with gdaladdo using the "--config USE_RRD YES"
option, aux files instead of rrd files are created. They are not fully
recognized by ArcGis/Erdas, depending on the image format.
I'm afraid I know very little of the subtleties of Erdas overviews, but I see
that the HFA_USE_RRD config option can also be set to YES and produces a .rrd
file. Perhaps this is was you are looking for. See
http://gdal.org/frmt_hfa.html . I've found also a past thread where this is
somehow discussed : http://www.mail-archive.com/gdal-
[email protected]/msg00129.html
Even
thanks a lot for pointing me to the thread. I was not aware of this
double option
--config HFA_USE_RRD YES --config USE_RRD YES
since the documentation and the --help of gdaladdo just mention the
USE_RRD option, which puts the overview inside a single big .aux file.
It looks a bit like the small .aux file created with the 2 config
options contains also image statistics, but I will check this tomorrow
at work.
Armin
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