[gdal-dev] ERDAS RRD format for overviews

[Armin Burger]

Hi all

I would like to create ERDAS Imagine compliant overview files for a 
larger satellite archive (mainly GeoTIFF files) in an automated way. The 
"gdaladdo" tool has the possibility of defining this with "--config 
USE_RRD YES". But this writes out not the typical ERDAS *.rrd files but 
adds the overviews into an *.aux file instead. This is not recognized 
properly by Erdas or ArcGIS. Just renaming the *.aux file to *.rrd does 
not fully work since Erdas complains and spits out some error messages 
(it opens the files after that, though).

Are there any plans to implement the plain *.rrd output and leave the 
*.aux file for the typical usage of Erdas/ArcGIS for storing other 
parameters like histograms etc? I guess the format change between the 
plain *.rrd and the *.aux is very low, proably the aux file adds some 
additional header lines or something like that.

Best regards

Armin