[gdal-dev] An error in building overviews for

Frank Warmerdam warmerdam at pobox.com
Fri Nov 12 11:02:55 EST 2010

Zhenyu Lu wrote:
> Hi, Even:
> I have used the tool you mentioned. There is a gdaladdo utility in 
> GDAL1.5.2. But still it didn't work with the .img file in my computer.
> Then I realized that since I've used these .img files in ArcGIS and 
> Erdas before. These software must automatically create the .rrd files. 
> That explains why I can't use the following code 
> "dataset.BuildOverviews("NEAREST", pOverviewList);". 
> It turns out to be that the reason why the ".tif" file works using the 
> previous code is because there is a .aux file together with the .rrd 
> file. It seems that the .aux file can be both read and written. 
> Thanks a lot for all the help and information.


Indeed this is likely to be a situation where the behavior is confusing.  It
may well be better handled with the most recent code.  If you find things
still do not seem to work in a reasonable way with the current (trunk) code
please feel free to file a bug report.

Best regards,
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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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