[Gdal-dev] Imagine overviews option

Garrett Potts potts at cfl.rr.com
Fri Sep 16 11:20:42 EDT 2005


Hello FRank:

Thank you for the response.  I'll take a look at the option HFA_USE_RRD

Take care

Garrett
On Sep 16, 2005, at 10:36 AM, Frank Warmerdam wrote:

> On 9/16/05, Garrett Potts <potts at cfl.rr.com> wrote:
>
>> Hello Frank/All:
>>
>> I was told that you have added imagine overview building both
>> creating internal overview and for creating a .rrd file.  I didn't
>> see an option string added that could specify either method.  What is
>> the generic interface to create either option for imagine output  
>> files.
>>
>
> Garrett,
>
> By default now gdaladdo on .img file will create Imagine style
> overviews instead of a GDAL .ovr file (TIFF).  By default they are
> created in the .img file unless they will be too big in which case
> a spill file (.ige) is created.
>
> If you set the HFA_USE_RRD configuration option to YES then
> an external .rrd file will be used for the overviews instead of
> putting them right in the .img file.  Unfortunately, I did not include
> an "options list" in the BuildOverviews() methods in GDAL so there
> is no way to pass options like this into the overview building method.
> And options passed to the original file creation are not preserved
> to the point that overviews are build (which is not part of file  
> creation).
>
> Config values can be set as environment variables, on the command
> line with the --config switch, or in C using the CPLSetConfigOption()
> function.
>
> eg.
>
> setenv HFA_USE_RRD=YES
>
> or
>
> gdaladdo --config HFA_USE_RRD YES abc.img
>
> or
>
> CPLSetConfigOption( "HFA_USE_RRD", "YES" );
> ...
>
> 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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