[GRASS-user] [GRASSLIST:1208] Re: rrd files and r.in.gdal

[Frank Warmerdam]

Kirk Wythers wrote:
> 
> On Jul 27, 2007, at 9:13 AM, Frank Warmerdam wrote:
> 
>> Kirk Wythers wrote:
>>> Does r.in.gdal use the rrd files (the ones that build pyramids to 
>>> speed up viewing) when importing img files? A bunch of land cover 
>>> images that I downloaded came with rrd files (in addition to the 
>>> imgs, and I'm trying to figure out if grass uses them).
>>
>> Kirk,
>>
>> r.in.gdal does not exactly import overviews from any of it's input 
>> formats.
>> However, GDAL does support overviews in Imagine files (.rrd files) so if
>> you tried to import a big imagine files withoverviews into a low 
>> resolution
>> location r.in.gdal would pull from an overview to speed up the import.
> 
> Thanks Frank,
> 
> Does r.in.gdal know to do that automagically (as long as the rrd files 
> are in the same directory as the img files)? or is there a flag that 
> needs to be set on the import?

Kirk,

It is automatic as is the nature of GDAL for this sort of thing.

Best regards,
-- 
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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
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and watch the world go round - Rush    | President OSGeo, http://osgeo.org