[GRASS-user] [GRASSLIST:1207] Re: rrd files and r.in.gdal

[Kirk Wythers]

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

>
> 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    | President OSGeo, http:// 
> osgeo.org
>