[Qgis-user] one raster from tiles

[Lionel Roubeyrie]

Big thanks Yves for pointing gdal (never thinking at all for it), there's a 
special command to merge multiple tiles into one with gdal_merge.py. 
Keep gdaltindex under the pillow :-)

Le lundi 21 avril 2008, Jacolin Yves a écrit :
> Le Monday 21 April 2008 14:04:39 Lionel Roubeyrie, vous avez écrit :
> > Hi all,
> > I have several tiles rasters (geotiff) describing a large area in high
> > resolution, and generally I work on a small area, having to import all
> > tiles because they don't have explicit names (and without the possibility
> > to put them directly under a group (see a previous post), which should be
> > a great improvement).
> > Then, is it possible to extract/create a new raster for the desired area
> > with QGIS/GRASS (know it's possible with Arcmap, with difficulties) ?
> > Thanks
>
> Hi Lionel,
>
> You can use gdaltindex to create an indexof your tile in shapefile format,
> after displaying it you can show the "location" field on your map and find
> the filename of the Raster you have to load for your area.
>
> If you want to extract an area from your raster you can again use gdal [1]
> with some option to cut all data out of your area. I think you can use
> g.region to zoom into your area and then export the raster from your view
> region, after creating one main raster.
>
> I am agreeing with you for a better group management ;) May I need to
> create a new ticket? Another possibility should be that QGIS manage index
> file.
>
> Y.



-- 
Lionel Roubeyrie - lroubeyrie at limair.asso.fr
Chargé d'études et de maintenance
LIMAIR - la Surveillance de l'Air en Limousin
http://www.limair.asso.fr