[Qgis-user] one raster from tiles

[David Fawcett]

I think that you have brought up an interesting idea though.

After getting used to the idea of being able to use a tile index for large
raster data sets in MapServer.  I have really wished that this feature
existed in desktop GIS.  In ArcGIS, you can create a raster catalog, but you
have to use a geodatabase and their 'tile index' layer doesn't give actual
footprints of the images, just the bounding boxes.

I think that it would be great to be able to use a tileindex in qGIS.

David.

On Mon, Apr 21, 2008 at 8:51 AM, Lionel Roubeyrie <lroubeyrie at limair.asso.fr>
wrote:

> 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
>
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