[Qgis-user] one raster from tiles

[Jacolin Yves]

Hi,

May it is possible to add an action to the clic on the index layer loaded as a 
shapefile. Each time you clic on the layer, QGIS load the raster layer...

I don't know if it ispossible to add such action.

Y.
Le Monday 21 April 2008 16:03:05 David Fawcett, vous avez écrit :
> 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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> > Qgis-user at lists.osgeo.org
> > http://lists.osgeo.org/mailman/listinfo/qgis-user



-- 
Yves Jacolin
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