[Qgis-user] Selecting rasters with vector layer
Eric Goddard
egoddard1010 at gmail.com
Mon Mar 3 14:26:07 PST 2014
Hi asher, if you go to raster -> miscellaneous, there is a menu entry
called build virtual raster catalog. You can use that to virtually mosaic
all of your ECW files. This tool creates a new file you can load in as a
raster that references all of the individual ECW files to display them
seamlessly in qgis without having to spend the time to actually mosaic all
of them together. Load the resulting vrt file into qgis using add raster
and clip the vrt to your polygon layer using raster -> extraction ->
clipper.
Eric
On Mar 3, 2014 3:53 PM, "Asher Kamiraze" <asher.kamiraze at gmail.com> wrote:
> Hi all,
>
> I have a set of more than 200 ecw rasters that I can easily load in QGIS.
> I also have a vector polygon layer which bounds an area covering a part of
> the area covered by the whole set of rasters. What I would like to do is to
> extract only, the raster which are intersected by the vector boundary. As a
> final goal, I would like to only mosaic thoses images. I did not found a
> way to easily do this in QGIS. Any idea on how to achieve this?
>
> As a workaround, I have opened only the raster intersecting the vector,
> and would like to mosaic them. However, it does not seem to be a function
> in QGIS ready to mosaic all opened (or selected) rasters. Any idea on how
> to automate the process?
>
> Hope you could help
>
> Regards
>
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