On 09-03-17 11:03, Bernd Vogelgesang wrote:
Am 09.03.2017, 08:28 Uhr, schrieb Neumann, Andreas <[email protected]>:
Hi Hilpers,
Is this about label and symbol backgrounds?
We have a QEP about that (see
https://github.com/qgis/QGIS-Enhancement-Proposals/issues/63) and
an offer from Oslandia.
Can you please review this QEP and let us know if it matches your
needs?
If yes - would you be able to contribute financially? It is quite
complex to implement this and I have to collect around 18k € to
finance it. So I would be interested in financial contributions.
Thank you for your reply,
Andreas
Hi Andreas,
as I understood the feature request, he means a "real" mask that is
not only masking the display, but all features outside of the mask for
any geoprocessing.
I faintly rember this from ArcGIS which I didn't use for ages, so I
have no idea how well this is working how its done technically.
But the idea, that when working with numerous layers of different
extent, not to have to crop them them each individually to fit into a
window of interest, but just to assign a mask layer/bbox to them,
sounds very good to me.
This sounds like the mask (r.mask) in GRASS GIS and region (g.region)
functionality (limits raster operations to defined bbox, amongst
others), which both are indeed incredible useful functions. If you want
to use this for geoprocessing in QGIS, you can try it out using the
GRASS toolbox. The mask function is also available in the processing
toolbox (r.mask.rast; never tried out how this works though). Note that
r.mask and g.region both only work for rasters. A similar functionality
for vector layers would be great, but perhaps more complicated to
implement (I guess internally it would still use a mask to cut out the
desired area / region).
Cheers
Bernd
On 2017-03-08 21:08, hilpers wrote:
Hello everyone,
I regularly face the issue that I want to set masks for layers of
my choice
based on one layer´s geometry.
I know there is a plugin available which handles labels *but not* the
geometry of layers to be masked.
In my oppinion a mask should make geometries / raster cells
outside the
specified mask disappear. The user should also be able to exclude
layers
from being masked. After searching for more than a year, I want
to ask how
you handle this pretty common scenario. Furthermore, four years
after the
last discussion about masks here on QGIS Nabble I also want to
ask, whether
developers are planning to incorporate this feature in V3.
It would be great to have that masking capability option within
the layer
options or even the projects settings.
Thanks
--
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Bernd Vogelgesang
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