Hi, Actually, I would have no strong opinions about this. However, I am a bit confused...
Cause I almost never use the a-flag. In fact I use the a-flag only when I want to interpolate e.g. LiDAR point clouds to a new raster with a nice resolution. In all other cases I use the align option, when I want my data to match with the resolution of an existing raster (most of the time a terrain model). So, when I want to grab the extend from a vector map but want to keep the pixels from my DEM I do: g.region -p vector=vect_map align=rast_map For a reported Processing bug in QGIS I even suggested to drop the usage of the a-flag (which Processing used as a default): https://hub.qgis.org/issues/14582 So now I am a bit unsure if my suggestion for Processing bug #14582 was correct... I still think dropping the a-flag was correct for the processing use case ... Finally, I had a look into the g.region manual and was surprised to see that there is neither an example using the a-flag nor the align option. Would be probably worth adding this. If you agree I can come up with suggestions... And probably also the description of the a flag could be slightly reworded into e.g.: "Adjust region extent to be a multiple of the resolution (default = align to bounds, works only for 2D resolution)" (which was: "Align region to resolution (default = align to bounds, works only for 2D resolution)"). Cheers Stefan -----Original Message----- From: grass-dev [mailto:grass-dev-boun...@lists.osgeo.org] On Behalf Of Martin Landa Sent: torsdag 5. januar 2017 11.05 To: Moritz Lennert <mlenn...@club.worldonline.be> Cc: GRASS developers list <grass-dev@lists.osgeo.org> Subject: Re: [GRASS-dev] wxGUI: align to resolution by default Hi, 2017-01-05 8:30 GMT+01:00 Moritz Lennert <mlenn...@club.worldonline.be>: >>What do you think? Ma > > > See the arguments at > https://trac.osgeo.org/grass/ticket/1745 hm, I found two reasons there: 1) Using '-a' breaks that by rounding - not surprissing 2) by default GRASS should try to do the least-damaging thing Well I used -a flag everytime when setting up region based on vector and raster data. I still think that it could be default in wxGUI. In 99% you want to preserve resolution. Ma -- Martin Landa http://geo.fsv.cvut.cz/gwiki/Landa http://gismentors.cz/mentors/landa _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev _______________________________________________ grass-dev mailing list grass-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/grass-dev