I'm forwarding here comments from Markus Neteler. All the best. > -------- Messaggio Inoltrato -------- > Oggetto: Re: [Qgis-developer] QGIS and GRASS 7.0.0 > Data: Tue, 24 Feb 2015 08:08:18 +0100 > Mittente: Paolo Cavallini <cavall...@faunalia.it> > Organizzazione: Faunalia > A: Pedro Venâncio <pedrongvenan...@gmail.com> > CC: qgis-developer <qgis-developer@lists.osgeo.org> > > Olá Pedro, > > Il 23/02/2015 22:06, Pedro Venâncio ha scritto: > >> Despite the great advantages of GRASS commands in Processing, I think >> that the GRASS plugin still plays an important role and is an excellent >> interface for GRASS. For those who still like to use the paradigm of >> locations, mapsets and the GRASS topological model, GRASS plugin is very >> important, because then it allows to use all QGIS tools, for example, to >> create layouts using the Composer, etc. > > Agreed. Moreover, the overhead of importing/exporting data for each step > of a complex analysis puts GRASS algs to a disadvantage for Processing > users.
The overhead is not necessarily needed in case of raster maps: #### Workflow example: # register GeoTIFF file in GRASS GIS database (no import but direct link): r.external input=tempmap1.tif output=modis_celsius # define output directory for files resulting from GRASS calculation: # i.e. GRASS GIS writes directly a GeoTIFF file here, no GRASS DB storage r.external.out directory=$HOME/gisoutput/ format="GTiff" # perform calculation (here: extract pixels > 20 deg C) and # write output directly as GeoTIFF: r.mapcalc "warm.tif = if(modis_celsius > 20.0, modis_celsius, null() )" # cease GDAL output connection and turn back to write GRASS raster files: r.external.out -r # use the result elsewhere qgis $HOME/gisoutput/warm.tif #### END Workflow example: This approach could be used in "Processing" as well. Or in a WPS context etc. > BTW, I'm unsure about the G7 support in the Browser: could someone check > thoroughly? > >> If no one is interested in making the port of the plugin for GRASS 7, we >> could try through a crowdfounding initiative. Who was behind the initial >> creation of GRASS plugin? > > Yes, I have been talking about that. Radim did most of the work on the > plugin. If he (or eventually others) are available, a crowdfounding > initiative could be appropriate. Yes, it would be great to get the plugin updated as well. >> I've been checking the differences and they are indeed few. Please see >> the spreadsheet attached. > > Obrigado for this. > >> Some commands seem that were adaptations of other algorithms, made for >> Processing, as they are not in the 6 manual, or in the 7: >> r.cost.full.raster, r.drain.coordinate, r.terraflow.short, >> v.surf.rst.cvdev.line, v.surf.rst.line, v.transform.pointsfile. > > Yes, these are adaptations of the original commands, in order to make > them more usable from QGIS. Update to GRASS GIS 7 should not be a lot of work, see below. >> Others seem that have been removed from GRASS 7 (r.average, r.bilinear, >> r.bitpattern, r.surf.idw2), as they are not in the GRASS 7 manual. It is all documented in the release notes: http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures#Replacedandremovedmodules [...] raster: - r.average: merged into G7:r.statistics, G7:r.stats.zonal, G7:r.stats.quantile - r.bilinear: merged into G7:r.resamp.interp - r.bitpattern: G7:r.mapcalc (&&& and | | | operators) + G7:i.modis.qa offer the same and more functionality [...] - r.surf.idw2: moved to Addons (install with G7:g.extension) - r.terraflow.short (merged into FP version G7:r.terraflow is sufficient) [...] >> There are five that seem important to me, which are in GRASS 7, in >> Processing GRASS 6, but not in Processing GRASS 7: r.out.xyz, r.ros, >> r.spread, r.univar, v.kernel. >> >> Finally, there are two commands that are on GRASS 7 and were not in 6: >> r.viewshed (which replace r.los) and r.relief (which replace >> r.shaded.relief). > > Overall, I think these are minor issues. If someone really miss them, > they can ask, and we can add them. I updated "Processing" accordingly, so you can see the needed changes from the changelog. Or simply here: http://trac.osgeo.org/grass/wiki/Grass7/NewFeatures#Optionschanges Best regards, Markus -- http://courses.neteler.org http://gis.cri.fmach.it/neteler/ Next GRASS GIS 7 courses: Berlin, 16 +17 March 2015 http://courses.neteler.org/next-training/ > All the best, and thanks again. > -- > Paolo Cavallini - www.faunalia.eu > QGIS & PostGIS courses: http://www.faunalia.eu/training.html > _______________________________________________ > Qgis-developer mailing list > Qgis-developer@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/qgis-developer > _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
