Hi Peter, On Tue, Aug 6, 2019 at 12:23 PM "Peter Löwe" <peter.lo...@gmx.de> wrote: > > Hi Stefan, > > thanks for the link: That's also the latest information we found so far, except for several OSGeo conference recordings (e.g. https://doi.org/10.5446/40913 https://doi.org/10.5446/40694).
GML and GMLAS are supported by GDAL 2.2+. However, in order to import GMLAS properly, some tricks are needed (interleaved reading for non-sequential layers, see https://gdal.org/drivers/vector/gmlas.html#performance-issues-with-large-multi-layer-gml-files) which are built into GRASS 7.6+. > My colleagues have ingested CityGML datasets into R, which caused issues with the vector-topology for individual buildings. That's not related to the data format, but to the content: 3D polygons. These are not supported in GRASS, when importing you need to convert the data to 2D with v.in.ogr -2, otherwise you get corrupt topology. Maybe this is also needed for R. Markus M > Also, we have to cope with significant amounts of CityGML datasets, which would require very large amounts of RAM, if the processing is done in R. Since GRASS locations are storage-effective AND GRASS handles vector topologies well, I had hoped that someone already explored this approach further :-) > > If this should be not the case (yet) we'll gladly report at one of next years FOSS4G events. > > Best, > peter > > <peter.lo...@gmx.de> > > > > Gesendet: Dienstag, 06. August 2019 um 11:13 Uhr > > Von: "Stefan Blumentrath" <stefan.blumentr...@nina.no> > > An: "Peter Löwe" <peter.lo...@gmx.de>, "grass-user@lists.osgeo.org" < grass-user@lists.osgeo.org> > > Betreff: RE: [GRASS-user] Wrangling CityGML with GRASS ? > > > > Hi Peter, > > > > Not personally... > > I would guess you would import CityGML through GDAL: > > https://3d.bk.tudelft.nl/svitalis/citygml/gdal/2017/07/24/messing-around-with-citygml-on-gdal-2.2.html > > There you can create subsets and the like... > > > > What are you planning to do with it, roughly? > > > > Cheers > > Stefan > > > > > > -----Original Message----- > > From: grass-user <grass-user-boun...@lists.osgeo.org> On Behalf Of "Peter Löwe" > > Sent: torsdag 1. august 2019 11:10 > > To: grass-user@lists.osgeo.org > > Subject: [GRASS-user] Wrangling CityGML with GRASS ? > > > > Hi list, > > > > I'm looking for information/howtos/etc. about how to deal with large CityGML data sets using GRASS. > > > > Has anybody already explored this ? > > > > Best, > > Peter > > > > <peter.lo...@gmx.de> > > > > _______________________________________________ > > grass-user mailing list > > grass-user@lists.osgeo.org > > https://lists.osgeo.org/mailman/listinfo/grass-user > > > _______________________________________________ > grass-user mailing list > grass-user@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/grass-user
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