Hi, If the clipping operations takes too much time, you could try a spatial query. Once you have a field with the states for each building, then you can split the file with that field. This may, or may not be faster. Maybe also be a problem with building sitting on the border.
Nicolas Cadieux > Le 21 oct. 2020 à 20:28, Nyall Dawson <nyall.daw...@gmail.com> a écrit : > > On Thu, 22 Oct 2020 at 10:23, Nyall Dawson <nyall.daw...@gmail.com> wrote: >> >>> On Thu, 22 Oct 2020 at 10:15, <i...@jcis.net.au> wrote: >>> >>> Nyall, >>> >>> Thanks for your quick reply. Would I load it first and then save the layer >>> as a geopackage to do that? Or do I have to do something more elaborate? >> >> I'd do it from the QGIS browser panel -- right click on the geojson >> file and save as. > > Just to clarify -- that's the "export" option, not "save as". > > Nyall > > That'll save some of the initial time required to >> load this into QGIS. >> >> (alternatively the fastest way to convert would be to use ogr2ogr >> directly from the command line, if you're comfortable with that!) >> >> Nyall >> >>> >>> Cheers >>> >>> Dr Iain Stuart >>> JCIS Consultants >>> P.O. Box 2397 >>> Burwood North >>> NSW, 2134 >>> >>> (02) 9701 0191 >>> (0413) 380116 (m) >>> >>> -----Original Message----- >>> From: Nyall Dawson <nyall.daw...@gmail.com> >>> Sent: Thursday, 22 October 2020 10:41 AM >>> To: i...@jcis.net.au >>> Cc: qgis-user <qgis-user@lists.osgeo.org> >>> Subject: Re: [Qgis-user] clip geojason QGIS >>> >>> On Thu, 22 Oct 2020 at 09:33, <i...@jcis.net.au> wrote: >>>> >>>> It seems that Microsoft (of all people) is creating this database of >>>> building shapes for the known universe. They recently completed Australia >>>> and made it available. It is in a zipped geojason file – a format that I >>>> have no idea about. >>>> >>>> >>>> >>>> I have loaded it to QGIS and it is huge. It took over 30min to load and it >>>> takes about 10min to redraw every time and I am not running it on a >>>> Pentium 4 with 8bits of ram either. >>> >>> Convert it to a geopackage first -- geojson is a HORRIBLE format for large >>> datasets like this, as it's completely unoptimised and has no spatial >>> index. Effectively on every redraw QGIS is having to loop through the >>> entire 6gb geojson file every time! ouch.... >>> >>> Nyall >>> >>> >>> >>>> >>>> >>>> >>>> I would like to clip the data to the states of Australia which I have a >>>> vector files or maybe regions in order to get the dataset smaller so it >>>> can be more usable. >>>> >>>> >>>> >>>> Can you clip geojason files ? or would I have to covert them into >>>> something like shapefiles? Any ideas on a workflow to do this? >>>> >>>> >>>> >>>> BTW I am running an I7-8700 with 16mb RAM and a NVIDIA Quadro P2000. >>>> >>>> >>>> >>>> Cheers >>>> >>>> >>>> >>>> Dr Iain Stuart >>>> >>>> JCIS Consultants >>>> >>>> P.O. Box 2397 >>>> >>>> Burwood North >>>> >>>> NSW, 2134 >>>> >>>> >>>> >>>> (02) 9701 0191 >>>> (0413) 380116 (m) >>>> >>>> >>>> >>>> _______________________________________________ >>>> Qgis-user mailing list >>>> Qgis-user@lists.osgeo.org >>>> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user >>>> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user >>> >>> > _______________________________________________ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
