[Qgis-user] clip geojason QGIS

[Nyall Dawson]

On Thu, 22 Oct 2020 at 09:33, <Iain at jcis.net.au> wrote:
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> 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.
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> 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



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> 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.
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> Can you clip geojason files ? or would I have to covert them into something like shapefiles? Any ideas on a workflow to do this?
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> BTW I am running an I7-8700 with 16mb RAM and a NVIDIA Quadro P2000.
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> Cheers
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> Dr Iain Stuart
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> JCIS Consultants
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> P.O. Box 2397
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> Burwood North
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> NSW, 2134
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> (02) 9701 0191
> (0413) 380116 (m)
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>
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