[talk-au] Accessing landcover/trees
61sundowner at gmail.com
Fri Feb 15 03:44:37 UTC 2019
On 15/02/19 14:29, Andrew Harvey wrote:
> You'll probably run into limits using the Overpass API to extract
> large amounts of data.
> I'd recommend osmium as it's very fast. Here's an example using it to
> filter data by tags
> So once you have an extract
> http://download.openstreetmap.fr/extracts/ you'd run
> osmium tags-filter australia.osm.pbf wr/natural=wood wr/landuse=forest
> wr/landcover=trees -o wooded-areas.osm.pbf
> "wr" means both ways and relations, which should pick up the one you
> found mapped as a relation.
There are many of the larger tree areas tagged as relations, only way to
put holes in them. Just added some 3 for the Grampians rather than have
the entire national park tagged as trees.
> Then you can export to GeoJSON with osmium export
> osmium export wooded-areas.osm.pbf -o wooded-areas.geojson
> PS. Big fan of your weather tweets on Twitter!
> On Fri, 15 Feb 2019, at 1:34 PM, Andrew Miskelly wrote:
>> Hi folks,
>> I'm trying to get hold of polygons for areas in Australia which are
>> "wooded" using Overpass but I don't seem to be able to get
>> comprehensive data. Combinations of landcover, landuse, natural etc.
>> queries only return a subset of actual wooded areas.
>> The polygons are rendered at https://www.openstreetmap.org/ but when
>> I attempt to query them nothing relevant comes back (see the screen
>> shot at https://anero.id/shared/20190215021156_1.jpg).
>> Does anyone know how to retrieve these generic wooded area polygons?
>> Thanks and regards,
>> Talk-au mailing list
>> Talk-au at openstreetmap.org <mailto:Talk-au at openstreetmap.org>
> Talk-au mailing list
> Talk-au at openstreetmap.org
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