Hi Imre, Thank you for this answer :)
The first item with Oapi is great, I wasn't aware it was possible to ask for such information. All the data I process is get from OApi and queries have to be adapted a bit to work as expected I'm not so familiar with osmtogeojson or osmium-tool but it can be useful too. Have a nice weekend, all the best François *François Lacombe* fl dot infosreseaux At gmail dot com www.infos-reseaux.com @InfosReseaux <http://www.twitter.com/InfosReseaux> 2017-04-24 17:34 GMT+02:00 Imre Samu <[email protected]>: > >With osm xml format (overpass, josm), is there any technique to get the > bounds of a given way ? > >I want to get min lat/lng and max lat/lng without processing the whole > document (which can be pretty big) > > ... Thanks in advance for any hint > > I am not sure if I understood your problem correctly, but there are some > interesting *extended osm xml formats with geometries.* > > *Overpass API* [1] has a different XML outputs: > * "out geom" : Add the full geometry to each object." > * "out bb" : Adds only the bounding box of each element to the > element." > * "out center": This adds only the center of the above mentioned bounding > box to ways and relations." > [1] https://wiki.openstreetmap.org/wiki/Overpass_API/Overpass_ > QL#Print_.28out.29 > > so this query http://overpass-turbo.eu/s/oA4 " way(24710885); out > geom; " > calculate the bb + add geometries for the nodes; > > <way id="24710885"> > *<bounds minlat="47.5082028" minlon="19.0240336" maxlat="47.5084101" > maxlon="19.0268190"/>* > <nd ref="268581277" lat="47.5082713" lon="19.0268190"/> > <nd ref="700251685" lat="47.5082049" lon="19.0265792"/> > <nd ref="700251660" lat="47.5082028" lon="19.0265032"/> > <nd ref="268583145" lat="47.5082056" lon="19.0264232"/> > <nd ref="2859100026" lat="47.5082971" lon="19.0248566"/> > <nd ref="3114752087" lat="47.5083150" lon="19.0245494"/> > <nd ref="268583146" lat="47.5083293" lon="19.0243048"/> > <nd ref="4451395635" lat="47.5084076" lon="19.0240419"/> > <nd ref="268583147" lat="47.5084101" lon="19.0240336"/> > <tag k="highway" v="residential"/> > <tag k="is_in" v="Budapest"/> > <tag k="name" v="Retek utca"/> > <tag k="oneway" v="yes"/> > </way> > > > As I know *osmtogeojson* [ https://github.com/tyrasd/osmtogeojson ] > supporting Overpass API's extended geometry output modes. > > And *osmium-tool *has a similar special command: * "osmium > add-locations-to-ways " * to create a "Node Locations on Ways" , > so it is easy to calculate the bounding box. > > <way id="123"...> > <nd ref="12" lon="3.141" lat="5.926"/> > <nd ref="13" lon="2.111" lat="1.222"/> > </way> > > more info: > * https://blog.jochentopf.com/2016-04-20-node-locations-on-ways.html > * http://docs.osmcode.org/osmium/latest/osmium-add-locations-to-ways.html > > > If the preprocessing is ok, then maybe you can use *"osmium-extract" * > to "create geographical extracts from an OSM file" and drop the > unwanted nodes ... > * http://docs.osmcode.org/osmium/latest/osmium-extract.html > * https://blog.jochentopf.com/2017-02-06-expedicious-and-exa > ct-extracts-with-osmium.html > > > best, > Imre > > > 2017-04-24 8:26 GMT+02:00 François Lacombe <[email protected]>: > >> Hi all, >> >> With osm xml format (overpass, josm), is there any technique to get the >> bounds of a given way ? >> >> I want to get min lat/lng and max lat/lng without processing the whole >> document (which can be pretty big) >> >> This would be useful to list all nodes from my db contained into that >> bounds prior to process ways. >> I want to prevent numerous queries to check if each individual node >> exists or not while importing ways, assuming that some nodes already exist >> and some other don't. >> >> The question can be extended to relations if possible >> >> Thanks in advance for any hint >> >> All the best >> Francois >> >> _______________________________________________ >> dev mailing list >> [email protected] >> https://lists.openstreetmap.org/listinfo/dev >> >> >
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