Would it be possible to get the osm-community in Belgium to agree on one tagging principle for trees/wood/forest? And get it done that way?
2018-06-13 7:47 GMT+02:00 Marc Gemis <marc.ge...@gmail.com>: > On Tue, Jun 12, 2018 at 10:57 PM Mateusz Konieczny > <matkoni...@tutanota.com> wrote: > > > > > > > > > > 12. Jun 2018 13:22 by marc.ge...@gmail.com: > > > > How do people in GIS know how many square meter of forest there is in > > a country based on OSM-data ? > > > > > > I would start from something like: total area of area covered by > > > > landuse=forest and natural=wood > > > > after excluding very small areas. > > > > > > won't work, see e.g. > https://www.openstreetmap.org/search?query=waasmunster#map= > 16/51.1215/4.0932&layers=N > that's not a forest, that are a lot of private gardens with trees in it. > > > > > Is the data suited for that ? > > > > > > Depends on (a) where (b) what kind of accuracy is needed, forest in many > regions > > > > are unmapped or partially mapped. > > > > > > > > How can I find those places with OSM data ? > > > > > > What you exactly want to find? > > > A forest is a place where you can walk, ride, cycle. Not someones > private backyard. > Our government talks often about there is so many square meter of > forest in Belgium. > It's not sufficient to subtract all small areas, you need to subtract > somehow everything that is not a forest (see above) > > > > > > > > > I thought I had an answer for all the above questions when > > natural=wood, landuse=forest, landcover=trees where used "properly". > > > > > > No, you cant. As there are conflicting tagging methods > > If everything was "properly" mapped with those 3 tags I could come up > with an algorithm. Not with the current mess of course. > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > -- Vr gr Peter Elderson
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