On 13/06/18 16:03, Peter Elderson wrote:
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
<mailto:marc.ge...@gmail.com>>:
On Tue, Jun 12, 2018 at 10:57 PM Mateusz Konieczny
<matkoni...@tutanota.com <mailto:matkoni...@tutanota.com>> wrote:
>
>
>
>
> 12. Jun 2018 13:22 by marc.ge...@gmail.com
<mailto: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
<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.
Exclude area with landuse=residential ??
>
> 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".
And you might consider landuse=logging too ...
>
>
> 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.
Proper? Who says what is proper?
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