[OSM-talk] Forests are mappable - was: Re: OTG rule, borders & mountains existing | Re: Crimea situation - on the ground

[Warin]

The problem?

Large areas of blank map that, when viewed zoomed out, look to be tree 
covered areas.

Result:

Initial mappers tag the large areas as tree covered, ignoring details 
such as lakes, tree cuttings etc.

Some time later details of lakes, tree cuts are added. this may be some 
years later.

This is simple evolution of the map - more detail as time goes by. there 
is no bad intention with any of the mappers, just trying to give some 
impression of what is there.

Problems arise when the source used it not good enough to really say 
what is there, a swamp may look like a patch of grass, or heath ... if 
you simply go by imagery then I think this is bad practice.


On 13/2/20 8:13 am, Pierre Béland via talk wrote:
> Hi Mateusz
>
> The link below shows north of Canada areas, where the wood landcover 
> correspond in general to Canvec imports. The blank areas are mostly 
> not mapped yet except some lakes and infrastructures.
> https://www.openstreetmap.org/#map=5/55.740/-79.804
>
> But for Labrador, the contributors have made the choice to import 
> Canvec excluding the wood landcover. If someone wants to test how easy 
> it is to add the wood landcover, there is quite some work to do there 
> creating multipolygons with inner roles for lakes, cuts for Power 
> lines, etc.
> https://www.openstreetmap.org/#map=9/53.4595/-63.9679
>
> Pierre
>
>
> Feb 12 r 2020 13 h 30 min 57 s UTC−5, Mateusz Konieczny wrote :
>
>
> Hard to say more or verify without getting specific location but I 
> cleaned up some places
> mangled by badly done forest imports - for example border area that 
> was hit with multiple
> low quality imports.
>
> But it sounds exactly like 
> https://www.openstreetmap.org/user/Abbe98/diary/28368
> that was solved by splitting unreasonably large relation in parts (by 
> deleting it
> and remapping)
>
>
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