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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