On 11/2/23 21:23, Jez Nicholson wrote:
I see what you are saying, but 'dry swamp' feels slightly odd. Is
there something like 'intermittent wetland' that is more appropriate?
It is 'slightly odd' ... in that it is not found in populated parts of
the globe.
OSM tagging is written mostly by people in populated parts of the globe,
so it suits those populated places. That is no ones fault, we all
operate on the knowledge we have.
Unfortunately 'dry swamps' exist and do not fit the definitions used in
OSM exiting tags, 'wetlands' are wet.. not 'dry', 'swamps' are 'wet',
even 'mud' is wet..
OSM existing tags
wetland = "A natural area subject to inundation or with waterlogged ground"
Not water logged most of the time so does not fit... The 'inundation' is
very seldom.
swamp = "An area of waterlogged forest, with dense vegetation."
Not water logged most of the time, not a forest, and not dense vegetation
mud = "Area covered with mud: water saturated fine grained soil without
significant plant growth"
Again not water saturated most of the time.
On Sat, 11 Feb 2023, 10:11 Warin, <61sundow...@gmail.com> wrote:
The ‘dry swamp’ has no apparent way to tag it. These will not be
found in Europe, just as you don’t find deserts there.
They have occasional water, not seasonal, not yearly but, say,
between 5 to 20 years they have water. As such they do not satisfy
the OSM swamp definitions at all.
See
https://theconversation.com/why-a-wetland-might-not-be-wet-103687
for more on their characteristics, at least in Australia. OSM has
access to a imagery source in Australia that maps them, so OSM has
a legal source for them. What is needed is a tag for them, say,
‘natural=dry_swamp’???
There are ~ 4,000 of these ‘natural=mud’ mapped so far that are in
fact ‘dry swamps’. Note that the tag natural=mud wiki says “This
tag should not be used for areas with intermittent water cover
which are water covered or completely dry most of the time.” So
this tagging is incorrect as they are dry most of the time…
There are more in existence but not mapped.
Sample https://www.openstreetmap.org/way/
<https://www.openstreetmap.org/way/1143825454>1143851993
<https://www.openstreetmap.org/way/1143851993>
Any thoughts?
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