[Tagging] dry swamps
Jez Nicholson
jez.nicholson at gmail.com
Sat Feb 11 11:03:42 UTC 2023
The UK has plenty of areas around the coast that are deliberately not
protected by flood defences so they would soak up the power of an
intermittent flood. Are these a similar thing? They aren't wetlands as they
aren't wet all the time.
On Sat, 11 Feb 2023, 10:52 Warin, <61sundowner at gmail.com> wrote:
>
> 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, <61sundowner at 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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>
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