I'm not against natural=badlands for areas that are covered by a non
vegetated surface in an erosive context with steep slopes (as per
https://en.wikipedia.org/wiki/Badlands). Anyway they seem to be a more
specific case than a "simple" bare soil.
I think that, in general, when dealing with land cover things in
OpenStreetMap, we should really try and use some knowledge from standard
definitions, e.g. Corine Land Cover CLC). I see that there is already a
page defining connections between OSM elements and CLC classes [1]
In the case of /badlands/, they are mentioned as one of the examples in
/3.3.3. Sparsely vegetated areas/ [2].
I'm quite new in discussions about land cover in OSM, but wouldn't it be
useful to add, in addition to OSM-specific tags like natural=bare_rock,
natural=shingle, natural=scree, ... a tag to reference standard land
cover classification?
I see that a tag /CLC:code /[3] already exists and used more than 300000
times, but it seems to be used only in case of imports and it is
suggested (with a very weak motivation, IMHO) to be deleted after
editing those areas after import.
In the example of badlands, would it be useful to have both
/natural=badlands /(or any other agreed OSM-spefici tag) + /CLC:code=333
and//or /land_cover=sparsely_vegetated_areas /?
I see many useful uses coming from this.. but I could be wrong...
Any ideas?
Ale
[1] https://wiki.openstreetmap.org/wiki/Corine_Land_Cover
[2]
https://land.copernicus.eu/user-corner/technical-library/corine-land-cover-nomenclature-guidelines/html/index-clc-333.html
[3] https://wiki.openstreetmap.org/wiki/Key:CLC:code
On 20/10/19 07:31, Joseph Eisenberg wrote:
Perhaps the term “badlands” is only used in a North America. Wikipedia
has a description:
"Badlands are a type of dry terrain where softer sedimentary rocks and
clay-rich soils have been extensively eroded by wind and water. ...
They are characterized by steep slopes, minimal vegetation" and thin
soil - but not exposed bedrock, usually.
Photo examples:
1) Chinle Badlands, Utah: https://en.wikipedia.org/wiki/File:Chinle_Badlands.jpg
2) Badlands near Coober Pedy in central Australia:
https://www.alamy.com/the-badlands-area-near-coober-pedy-in-central-australia-image67285952.html
3) Drum Badlands, Alberta: https://en.wikipedia.org/wiki/File:Drumbadlands.jpg
4) Las Médulas, Spain:
https://en.wikipedia.org/wiki/File:Panorámica_de_Las_Médulas.jpg
5) Valle de la Luna, Argentina:
https://en.wikipedia.org/wiki/File:P1010357_1.JPG
6) Badlands National Park, South Dakota:
https://en.wikipedia.org/wiki/File:Badlands00503.JPG
- Joseph
On Sun, Oct 20, 2019 at 11:14 AM Warin <[email protected]> wrote:
On 20/10/19 11:19, Joseph Eisenberg wrote:
How should areas of bare soil, such as badlands, be tagged?
Currently there are documented tags for dry areas of bedrock, stones and sand:
natural=bare_rock, natural=shingle, natural=scree, and natural=sand
For tidal areas, beaches and wetlands there's also natural=beach,
natural=shoal and wetland=mud
However, there's no documented, common tag for dry areas of exposed
clay, silt or mixed soil.
natural=badlands has been used 5 times, but this is rather specific
and may not be well-known outside of North America:
https://taginfo.openstreetmap.org/tags/natural=badlands
natural=desert is common, but includes all kinds of vegetated and
unvegetated arid areas; many of these can be tagged with natural=
grassland, heath, scrub, sand, scree etc.
Desert is a climate, not a land cover nor a land form. Some deserts include
'lakes'.
The key natural has climate, land form and land cover all in the one tagging
scheme, I don't think is is a good scheme and would be better separated into
the individual things it is trying to tag.
natural=clay has been used twice:
https://taginfo.openstreetmap.org/tags/natural=clay
natural=earth has been used 20 times:
https://taginfo.openstreetmap.org/tags/natural=earth
natural=bare_earth has 23 uses:
https://taginfo.openstreetmap.org/tags/natural=bare_earth
There's also natural=pebbles with 67 uses
(https://taginfo.openstreetmap.org/tags/natural=pebbles)
and natural=gravel 90 times -
https://taginfo.openstreetmap.org/tags/natural=gravel
But most of those could be scree or shingle, which would be more specific.
Would it be best to describe the type of soil, like natural=clay,
=silt, =earth, =pebbles, =gravel?
Better to tag specific things rather than a group.
Should mappers use surface=* without another top-level tag?
No.
Should natural=bare_earth be used in general for clay and other bare soils?
Or is natural=badlands best to describe the specific feature of an
arid area where the bare soil is exposed due to erosion?
I have no idea of what 'badlands' are .. from your information it is not single
land cover nor a land form.
So it is a climate? A climate that causes erosion to a bare surface? No
vegetation?
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