On 17-9-2010 16:28, Dave F. wrote:
http://en.wikipedia.org/wiki/Seawall
There appears to be only 7 occurrences of sea wall so I'm wondering if a
different tag is being used, or maybe no-one's mapped them yet.
Has anybody mapped this type of barrier before?
During our import in The Netherlands[1], we're using
man_made=reinforced_slope. This is a kind of placeholder tag until a
more specific (or otherwise better) tag is found to be more common
place, or until a local survey classifies what type of reinforced slope
it is and sets better tags. Better tags don't seem to be in widespread
use, though, or at all.
Reinforced slope was chosen as a direct translation of the dutch
classification in the dataset being imported. Some of these are actually
seawalls, some are the outer side of a dike/levee lining rivers. Can't
use man_made=dyke in the latter case, as that describes the entire dyke,
i.e. two slopes and the top bit.
The idea for this placeholder tag was that a local survey would mean the
object got retagged, and we could recognize by the occurence of
man_made=reinforced_slope that a survey would still be required.
The ones that are actually groynes we have already reclassified as
man_made=groyne during the import, as they're so easy to spot. Same goes
for man_made=breakwater.[2]
Obviously, if man_made=reinforced_slope (and a possible subclassing)
would somehow be adopted as the tag to use world wide, we'd be done. :)
[1] http://wiki.openstreetmap.org/wiki/3dShapes
[2] Tagwatch counts for NL at this moment: groyne (2596), breakwater
(42), reinforced_slope (564).
--
Lennard
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