On 24/11/2011 15:33, Alexandros Papadopoulos wrote:
Hello.
I am mapping the islands of the Salar de Uyuni
(http://osm.org/go/NK_7Jv--) as I found it particularly annoying they
were not on the map when I needed this information.
The one island that *was* already mapped
(http://www.openstreetmap.org/browse/way/43540410) was tagged with
natural=land which seems to be deprecated.
For this case (a salt flat), I have been using natural=coastline and
place=island/islet. Is this OK?
No - islands within the sea should be tagged with natural=coastline, but
not islands within inland water, eg lakes/ponds/rivers.
That Salar de Uyuni is tagged as natural=water, so it counts as inland
water, and is equivalent to a lake or pond.
Islands in inland water need to mapped with multipolygon relations. ie
map the island as an area, and add it to a multipolygon relation with
role "inner", and add the outline of the lake to the relation with role
"outer".
I see that Isla Incahuasi is already mapped with a multipolygon
relation, so you can add all of the other islands to the same relation,
with role inner for each.
There is no need to tag the islands with natural=land. It is more useful
to tag what is actually there. eg if the island is covered with trees
then tag it with natural=wood, or if its a beach tag it as natural=beach
etc.
And is it still true that it may take months for the changes in
coastline to render on the map and thus the newly mapped islands to
appear?
Yes, coastline can take months to update on Mapnik. But this does not
apply to inland water - it should update more or less immediately.
Craig
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