Hi,
A recent post on this list led me to investigate the tag building=hut.
I'm not entirely sure that I remember it's history within HOT, but I
believe many of us started using it on round thatched dwellings at the
start of the Ebola outbreak. I've been creating a circle of the correct
size and tagging the way as 'building=hut' in much the same way as we
create a rectangle / polygon on a square sided structure and tag it
building=yes. The info on the main tagging wiki at
http://wiki.openstreetmap.org/wiki/Key:building shows the tag being used
on an area, not a node.
I've had a quick look on overpassturbo for part of Liberia, and there
are clusters of the tag, in some places on a node & in others on a
polygon - on at least one occasion the node has a comment similar to '7
huts'.
A quick query on taginfo for building=hut;
All 832415,
Node 8113
Way 824247
Relation 55
The purpose of creating the polygon was for the clever GIS folk to
analyse and create population estimates, when used in conjunction with
the landuse=residential polygon which needs to be traced fairly closely
around the perimeter of the cluster of buildings to allow accurate
estimates of population for a village / hamlet / town (Something to do
with area calculations). I suspect that it is still being used for that
purpose, and will continue to do so. Also if the building is traced it
appears on the map, but if it is a node it does not. On the basis you
can do a more accurate calculation on the area from the polygon & you
can't do it on a node that could represent an unknown quantity of
buildings I think we need;
* When remote mapping an area, unless the task description says
otherwise, create a polygon for the round dwelling and tag it building=hut
* To ensure our own training & reference sites, such as wiki pages,
LearnOSM and slide shows or other materials are up to date - if it's
wrong & you can't fix it, at least highlight it so someone can.
--
Nick
Volunteer 'Tallguy' for
https://wiki.openstreetmap.org/wiki/Humanitarian_OSM_Team
http://www.openstreetmap.org/user/Tallguy
Treasurer, website & Bonus Ball admin for
http://www.6thswanleyscouts.org.uk/ ([email protected]
<mailto:[email protected]>)
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