I need to extract objects that fall within the bounds of Senegal - so I
turned to the Overpass API... But it seems that my level of
understanding does not yet match its power. I need your help !
As an exercise, let's find Dakar in Senegal -
http://overpass-turbo.eu/s/1qa :
area[name="Senegal"];
(area
[name="Dakar"]
(area);
<;
);
out;
I do get the city of Dakar, but also a restaurant in Spain and an
apartment building in Seattle... So the area criteria seems inoperative
- this query is equivalent to querying with no area criteria, like
http://overpass-turbo.eu/s/1qb :
area [name="Dakar"];
out;
Maybe selecting the area by name is too sloppy... Let's try selecting it
by id - the relation for Senegal's boundaries is
http://www.openstreetmap.org/browse/relation/192775 and the query should
therefore be http://overpass-turbo.eu/s/1qd :
area[name=Dakar](area:192775);
out;
Same result, but I am not certain that the area criteria can take a
relation id as its argument.
Well... Maybe area selection is inoperative. Let's try with a good old
bounding box - http://overpass-turbo.eu/s/1qe :
(
area
["name"="Dakar"]
(12.167,-17.7862419,16.6919959,-11.3458996)
);
out;
Same result.
What am I doing wrong ? Is the syntax incorrect in every one of my queries ?
As a fallback I could get the country extract and dig into it with xpath
queries - but there is currently no regularly produced Senegal extract
and I'm not yet ready to do that myself...
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