Hi Brad,
ahhh - that makes sense! Many thanks for the tips, that's great!
Bjoern
On 2 May 2017 at 15:19, Brad Jorsch (Anomie) <bjorsch(a)wikimedia.org> wrote:
On Mon, May 1, 2017 at 7:14 PM, Bjoern Hassler
<bjohas+mw(a)gmail.com>
wrote:
not sure whether this is an API issue, or
something to do with the way
coordinates are stored.
Neither.
If you look at this query, you'll see that
for some of the pages
coordinates are listed, for others they are not:
https://de.wikipedia.org/w/api.php?action=query&prop=coordin
ates&generator=categorymembers&gcmtitle=Kategorie:Ur-_und_
Fr%C3%BChgeschichte_(Menorca)&gcmlimit=500
<https://de.wikipedia.org/w/api.php?action=query&prop=coordinates&generator=categorymembers&gcmtitle=Kategorie:Ur-_und_Fr%C3%BChgeschichte_%28Menorca%29&gcmlimit=500>
That's because you're leaving colimit at its default of 10 and there are
more than 10 pages with coordinates in the request, so you'll need to use
query continuation to fetch the rest of the data and merge it in. See
https://www.mediawiki.org/wiki/API:Query#Continuing_queries. You might
also specify a larger limit, e.g. colimit=500 or colimit=max, to reduce the
need for continuation.
Another thing to watch for is that there are two types of coordinates,
"primary" and "secondary". By default, only primary coordinates are
returned. If you need secondary coordinates as well, you'll need to specify
coprimary=all
in your request.
--
Brad Jorsch (Anomie)
Senior Software Engineer
Wikimedia Foundation
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