Platonides wrote:
Plan the contest to start by the time next dump is finished. Then run the contest until next dump. You don't even need the old dump to decide which geotags were added. But wikipedians will like a more-or-less up to date list of articles without geotags :)
OK, let's go into detail on the maps.
The problem with adding geo coordinates now is that you're doing it in the blind. To verify that a coordinate is correct, you need to go to the right article, click on the coordinate, and then pick the map provider and see if the pin lands in the right place.
My very first look at WikiMiniAtlas, starting at the small town Grängesberg in central Sweden, revealed that (a) Grängesberg was not shown on that map, because the WikiMiniAtlas database is not up-to-date, and (b) next to it was shown a Norwegian town, which should be 6 degrees west but just happened to have the wrong coordinate -- in the Dutch Wikipedia. I would never have found and corrected that error without WikiMiniAtlas. And you can immediately see if the next town is missing from the map, and go to that article and add the coordinate. This sort of application is extremely useful. That's why I need it to work.
http://sv.wikipedia.org/wiki/Gr%C3%A4ngesberg
http://nl.wikipedia.org/w/index.php?title=Rollag&diff=15400179
Now, I fixed that coordinate in the Dutch Wikipedia a month ago, but the WikiMiniAtlas still shows Rollag next to where Grängesberg should be. That's not useful.
Stefan Kühn wrote that he digs out coordinates from database dumps. I know a lot about digging things out of database dumps and I doubt this is the best way for WikiMiniAtlas, since there are so many different ways that the coord template can be called. Just consider all the lat/lat_min parameters to infobox templates. Shouldn't you just dig out from the external links table, all the links to the stable.toolserver.org/geohack/ and parse the coordinates from those URLs?
And when WikiMiniAtlas is invoked from an article, such as Grängesberg, the call to the toolserver (that fetches the map tiles) could perhaps be used for updating the coordinate for that article. We can be pretty sure that those who update a coordinate will pop up the WikiMiniAtlas to see they made no mistake.