I wonder where they're getting the data. I assumed OSM but I found at least one place on this map that I couldn't find on OSM or in All the Places (but it is on Google Maps).
If anything it seems to err on the side of false positives. A lot of these places seem to be traditional gyms or trampoline parks that I don't think have any bouldering walls.
I wonder as well. Most of the climbing gyms are missing in France's big cities (Arkose, ClimbUp, etc) and the School Room is not even on the map :( !
I used Google map API to fetch all the gyms then cached it locally. It only allows (at least from what I can find) text search within a viewport. I think there are some problems when loading boulder gyms in France. At first glance, I thought France was not really into bouldering...
That first glance was a very wrong glance considering that Fontainebleau is widely considered the bouldering Mecca
> At first glance, I thought France was not really into bouldering...
You'd be very wrong! There is at least 40 bouldering gyms in Paris (and suburbs) alone.
You should consider feeding your data into OSM! Surely there's already a suitable metadata tag for olfactics?