Awesome. I wasn't aware of this wider list of proposals, thx.
Digging in...
NIP-44 Geospatial Types
Discussion
Hey Nathan! Would love to work with you to help refine and improve this concept. Early on it seemed like GeoJSON objects would be a natural fit. Now I’m not so sure that string encoding one spec inside of another is a good idea. You can effectively represent the same data and relationships using the existing nostr tags [e,p,t,g]
As you’ll see in the comments, the g tag just kinda showed up one day unannounced. I think it’s great, but see no reason why it should be limited to a geohash. Starting to lean towards the idea of putting WKB in there and using content and #t for everything else.