Would it be possible to extend geohash to define a polygon in a compact manner? e.g. ['9bc1db2', '9bc1db6', '9bc1db1', '9bc1db0', '9bc1db4', '9bc1db9', '9bc1db8', '9bc1dbd', '9bc1db3'] has lots of repetition. Might be nice to have a geopolyhash or something that can compress this...

e.g. maybe have a cbor structure that encodes this? Then maybe encode as base32 or base64 or whatever. If we can get a spec going then maybe we could also get a CBOR semantic tag if it doesn't exist already.

{ "origin": "9bc1db2", "vertices": [ {"deltaLat": 0.0001, "deltaLon": -0.0002}, {"deltaLat": 0.0003, "deltaLon": -0.0001}, {"deltaLat": -0.0002, "deltaLon": 0.0004}, {"deltaLat": -0.0006, "deltaLon": 0.0003}, {"deltaLat": -0.0003, "deltaLon": -0.0001}, {"deltaLat": -0.0004, "deltaLon": 0.0002}, {"deltaLat": 0.0002, "deltaLon": 0.0001}, {"deltaLat": 0.0004, "deltaLon": -0.0004}, {"deltaLat": -0.0001, "deltaLon": 0.0003} ] }