Notes on geosocial on atproto during atmosphereconf 2026, also known as #atgeo
atgeo.org
2026-03-27 - atgeo.org - ATGeo provides a Place lexicon for ATProtocol, and a lookup service for geographic venues that implements the lexicon. Published by
Known Lexicons
.address - street address
.geo - latitude and longitude
.fsq - foursquare place id
.hthree - h3geo hex identifier
org.atgeo.place
Referenced from atgeo.org
Not present on lexicon.garden
community.atprotocol.geomarker.marker
Locations as primary identities
Not present on lexicon.garden
Known apps
beaconbits.app - gamified check-ins and placemaking,
montoulieu.dev
Garganorn - ATProtocol XRPC server,
Sebastian @seabass.bsky.social, Flashes, https://www.flashes.blue
Dan @danoleary.me, The Midst, https://www.themidstapp.com
Tijs @tijs.org, Anchor, https://dropanchor.app
athere , h3geo proximity filtering
Known community chat
#atgeo hashtag
#atgeo-apps
#lcwg-atgeo-gazetteer
Gazetteer XRPC Query API
Gazetteer - XRPC Query API returning ATGeo Place formatted JSON
Example for Stanley Park, Vancouver
Overture
similar - 173e824a-dbe3-4354-8950-a15c4f9b9868
not found - fa586cc1-cc1a-3a1e-b4b3-9162df5a0e5c
Additional refs
From atprotocol.dev :
2025-03-05 - Location Data on AT Protocol, the second Community Fund project
From tijs.org :
2025-06-13 - Building a Foursquare Clone on AT Protocol
From atproto.wiki :
2025-06-30 ATgeo Marker - Experimental app for markers to test Gazeteers + Geo lexicons. See ATgeo Experiments.
ATgeo working group and ATgeo Experiments
From essentialrandom.bsky.social :
2025-09-29 - atgeo lexicon usage analysis
From herebox.org :
2026-03-12 - W3C - geosocial task force
Example h3geo hex for downtown Vancouver addressable as #8728de8d8ffffff at resolution 7
Example python code to post to PDS as custom collection using community.lexicon.location.hthree , github.com/here/athere