Open Geosocial

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 @schuyler.info

Known Lexicons

• community.lexicon.location
  1. .address - street address
  2. .geo - latitude and longitude
  3. .fsq - foursquare place id
  4. .hthree - h3geo hex identifier
• org.atgeo.place
  1. Referenced from atgeo.org
  2. Not present on lexicon.garden
• community.atprotocol.geomarker.marker
  1. Locations as primary identities
  2. Referenced from Two Ways to Build Location on ATProto: Geo Markers vs. Embedded Check-ins
  3. Not present on lexicon.garden

Known apps

• beaconbits.app - gamified check-ins and placemaking, montoulieu.dev
• Garganorn - ATProtocol XRPC server, @schuyler.info
• Sebastian @seabass.bsky.social, Flashes, https://www.flashes.blue
• Dan @danoleary.me, The Midst, https://www.themidstapp.com
• Matt @librenews.bsky.social, Geo,https://geo.feeds.social
• Tijs @tijs.org, Anchor, https://dropanchor.app
• athere @herebox.org , h3geo proximity filtering

Known community chat

• #atgeo hashtag
• Atproto Touchers Discord
  1. #atgeo-apps
  2. #lcwg-atgeo-gazetteer
• w3c geosocial task force

Gazetteer XRPC Query API

• Gazetteer - XRPC Query API returning ATGeo Place formatted JSON
  1. Example for Stanley Park, Vancouver
     1. OSM way 37063023
        1. places.atgeo.org
        2. openstreetmap.org
     2. Foursquare 598d11080e5da87109b4d0a3
        1. places.atgeo.org
        2. app.foursquare.com
     3. Overture
        1. explore.overturemaps.org
        2. places.atgeo.org ??
           1. similar - 173e824a-dbe3-4354-8950-a15c4f9b9868
           2. 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 :

• 2025-06-08 - The Missing Piece: How Location Data is Coming to the AT Protocol
• 2025-06-09 - Two Ways to Build Location on ATProto: Geo Markers vs. Embedded Check-ins
• 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