Add geolocation support to events (NIP-52 'g' tag) #13

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opened 2026-04-27 16:20:07 +00:00 by padreug · 0 comments

padreug commented

2026-04-27 16:20:07 +00:00

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Summary

Allow events to be geotagged with coordinates so they can be discovered on a map. NIP-52 supports the g tag (geohash) for location-based filtering.

Scope

Add geohash field to Event model (optional string)
Add latitude and longitude fields to CreateEvent (optional floats)
Convert lat/lng to geohash on creation (using ngeohash library, already used by the webapp activities module)
Publish as NIP-52 g tag in the NostrEvent
Migration to add geohash column
The existing location field (free-text venue/address) remains separate — geohash is the machine-readable coordinate

NIP-52 spec

The g tag uses geohash encoding for location-based relay queries:

["g", "<geohash>"]

Relays can filter by geohash prefix for geographic proximity searches.

aiolabs/webapp#30 — webapp UI for geotagging events (map picker + map-based discovery)
The activities module already uses ngeohash for activity geolocation

## Summary Allow events to be geotagged with coordinates so they can be discovered on a map. NIP-52 supports the `g` tag (geohash) for location-based filtering. ## Scope - Add `geohash` field to Event model (optional string) - Add `latitude` and `longitude` fields to CreateEvent (optional floats) - Convert lat/lng to geohash on creation (using `ngeohash` library, already used by the webapp activities module) - Publish as NIP-52 `g` tag in the NostrEvent - Migration to add `geohash` column - The existing `location` field (free-text venue/address) remains separate — geohash is the machine-readable coordinate ## NIP-52 spec The `g` tag uses geohash encoding for location-based relay queries: ```json ["g", "<geohash>"] ``` Relays can filter by geohash prefix for geographic proximity searches. ## Related - aiolabs/webapp#30 — webapp UI for geotagging events (map picker + map-based discovery) - The activities module already uses `ngeohash` for activity geolocation

padreug referenced this issue from aiolabs/webapp

2026-04-27 16:25:51 +00:00

Add geolocation picker to event creation and map-based event discovery #30

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aiolabs/events#13

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