are you using NIP66 for this? it has geo tags.. you can find them on monitorlizard.nostr1.com and relaypag.es
anyone can publish these, with a monitoring tool like 
GitHub
GitHub - relaytools/monitorlizard: Monitoring of relays with output formats for distribution over nostr (nip66) and InfluxDB
Monitoring of relays with output formats for distribution over nostr (nip66) and InfluxDB - relaytools/monitorlizard