FHIR "near" search

[reshmakh]

Have had several geolocation search requests from customers as they build out their applications

See FHIR "Location" resource "near" search parameter:
https://hl7.org/fhir/location.html#search

See FHIR "special" parameters:
https://hl7.org/fhir/search.html#special

Health Gorilla added the "near" to other resource types such as "Practitioner":
https://developer.healthgorilla.com/reference/search-7

AWS Aurora Postgres supports the built in PostGIS extension:
https://aws.amazon.com/about-aws/whats-new/2021/10/amazon-aurora-postgresql-supports-postgis/

That supports "spatial indexes" and "find nearest point" queries:
https://gis.stackexchange.com/questions/136403/postgis-nearest-points-with-st-distance-knn

We would need a geocoding API to go from "address" to "lat long".

Google Maps is the dominant player:
https://developers.google.com/maps/documentation/geocoding/overview
https://developers.google.com/maps/documentation/geocoding/usage-and-billing