If you have the location name and address for a POI, use lookup: location_name & address to retrieve the geospatial coordinates for that place.

query {
  lookup(
    query: {
      location_name: "Pier 39"
      street_address: "39 Pier 39"
      city: "San Francisco"
      region: "CA"
      iso_country_code: "US"
    }
  ) {
    placekey
    safegraph_core {
      location_name
      street_address
      city
      region
      iso_country_code
      postal_code
      latitude
      longitude
    }
  }
}

{
  "data": {
    "lookup": {
      "placekey": "zzy-22b@5vg-7f8-bc5",
      "safegraph_core": {
        "location_name": "Pier 39",
        "street_address": "39 Pier 39",
        "city": "San Francisco",
        "region": "CA",
        "iso_country_code": "US",
        "postal_code": "94133",
        "latitude": 37.808961,
        "longitude": -122.409856
      }
    }
  },
  "extensions": {
    "row_count": 1,
    "version_date": "1635494405__2021_10"
  }
}