Custom symbol key property
OptionalcityCity or locality name
OptionalcountryISO country code (e.g. 'US', 'AU')
OptionalelevationAltitude / Elevation in meters above sea level
OptionallatitudeLatitude coordinate in degrees
OptionallongitudeLongitude coordinate in degrees
OptionalsphereInferred or explicit hemisphere ('north' | 'south' | 'equator')
OptionaltimezoneIANA Time Zone ID (e.g. 'Australia/Sydney')
Custom or future string/number key property