• https://github.com/googlemaps
• https://github.com/googlemaps/js-marker-clusterer
• https://github.com/jawj/OverlappingMarkerSpiderfier

Apis keys

https://developers.google.com/maps/documentation/javascript/get-api-key

https://developers.google.com/maps/documentation/geocoding/start

• The Google Maps Geocoding API will only work with a Server key. APIs of the same platform can use the same key. (https://developers.google.com/maps/documentation/geocoding/get-api-key#types-of-api-keys)

define('GOOGLE_GEO_CODING_API_KEY','');

or (signing request)

• https://developers.google.com/maps/documentation/geocoding/get-api-key#client-id

define('GOOGLE_GEO_CODING_CLIENT_ID',''); define('GOOGLE_GEO_CODING_PRIVATE_KEY','');

• https://developers.google.com/maps/documentation/javascript/tutorial

define('GOOGLE_MAP_KEY','');