Method and system for providing a federated wide area motion imagery collection service

A method implemented by a computer system that includes at least one processor configured to execute computer program instructions for providing a federated wide area motion imagery (WAMI) collection service (CS), the method comprising:

• receiving, by the at least one processor, an alert from at least one WAMI alert-service (A) respectively associated with at least one WAMI CS regarding any updates to WAMI data served by the at least one WAMI CS at the federated WAMI CS, the at least one WAMI CS providing WAMI collection metadata;
• issuing, by the at least one processor, a Hypertext Transfer Protocol (HTTP) or a Hypertext Transfer Protocol Secure (HTTPS) request, in response to the alert, from the federated WAMI CS to the at least one WAMI A associated with the respective at least one WAMI CS to read information on what is updated within the at least one WAMI CS;
• receiving, by the at least one processor, a response, in response to the HTTP or HTTPS request, from the at least one WAMI A at the federated WAMI CS, the response comprising a list of nodes in a tree corresponding to WAMI collection metadata that are updated by the at least one WAMI collection service;
• issuing, by the at least one processor, a subsequent request, in response to the response, to the at least one WAMI CS from the federated WAMI CS to retrieve the WAMI collection metadata from the at least one WAMI CS corresponding to the collection tree nodes that are updated;
• receiving, by the at least one processor, in response to the subsequent request, a subsequent response including the WAMI collection metadata from the at least one WAMI CS;
• and
• storing the received WAMI collection metadata in a local cache of the federated WAMI CS of the computer system.