The Common Alerting Protocol (CAP) is an XML-based data format for exchanging public warnings and emergencies between alerting technologies. CAP allows a warning message to be consistently disseminated simultaneously over many warning systems to many applications, such as Google Public Alerts and Cell Broadcast. CAP increases warning effectiveness and simplifies the task of activating a warning for responsible officials.
Standardized alerts can be received from many sources and configure their applications to process and respond to the alerts as desired. Alerts from the Department of Homeland Security, the Department of the Interior's United States Geological Survey, and the United States Department of Commerce's National Oceanic and Atmospheric Administration (NOAA), and state and local government agencies can all be received in the same format by the same application. That application can, for example, sound different alarms, based on the information received.
By normalizing alert data across threats, jurisdictions, and warning systems, CAP also can be used to detect trends and patterns in warning activity, such as trends that might indicate an undetected hazard or hostile act. From a procedural perspective, CAP reinforces a research-based template for effective warning message content and structure.
The CAP data structure is backward-compatible with existing alert formats including the Specific Area Message Encoding (SAME) used in NOAA Weather Radio and the broadcast Emergency Alert System as well as new technology such as the Wireless Emergency Alerts (WEA), while adding capabilities such as the following:
Flexible geographic targeting by using latitude/longitude “boxes” and other geospatial representations in three dimensions
Multilingual and multi-audience messaging
Phased and delayed effective times and expirations
Enhanced message update and cancellation features
Template support for framing complete and effective warning messages
Digital encryption and signature capability
Facility for digital images, audio, and video.
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