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To successfully confront a disaster, it is necessary the coordinated and collaborative participation of multiple agencies related to public safety, which provide a response consistent with the requirements of emergency environment and all those affected. For this, is necessary the permanent information exchange between the involved agencies that allows to joint its efforts and to face the emergency of the best possible way. This article describes the interoperability platform architecture, which enables agencies involved in management of an emergency, exchange information using their own information systems and computer tools. The architecture core is inside its Shared Information Space, which manages it as a single storage entity, all information coming from the information systems integrated to the platform. It is founded on a non-relational distributed database and a P2P communications network, to share out the workload between all the platform nodes in order to award availability and scalability to the architecture.

Currently, one of the main challenges that the world's big cities are facing is the security problem of their citizens and specifically the disappearance of people (even more in Latin America countries). Thus, to address this problem, a software system called SiGPro has been developed, which allows notifications for the early location of missing persons, using some technological tools, being one of the most prominent application of the MQTT protocol frequently used in the Internet of Things (IoT). SiGPro applies a MQTT-Bridge for hierarchical server communication and developing the software system for real-time performance. SiGPro innovates a Progressive Notification Mechanism, not considered in other similar projects and being one of the main contributions of this research; it delivers notifications depending on the disappearance distance in order to not saturate the end user. In addition, SiGPro was deployed in three cities in Ecuador, (being Quito city the MQTT-broker), where more than 140 users participated in each city and in different test scenarios. Time and distances of disappearance solution were obtained, taking into account the total anonymity of the victim. Finally, SigPro has shown that increasing crowdsensing (number of users), reduces the distance at which the missing person has been located.

To effectively manage a crisis, is necessary the participation of multiple agencies related to protection and public safety, which allow actions in accordance with the demands of environment and requirements of all those affected. Interoperability is the key to comprehensive and comprehensive Crisis Management (CM), that allow to face any type of disaster, at any time or place. For this, it is necessary the permanent exchange of information that enables all the agencies involved, coordinate its operations and collaborate to manage the situation in the best way possible. This article describes the approach to interoperability in CM carried out by Secure European Common Information Space for the Interoperability of First Responders and Police (SECTOR) European Project, which has one of its main objectives, the development of an interoperability platform that allows the agencies involved in the management of a crisis, to achieve a joint, coordinated and collaborative response. The platform has a core, a Common Information Space (CIS), which manage as a single storage entity, all information of the Information Systems (ISs) connected to the platform, regardless of the model of data and computer applications used by each one of them.

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