Abstract
Building and updating a situational picture of the scenario under consideration is the goal of the Situation Assessment (SA) Information Fusion (IF) process. The scenario generally involves multiple entities and actors where possibly only a few under direct control of the decision maker. SA aims at explaining the observed events (mainly) by establishing the entities and actors involved, inferring their goals, understanding the relations existing (whether permanently or temporarily) between them, the surrounding environment, and past and present events. It is therefore apparent how the SA process inherently hinges on understanding and reasoning about relations. SA is a necessary preparatory step to the following phase of Impact Assessment (IA) where the decision maker is interested in estimating the evolution of the situation and the possible outcomes, dangers and threats. SA and IA processes are particularly complex and critical for large-scale scenarios with nearly chaotic dynamics such as those affected by natural or man-made disasters. This chapter will discuss recent developments in information fusion methods for representing and reasoning about relational information and knowledge for event detection in the context of crisis management. In particular, network methods will be analysed as a means for representing and reasoning about relational knowledge with the purpose of detecting complex events or discovering the causes of observed evidence.
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Notes
- 1.
Although, this typically depends on the specific process and variables under consideration. For example, target tracking (filtering) can be performed in fine-grained time intervals since sensor observations can be frequent enough so to have a “continuous-like” response of the output. For higher level fusion processes, observations are typically much more coarse grained.
- 2.
Command, Control, Communications, Computers, Intelligence, Surveillance and Reconnaissance.
- 3.
One of the interests of the planning algorithms community is providing the most effective (in some sense) sequence of actions that would satisfy the user’s goals. This is particularly relevant for software agents or robotic systems where the software can perform actions that can modify the environment (software environment or the real word as in the case of robots). Here, the SA fusion system is mostly intended at situation monitoring and assessment, with limited direct capacity of modifying the real word (e.g. relocating information sources).
- 4.
This is typical in surveillance and crisis management where the system is processing events as they occur. However, detection of patterns could be performed even over past events, that is mining offline data in search for relevant patterns in a forensic fashion.
- 5.
The relationship just described is assumed to be of causal type where the cause C is known to produce the effect E. C ⇒ E is then a rule expressing a causal relationship between the antecedent and the consequent. This is a typical condition when the KB is built from experts’ knowledge that usually express rules in terms of causation giving to the rules much more strength and semantics than it would happen if the rules were to be learned automatically (in this latter case only correlation can be learned).
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Acknowledgements
This work was partially supported by ONRG Grant N62909-14-1-N061.
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Snidaro, L., Visentini, I. (2016). Network Methods and Plan Recognition for Fusion in Crisis Management. In: Rogova, G., Scott, P. (eds) Fusion Methodologies in Crisis Management. Springer, Cham. https://doi.org/10.1007/978-3-319-22527-2_14
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