Multiscale analysis of cell broadcast and location-based SMS efficiency for public alert in France
In 2022, France will have a new alert system using tools based on the location of individuals in real time: cell broadcast and location-based SMS. These tools will allow alert messages to be sent to all mobile phones located within a danger zone. Many studies have demonstrated the technical effectiveness of these new warning solutions. However, these tools do not escape the traditional constraints and uncertainties of warning tools: (1) not all individuals can be alerted, (2) individuals who are not concerned may be alerted; (3) technical constraints may limit the use of these solutions. This study aims at estimating these three levels of uncertainty at different scales in France (the municipality scale, the intercommunal scale and the department scale) in two-time steps (one locating individuals at their place of residence, the other locating individuals at their place of work). The analysis is carried out on six pilot departments, using GIS and multi-scale analysis method. The results show that the constraints related to the use of cell broadcast are more important at local scales but that important variability of constraints exist according to the levels of analysis, the temporality of the alert and the territories. The use of LB-SMS is more constrained at large scales, as this solution is subject to a risk of network congestion. These results illustrate the importance of considering spatial and temporal scales in the implementation of these two solutions and suggest the drafting of an alert strategy considering the nature of the target territories.
Mots clés : Location-based alerting systems|Multi-scale analysis|Alert|Territories
A103216EB