|Paper title||Rheticus Safeland: a satellite EO-based service for hydrogeological hazard mapping|
|Form of presentation||Poster|
The ground motion due to landslide or other natural phenomena can cause serious damage to infrastructures and the environment, and it represents a risk for the citizen. Landslides may destroy roads, railways, pipelines, and buildings, even causing victims. In recent years, the continuous growth of the intensity and frequency of extreme natural phenomena has been observed, and there is a clear relationship between both human activities and climate change.
The satellite Earth Observation is proven to be extremely useful in the hazard mapping related to hydrogeological events. Indeed it represents a powerful tool to generate uniform information at global scales and covering a wide span of risk scenarios. It constitutes a unique source of information that can help monitor and link hazards, exposure, vulnerability modifiers, and risk.
Planetek Italia has been involved in different projects related to the exploitation of EO-derived information to support the hydrogeological hazard mapping, due to natural disasters like landslides, subsidence, earthquake and tsunami. One of these projects is the Disaster Risk Reduction (DRR), an ESA project within the Earth Observation for Sustainable Development (EO4SD) program.
Among the activities of the project, Planetek Italia delivered ground motion maps based on the Rheticus Displacement service, that implements the PSI technique allowing the exploitation of the result in a user-friendly environment through a web interface. The platform has several tools for better highlighting the persistent scatterers affected by motion.
Due the complexity of the hazard phenomena and of the transformation of the ground motion information into risk mitigation operations by the end-users, in Planetek – thanks to the interactions with different end users – it has grown the idea that the users needed a more simplified tool; a tool able to support the hazard mapping over areas of the territory, and not only punctual information provided by the persistent scatterers.
To this aim, Planetek Italia developed Rheticus® Safeland, a vertical geoinformation service, to answer the needs of the local authorities in charge of the geohazards managements. The service uses advanced technological solutions for monitoring and predicting ground motion phenomena through the integration of the satellite ground motion mapping and local data related to the environment and infrastructures.
Rheticus Safeland provides a unique source of actionable information that can help monitor and link hazards, exposure, vulnerability modifiers, and risk. In this way, the service supports the local authorities in charge of risk management both to protect citizens from danger and to prevent increased costs and delays to new developments.
The Rheticus Safeland service, through automated procedures, provides a normalized level of concern (0:1) to each portion of the territory based on the trends of surface displacement estimated through the PSI and further parameters that take into account the orography, the coverage vegetation and the presence of infrastructures and buildings.
The monitored area is divided into hexagonal cells, classified and thematized in 3 classes with 3 different colors corresponding to increasing levels of concern: green, yellow, and red (Figure 1)
In addition to the estimated priority level for each cell, the Rheticus® Safeland service provides a level of concern on all buildings, roads and railways present within the monitored area of interest as shown in the Figure 2.
Rheticus® Safeland is able to automatically identify areas affected by slow landslides, prioritizing them according to the magnitude of the motion together with the ancillary parameters connected with the phenomena like slopes, landcover, flooding risk…
Planetek proposed the utilization of the Rheticus® Safeland within the ESA-GDA DRR project, in order to provide detailed levels of information for automatic hazard mapping to engineers, planners, and other users. The complete picture provided by the Rheticus Safeland service will provide planners with the vital knowledge they need to prioritize the implementation of risk mitigation measures, to make better decisions, and proactively avoid critical issues that arise when in-progress phenomena are not fully understood.