Assessing Flood Susceptibility from Satellite Imagery: The Pleiades4UrbanFlood Project Labeled by the Space Climate Observatory (SCO)

The goal of the Pléiades4UrbanFlood project is to develop a prototype for a priori assessment of the vulnerability of urban environments to flooding. This tool will use satellite images provided by the Pleiades and Pleiades Neo very high spatial resolution satellites to assess urban morphology at a finer scale. Two important challenges of the project are to determine the urban morphology from a single satellite view and to automate the calculation of important parameters for flood modeling.

Local authorities want to have accessible equipment Improving flood risk awareness and develop their regions in resilient ways to address these risks. The stakes are greater in all regions Highly urbanized, where the effects of flooding can be substantial. The Pleiades4UrbanFlood project was labeled 2022 by the Space Climate Observatory (SCO) France, as well as the EO4 Wetlands project managed by Cerema.

Towards a risk assessment tool for communities

Pléiades images taken before and after flooding from Storm Alex

Objective of the project Pleiades4UrbanFlood Selected within the framework of the 3rd call of the Space Climate Observatory for the project, the first to be produced Information on terrain morphology and topography (both natural and man-made objects) from monoscopic satellite imagery (angle of view), then to provide a A tool for assessing the susceptibility of areas to flooding WHO automatically Chains of data production as well as indicators while allowing the intervention of operators to act on certain parameters.

Led by Cerema in partnership with the companies Airbus Defense & Space, TerraNIS and Agenium 3D Lab, the Pléiades4UrbanFlood project incorporates the results of previous work carried out by these partners. This work will be based on learning method Deep learning from very high spatial resolution images Identify buildings and plants Analyzes shading as well as image texture. Indicators will be developed, such as footprint characteristics, spacing of buildings and vegetation, soil sealing levels, etc.

These indicators will make feeding possible Hydraulic modelBut to define Urban morpho- typeswhich will ultimately enable the creation of indicators of areas at high risk of flooding linked to urban networks
At the end of the work, a tool will be proposed for urban planners and developers, to understand and consider the connections between urban morphology and flood susceptibility. It will include input data, indicators for running simulations, and cartographic web interfaces for consulting the information.

This tool will make it possible to monitor over timeThe evolution of sensibilities in the urban fabric Based on the available monoscopic Pléiades image archive in the same area.

A demonstrator with the Metropole of Montpellier

A protester’s territory will be enforced Metropolis of Montpellier Which is highly susceptible to urbanization and flooding, a Visualization platform developed by TerraNIS. A data processing chain will be implemented for the metropolis, and then transferred to other cities to ensure this Replicability.

There will be community intervention Need to understand better As part of its strategy to reduce flood risk. It will also provide Information and one Business skills It is necessary to finalize the tool, which is designed to be usable in all regions.

In addition to project management, Cerema will contribute its expertise to its developmentImage processing tool and generationUrban index (Satellite Hub, Occitany Territorial Division) and in perspective Hydraulic modeling in connection with development (Hydraulics for Planning and Mediterranean Territorial Direction Research Team). All data and methods produced specifically for this project by Cerema will be shared and made available in open source.

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