Abstract
Abstract. Monitoring the spatial footprint of cyclone impacts by remote sensing offers great potential for assessing the extent of damage and monitoring the resilience of the affected territories. For this purpose, as part of the Renovrisk-Impact project, we have developed two change detection processing chains based on optical (Sentinel-2) and SAR (Sentinel-1) data. These chains have been used to track different events in different regions of the world. In this article we focus on two study sites in Madagascar: the city of Miandrivazo, which was heavily affected by severe rainfall from Cyclone AVA in January 2018, and more recently the town of Marovoay which suffered a major disaster following the passage of tropical storm DIANE in January 2020. The obtained results were evaluated and compared with the Copernicus Emergency Mapping Service product, showing good consistency with this product and between them. These results confirm the potential of these Sentinel data and the developed processing chains for monitoring the impacts of cyclones, but also open up prospects for longer-term monitoring.
Highlights
With an average of nine cyclones per year during the last six decades, countries bordering the South West Indian Ocean (SWIO) are exposed to this risk
Even if no significant changes in frequency could be highlighted in this region during this period, future impacts for populations could increase as there is a large global consensus on cyclone intensity predictions (maximum intensity reached for a cyclone, number of cyclones reaching high intensities, frequency of landfalls for high intensity cyclones (Kuleshov et al 2010))
We developed two complementary automated processing chains respectively based on Sentinel-1 (S1) and Sentinel-2 (S2) time series in the frame of the INTERREG Renovrisk- Impact project dedicated to the continuous monitoring of hurricane impacts in the SWIO, and the assessment of the associated economic consequences
Summary
With an average of nine cyclones per year during the last six decades, countries bordering the South West Indian Ocean (SWIO) are exposed to this risk. Climate change will induce even more intense hurricanes and new affected areas. Should these severe weather phenomena be better understood, but there is a necessity to improve the assessment of their impacts. Climate change is modifying multiple types of climate-related hazards in terms of occurrence, intensity and periodicity. It increases the likelihood of compound hazards that comprise simultaneously or sequentially occurring events to cause extreme impacts in natural and human systems (Collins et al, 2020). This calls for reflection on the conditions for observing the impacts of extreme events
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
