Sentinel-1 change detection analysis for cyclone damage assessment in urban environments

David Malmgren-Hansen*, Thomas Sohnesen, Peter Fisker, Javier Baez

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

For disaster emergency response, timely information is critical and satellite data is a potential source for such information. High-resolution optical satellite images are often the most informative, but these are only available on cloud-free days. For some extreme weather disasters, like cyclones, access to cloud-free images is unlikely for days both before and after the main impact. In this situation, Synthetic Aperture Radar (SAR) data is a unique first source of information, as it works irrespective of weather and sunlight conditions. This paper shows, in the context of the cyclone Idai that hit Mozambique in March 2019, that Change Detection between pairs of SAR data is a perfect match with weather data, and therefore captures impact from the severe cyclone. For emergency operations, the filtering of Change Detections by external data on the location of houses prior to an event allows assessment of the impact on houses as opposed to impact on the surrounding natural environment. The free availability of SAR data from Sentinel-1, with further automated processing of it, means that this analysis is a cost-effective and quick potential first indication of cyclone destruction.

Original languageEnglish
Article number2409
JournalRemote Sensing
Volume12
Issue number15
ISSN2072-4292
DOIs
Publication statusPublished - Aug 2020

Keywords

  • Change detection
  • Cyclones
  • Damage assessment
  • Disaster monitoring
  • Sentinel-1
  • Synthetic Aperture Radar

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