Sentinel-1 Change Detection Analysis for Cyclone Damage Assessment in Urban Environments

被引:17
|
作者
Malmgren-Hansen, David [1 ]
Sohnesen, Thomas [2 ]
Fisker, Peter [3 ]
Baez, Javier [2 ]
机构
[1] Tech Univ Denmark, Dept Appl Math & Comp Sci, DK-2800 Lyngby, Denmark
[2] World Bank, 1818 H St NW, Washington, DC 20433 USA
[3] Univ Copenhagen, Dept Econ, Dev Econ Res Grp, DK-1353 Copenhagen, Denmark
关键词
Synthetic Aperture Radar; change detection; disaster monitoring; damage assessment; cyclones; Sentinel-1; SAR;
D O I
10.3390/rs12152409
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页数:16
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