Radar satellites can better protect against bushfires and floods


New research led by Curtin University has revealed how radar satellites can improve the ability to detect, monitor, prepare for and withstand natural disasters in Australia including bushfires, floods, and earthquakes.

The research used Synthetic Aperture Radar data obtained by the European Space Agency Sentinel-1 satellite, amongst others, to evaluate Australia-specific case studies.

Lead researcher Dr. Amy Parker, an ARC Research Fellow from Curtin's School of Earth and Planetary Sciences, said the Sentinel-1 satellite mission provided the first complete global Synthetic Aperture Radar (SAR) dataset and the first opportunity to use this type of data to assess hazards in new locations, including Australia. What makes SAR so valuable is that it provides the all-weather and night-and-day capability to remotely monitor the Earth's surface, unlike traditional optical Earth Observation (EO) imagery which is at the mercy of cloud, fog, rainfall, and smoke. SAR data can be used to precisely map topography, track movements of the ground surface, characterize land-use change, and map damage to infrastructure, all of which can significantly improve how we track and respond to natural disasters. But despite SAR satellites being well-documented as a hazard monitoring tool, the uptake of such data varies, and in Australia, the use of SAR data has been limited.

The research applied SAR data to nine case studies covering critical issues such as bushfires, floods, and earthquakes to assess the power of SAR as a disaster mitigation and prevention tool. For example, we looked at the 2016 Wildman Coastal Plains Floods in the Northern Territory and found that SAR has added benefits in mapping flood patterns and floodplain dynamics.

Dr. Parker said these benefits can also be applied to maintaining mine site safety and better understanding seismic hazards and activity. Globally, Australia is one of the largest users of Earth observation data derived from satellites, which contributes to national hazard monitoring and response and more than 100 state and federal government programs. Our research shows SAR data can effectively complement this. Previously SAR data has been considered too expensive to use as a tool for hazard mitigation, but our findings show, through Sentinel-1 we now have economically viable wall-to-wall, consistent sensor imaging of Australia. The uptake of SAR data for hazard applications globally will continue to benefit from validated case studies such as ours, the development of tools that support operational use, and the continued provision of open-access imagery by large-scale satellite missions.

The research paper is titled Applications of Satellite Radar Imagery for Hazard Monitoring: Insights from Australia was published in Remote Sensing.

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