EOS-RS Damage proxy map: Indonesia, Semeru volcano, Dec 2021, v0.8

The Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS) created this Damage Proxy Map (DPM) depicting areas that are likely damaged by pyroclastic flows and lahars in Eastern Java, Indonesia due to the eruption of Semeru volcano starting on 4 Dec 2021. The map was derived from synthetic aperture radar (SAR) images acquired by the Copernicus Sentinel-1 satellites operated by the European Space Agency (ESA). The team compared the post-event image acquired on 7 Dec 2021 with pre-event images taken since 9 Aug 2021.

The image covers an area indicated by the large white polygon. Each pixel measures about 30 meters across. The color variation from light blue to dark blue indicates increasingly more significant surface change. Preliminary validation was done by comparing with the media reports. This damage proxy map should be used as guidance to identify damaged areas and may be less reliable over vegetated areas. For example, the scattered colored pixels over vegetated areas may be false positives, and the lack of colored pixels over vegetated areas does not necessarily mean no damage.

Sentinel-1 data were accessed through the Copernicus Open Hub and AWS Open Dataset of Copernicus Sentinel-1 data for the Asia region (https://registry.opendata.aws/sentinel1-slc-seasia-pds). The product contains modified Copernicus Sentinel data (2021), processed by ESA and analyzed by the Earth Observatory of Singapore - Remote Sensing Lab (EOS-RS), using the Advanced Rapid Imaging and Analysis (ARIA) system originally developed at NASA's Jet Propulsion Laboratory, California Institute of Technology, and modified at EOS-RS.

More map details and files at: http://eos-rs-products.earthobservatory.sg/EOS-RS_202112_Indonesia_Semeru_Volcano