Rapid Extreme Tropical Precipitation and Flood Inundation Mapping Framework (RETRACE): Initial Testing for the 2021–2022 Malaysia Flood

The 2021–2022 flood is one of the most serious events in Malaysian history, with approximately 70,000 victims evacuated daily, 54 killed and total losses up to MYR 6.1 billion. From this devastating event, we realized lack extreme precipitation inundation information, which a common problem tropical regions. Therefore, developed Rapid Extreme TRopicAl preCipitation mapping framEwork (RETRACE) by utilizing: (1) cloud computing platform, Google Earth Engine (GEE); (2) open-source satellite images from missions such as Global Precipitation Measurement (GPM), Sentinel-1 SAR Sentinel-2 optical satellites; (3) victim information. framework was demonstrated Malaysia flood. preliminary results were satisfactory an optimal threshold five for using data, accuracy inundated floods 70%. daily 230 mm/day observed resulted area 77.43 km2 Peninsular Malaysia. This can act useful tool local authorities scientists retrace information relatively short period management mitigation strategy development.