A Preliminary Assessment of the GSMaP Version 08 Products over Indonesian Maritime Continent against Gauge Data

This study is a preliminary assessment of the latest version Global Satellite Measurement Precipitation (GSMaP 08) data, which were released in December 2021, for Indonesian Maritime Continent (IMC), using rain gauge (RG) observations from 2021 to June 2022. Assessments carried out with 586 stations point-to-pixel approach through continuous statistical and contingency table metrics. It was found that coefficient correlation (CC) GSMaP 08 products against RG varied between low (CC = 0.14–0.29), moderate 0.33–0.45), good 0.72–0.75), hourly, daily, monthly scales tendency overestimate, indicated by positive relative bias (RB). Even though hourly data still low, can capture diurnal patterns IMC, as compatibility estimated peak times precipitation amount frequency. also manage observe heavy rainfall, detection (POD) values daily ranging probability 0.71 0.81. Such POD value followed relatively false alarm ratio (FAR) (FAR < 0.5). However, overestimates light rainfall (R 1 mm/day); consequence, it consecutive wet days (CWD) number ≥ mm (R1mm) indices, underestimates dry (CDD) extreme index. accuracy depends on IMC’s topographic conditions, especially real-time data. Of all evaluated, outperformed post-real-time non-gauge-calibrated (GSMaP_MVK), gauge-calibrated (GSMaP_Gauge), near-real-time (GSMaP_NRT_G), (GSMaP_NRT), (GSMaP_Now_G), (GSMaP_Now). Thus, have potential observing IMC faster latency.