Satellite images for rainfall estimation in Espírito Santo State, Brazil
DOI:
https://doi.org/10.5327/Z2176-94782228Keywords:
tropical rainfall measuring mission; global precipitation measurement; rain gauges; remote sensing.Abstract
Due to the inadequate distribution, scarcity, or operational problems of rain gauges or pluviographs, remote sensing has been considered a relevant alternative for characterizing the regime and measuring the rainfall intensities. The present paper evaluated estimates of annual precipitation totals in the state of Espírito Santo, Brazil, established from conventional monitoring conducted by rain gauges and the manipulation of satellite images. Additionally, it assessed the quality of estimates during El Niño and La Niña years. For the study, the 3B42 version seven products from the Tropical Rainfall Measuring Mission (TRMM) satellite and the 3IMERGDF version six products from the Global Precipitation Measurement (GPM) satellite were used. These satellites were developed through a partnership between the National Aeronautics and Space Administration and the Japan Aerospace Exploration Agency. Historical series from the years 2001–2019 of 83 rain gauge stations installed and operating in the state of Espírito Santo and its surroundings were analyzed, along with satellite images from TRMM and GPM for spatial grids of 25 and 10 km, respectively. The parameters recommended by the International Precipitation Working Group were used to conduct the analysis. The TRMM satellite performed better during La Niña periods (R²=0.941; root mean square error [RMSE]=44.21 mm; ME=14.87 mm), surpassing the results observed in El Niño (R²=0.885; RMSE=141.5 mm; ME=−87.14 mm). Although the GPM satellite performed stably between El Niño and La Niña periods, with systematic underestimation (bias≈0.93) and similar ME (ME≈79 mm), it showed a lower correlation with rain gauge records (R²≈0.77) than the TRMM satellite. The results indicated that the use of satellite images was a consistent alternative for the appropriation of annual precipitation totals and that the TRMM satellite presented more accurate estimates, both for long-term analysis and for the El Niño and La Niña periods.
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