Validação dos níveis de água fornecidos pelos satélites altimétricos Jason 1, 2 e 3 na Bacia Amazônica

Abstract

In recent years, space altimetry has contributed to improve the development of hydrological studies, overcoming the lack of data and improving studies in the area of hydrology, obtaining information in a homogeneous, continuous and frequent way on the Amazon basin which has a complex seasonal variability. The National Water Agency (ANA) has data from different linymetric stations (in situ) throughout the national territory, but they have limitations on the installation and maintenance of the stations. Data from the Jason-1/2/3 satellites complements the measurements of in situ stations, especially in regions where there are no in situ measurements and / or measures were discontinued. In this study, external validation (corresponding to the altimetric estimation of water levels of the Jason-1/2/3 satellites with data obtained at linimetric stations) and internal validation (corresponding to the altimetric estimation of water levels at crossing points of two the Jason-1/2/3 satellite) for the Amazon Basin, through the RMS (Root Mean Score) calculation. The data from the Jason-1/2/3 satellites, together with the manual selection, presented similar results to the time series obtained in linimetric stations with total RMS values for all stations below 0.40m for the external and internal validations of the satellites Jason-1/2/3