Validação de uma Krigeagem Ordinária por meio do produto TRMM 3B43 de precipitação mensal: um estudo de caso para o Bioma Cerrado

Biome Cerrado is characterized by its high inter-seasonal variability. Precipitation is an important feature of this biome, and such parameter can be spatialized from point-based samples. In such context, this study aimed to validate the Ordinary Kriging (OK) interpolation technique via the use of TRMM 3B43 monthly precipitation product. It also aimed to compare two geostatistical models (optimized and non-optimized OK interpolation), as well as evaluate errors associated with the correlation between in situ and orbital data. Scatterplots and Normalized Root Mean Square Errors (NRMSE) were created for the models statistical analysis. Uncertainty maps were also produced in order to verify the visual quality of the models. It has been found that there is high correlation between the TRMM product and the optimized OK interpolation model (R2=0.64, NRMSE=0.07,p-value<0.01). Considering data variance of non-optimized OK, only 20% of the pixels fell into the highest variance range (6000-7587). TRMM and in situ inherent errors influenced the calibration and validation of both geostatiscal models, however, both were located within the statistical significant range of 1%. Overall, TRMM 3B43 product proved efficient in predicting Biome Cerrado precipitation which allowing the validation of geostatistical modelling for that area.