Avaliação de métodos para interpolação espacial de dados de precipitação

Abstract

AbstractInformation on the amount of rainfall is essential for the most varied sectors, such asagriculture and agroforestry. Despite this importance many areas are still not coveredby meteorological stations, which causes the lack of data. To meet this need there aremethods of spatial interpolation, which use the information of correlated points to esti-mate the value that does not exist in a certain area. Thus, this work aims to evaluatemethods for the interpolation of daily precipitation data. The interpolation techniquesused in the experiments were the methods: Inverse Distance Weighting; Ordinary Krig-ing; Random Forest. For the Random Forest two different configurations were used, onethat receives as input the coordinates, and another that receives thebufferdistance,which is one of the most recent pre-processing used in the literature for the RandomForest to estimate its values based on geographical reference. We used rainfall datafrom the 46 meteorological stations from the state of Pernambuco in the period from2013 to 2018, and to compare the precision of the generalization of the methods, weused theleave-one-outcross validation. In the results, the Inverse Distance Weightingpresented a better performance in its estimates, for all the metrics, and the RandomForest using coordinates obtained the second best result. Random Forest usingbufferdistance had a lower result in terms of its metrics, but the quality of visual spatializationproved to be superior by offering a visually smoother result than offered by RandomForest using coordinates.