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An update of Xavier, King and Scanlon (2016) daily precipitation gridded data set for the Brazil

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The objective of this work is to present an update to the daily precipitation gridded set developed by Xavier, King and Scanlon (2016), where the previous dataset is namely v2 and the new one is v2.1. The v2.1 gridded data uses 9,259 rain gauges relative to 3,630 in v2. We also extend the period of the gridded data by two years (v2.1 is from Jan/01/1980 to Dec/12/2015 while v2 is from Jan/01/1980 to Dec/12/2013). In the generation of v2.1 gridded data set, we tested two interpolation methods: the angular distance weighting (ADW), and the inverse distance weighting (IDW). We selected the ADW interpolations because it presents better skill score in the cross-validation analysis. The v2.1 gridded data are derived using 155% more rain gauges than v2. Almost all skill scores from cross-validation of v2.1 are better than those from v2, and we make this update of the gridded set available to the community.