This repository contains the data and source code used to produce the results presented in: Uieda, L., Siqueira-Macedo, A. (2026). Gradient-boosted spline interpolation of geophysical data. This first version contains a dataset that will be used in the paper. Following versions will contain the analysis code, figures, and manuscript as well. License The dataset in file 1067_XYZ.zip was downloaded from the GeoSBG portal of the Brazilian Geological Survey (SGB). It is distributed by SGB under the CC-BY-NC license and is redistributed here under the same license. All Python source code (including .py and .ipynb files) is made available under the MIT license. You can freely use and modify the code, without warranty, so long as you provide attribution to the authors. See LICENSE-MIT.txt for the full license text. The manuscript text (including all LaTeX files), figures, and data/models produced as part of this research are available under the Creative Commons Attribution 4.0 License (CC-BY). See LICENSE-CC-BY.txt for the full license text.