Need a smoother surface? This paper introduces SSRFPACK, a Fortran 77 software package designed to construct smooth interpolatory or approximating surfaces for data values distributed across the surface of a sphere. The software employs automatically selected tension factors, which are intended to preserve the shape of the data and prevent the overshoot or undershoot frequently associated with steep gradients. This software package is valuable for a wide variety of applications requiring the creation of smooth surfaces from scattered data points, providing an effective solution for visualization and modeling. This tool represents a valuable resource for researchers and practitioners working with spherical data.
ACM Transactions on Mathematical Software publishes high-quality, peer-reviewed articles on mathematical software. The presentation of SSRFPACK in this journal is fitting because it provides a valuable tool for constructing smooth interpolatory surfaces, offering a solution for various applications involving spherical data. The work will be of great interest to the journal's readership.