Quantifying Tufa Growth Rates (TGRs) using Structure-from-Motion (SfM) Photogrammetry Topics: Image Processing and Pattern Recognition; Natural Phenomena Data Acquisition; Natural Resource Management; Photogrammetry; Spatio-Temporal Data Acquisition In Proceedings of the 6th International Conference on Geographical Information Systems Theory, Applications and Management GISTAM - Volume 1, 225-232, 2020