text: orldView-1 and WorldView-2 images
  (2019, DigitalGlobe) using the Surface Extraction from TIN-based
  Searchspace Minimization software (Noh & Howat, 2015) running on
  the University of Iowa Argon supercomputer. The DEMs are available
  at https://doi.org/10.5066/P9353101, and