@misc{indiciae2ded6f44e36b,
  title = {Digital computer terrain mapping from multispectral data},
  author = {Harry W. Smedes and Kenneth L. Pierce and Marc G. Tanguay and Roger M. Hoffer},
  year = {1970},
  doi = {10.2514/3.30097},
  url = {https://pubs.usgs.gov/publication/70226548},
  note = {Source identifier: 70226548}
}