@misc{indiciaed8a28c1a70cb,
  title = {Creation of digital contours that approach the characteristics of cartographic contours},
  author = {Dean J. Tyler and Susan K. Greenlee},
  year = {2012},
  doi = {10.3133/sir20125167},
  url = {https://pubs.usgs.gov/publication/sir20125167},
  note = {Source identifier: sir20125167}
}