To cite package ‘nycterrain’ in publications use:

  Healy K (2026). _nycterrain: NYC Bare-Earth Terrain Elevation_. R
  package version 0.0.1.9000, <https://github.com/kjhealy/nycterrain>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {nycterrain: NYC Bare-Earth Terrain Elevation},
    author = {Kieran Healy},
    year = {2026},
    note = {R package version 0.0.1.9000},
    url = {https://github.com/kjhealy/nycterrain},
  }