To cite package ‘slopes’ in publications use:

  Lovelace R, Félix R, Talbot J, Matos G (2025). _slopes: Calculate
  Slopes of Roads, Rivers and Trajectories_. R package version 1.0.1,
  <https://github.com/ropensci/slopes>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {slopes: Calculate Slopes of Roads, Rivers and Trajectories},
    author = {Robin Lovelace and Rosa Félix and Joey Talbot and Gonçalo Matos},
    year = {2025},
    note = {R package version 1.0.1},
    url = {https://github.com/ropensci/slopes},
  }