To cite package ‘slopes’ in publications use:

Lovelace R, Félix R, Talbot J, Matos G (2026). slopes: Calculate Slopes of Roads, Rivers and Trajectories. R package version 1.0.1.9000, https://github.com/ropensci/slopes.

Corresponding BibTeX entry:

  @Manual{,
    title = {slopes: Calculate Slopes of Roads, Rivers and
      Trajectories},
    author = {Robin Lovelace and Rosa Félix and Joey Talbot and Gonçalo
      Matos},
    year = {2026},
    note = {R package version 1.0.1.9000},
    url = {https://github.com/ropensci/slopes},
  }