| AdjSD | Calculates standard deviation of bathymetry (a measure of rugosity) adjusted for slope |
| annulus_window | Creates annulus focal window |
| BPI | Calculates Bathymetric Position Index |
| circle_window | Creates circular focal window |
| classify_features_ff | Helper function factory to classify morphometric features |
| DMV | Calculates Difference from Mean Value (DMV) |
| erupt | Create georeferenced version of R's built in volcano dataset |
| explore_terrain | Interactive Shiny app to look at terrain attributes |
| kmax | Calculate max curvature |
| kmean | Calculate mean curvature |
| kmin | Calculate min curvature |
| knc | Calculate normal contour curvature |
| kns | Calculate normal slope line curvature |
| ku | Calculate unsphericity curvature |
| outlier_filter | Helper function to filter outliers from regression parameters using interquartile range |
| Pfit | Calculates multiscale slope and aspect using a local planar fit (IN DEVELOPMENT: DO NOT USE) |
| Qfit | Calculates multiscale slope, aspect, curvature, and morphometric features using a local quadratic fit |
| RelPos | Calculates Relative Position of a focal cell |
| RIE | Calculates Roughness Index-Elevation |
| SAPA | Calculates surface area to planar area rugosity |
| SlpAsp | Multiscale Slope and Aspect |
| SurfaceArea | Calculates surface area of a DTM |
| tgc | Calculate contour geodesic torsion |
| TPI | Calculates Topographic Position Index |
| VRM | Implementation of the Sappington et al., (2007) vector ruggedness measure |