| akcoast | Alaska coastline |
| get_barrier_segments | Identify track points that intersect with a barrier polygon |
| land_barrier | land barrier |
| pipe | Pipe operator |
| poi | points of interest |
| prt_extend_path | Extend a path to include given start and end points |
| prt_nearestnode | Find the nearest node for start and end points in segs_tbl |
| prt_reroute | Re-route track points around barrier feature |
| prt_shortpath | Calculate the shortest path through a visibility network... |
| prt_trim | Trim tracks to start and end outside barrier |
| prt_update_points | Update track points with fixed geometry |
| prt_visgraph | Create a visibility graph |
| spatial_predicates | Spatial predicates |
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