WorldCanon

Notes

Different 'Modes of Travel', i.e. Walking, Horseback, Boat, have different limitations and optimal paths.

Considerations

Distance, Altitude, Gradient, "Roughness" of terrain, "Wilderness" (vs crossing inhabited countryside, well worn roads), cost of changing mode of travel (start/end of boat journy as segment of route).  Rest periods?

 Current roads plotting only cosiders distance and altitude, with a simple overhead for enter/exit water sections.

Reference Materials

MECHANICAL DETERMINANTS OF GRADIENT WALKING
ENERGETICS IN MAN - Y A. E. MINETTI, L. P. ARDIGO AND F. SAIBENE 

Ergonomic effects of load carriage on energy cost of gradient walk