What we really want* is 3d augmented reality mapping goggles that present the terrain and route directly into your vision, aligned with your natural vision... Something I've been suggesting since 1997...
* or do we...? 'follow the yellow brick road' is only good if the brick road is correct... Garbage in, garbage out...
Given accurate 3D data, and details of the surface vegetation, etc, we could design a system to guide us through the landscape, based on any number of optimisation selections; time, energy, pretty views, etc.