After landslides, with much of the action taking place underground far from view except for the final defining event of a collapsing slope, you might well believe that modeling topography, which we can all see and stand on, probably would not pose any difficulties. Reconsider that thought. Typically, it has been neither feasible nor economically viable to measure every square meter let alone every square centimeter of topography. New technology, such as Lid AR (light detection and ranging), has its ability to quickly produce accurate, high-resolution topographic data, but is tending to produce overly dense data sets.