Two-step ODETLAP and induced terrain for improved geographical data reconstruction

Abstract

Data from other geographical layers can also be used to refine the induced terrain. For example, known water flow directions can be used to correct river heights which may have been reconstructed incorrectly with height samples alone. This improves the accuracy by 1-4 percentage points. Meanwhile, known non-river locations can be protected from being river locations in the reconnection results by raising their heights to a level unreachable by any water. While effective in boosting accuracy by around 5 percentage points, this scheme also makes it simple to switch among river derivation schemes with different execution speeds and hydrographical consistency constraints.