Mean elevation plane triangulated irregular network-based topographic map elevation sparsing algorithm

The invention relates to a mean elevation plane triangulated irregular network-based topographic map elevation sparsing algorithm. The sparsing algorithm comprises the following steps of constructinga triangulated irregular network; obtaining a mean elevation plane; setting a threshold; reconstructing the triangulated irregular network; calculating an elevation gradient; screening feature elevation points; obtaining an extreme value of the elevation points; setting a height difference and a distance threshold; and deleting the triangulated irregular network, wherein the triangulated irregularnetwork (TIN) refers to the triangulated irregular network generated by adopting a Delaunay triangulated network. According to the triangulated irregular network-based topographic map elevation pointsparsing algorithm, the elevation points capable of remarkably reflecting topographic relief change are reserved as far as possible, and the topographic change in a sparsing range is better expressed; the elevation points can