The invention relates to the technical field of three-dimensional geographic modeling, in particular to a
land utilization planning auxiliary method and
system based on a 3D
terrain model, and the method comprises the following steps: obtaining
point cloud and elevation information, converting the information into a
terrain curved surface, discretizing the information into a
voxel grid, analyzing a planning index, converting the planning index into a geometric constraint boundary, and traversing to construct a planning
voxel field. Calculating earthwork digging and filling requirements and sunshine hours to generate an evaluation matrix, correcting the building
voxel distribution and finely adjusting the
terrain elevation. According to the method, terrain refined expression is realized by using an
octree segmentation
algorithm, indexes such as a plot ratio are converted into three-dimensional space geometric constraints, site suitability is evaluated through
connectivity analysis, and building
layout and earthwork balance are automatically optimized by adopting morphological operation, so that the problems of lack of space intuition and error accumulation in traditional two-dimensional planning are solved; the planning calculation precision and decision scientificity under the complex terrain are remarkably improved, and dynamic adjustment and visual expression of the scheme are achieved.