永久基本农田中非耕地地块补划方法研究OA

The designation of permanent basic farmland is a crucial measure in China's land management.However,some historically delineated parcels are currently non-cultivated land or low-quality cropland,which need to be removed and replaced with existing cultivated land beyond permanent basic farmland,following principles such as areal"equivalence"and"contiguous aggregation".Existing methods for parcel supplementation often operate at the scale determined by the selected individual cultivated land parcels,making it difficult to simultaneously satisfy the requirements of precise area matching and spatial adjacency.To solve the problem,this study proposes a parcel supplementation method based on the relative positional relationships of three triangle types within a triangular network generated by the Delaunay Triangulation.Firstly,Delaunay Triangulation is employed to partition irregular polygons representing cropland into multiple triangular units.Subsequently,the main structure and branches of each parcel are identified by using"cross triangle"(also referred to as"bridging triangles").Sub-parcels belonging to branch structures are prioritized for supplementation,and candidate triangles are selected based on area constraints and adjacency priority principles.When the cumulative area of the selected candidate triangles exceeds the target supplementation area,the current triangle is subdivided employing the bisection method.Finally,the parcels requiring supplementation are processed iteratively to form a complete parcel supplementation scheme.Research results indicate that this method can ensure the supplemented area is no less than the removed area,while improving the spatial contiguity between the supplemented parcels and the existing permanent basic farmland within the cultivated land.It significantly enhances adjacency,reduces the number of fragmented patches in the corresponding map data,effectively resolves the dual constraints of area and layout in the balance of permanent basic farmland adjustments,and improves the feasibility and spatial optimization level of the supplementation results.This holds significant importance for advancing related research in the fields of cultivated land protection and territorial spatial planning.