Non-point source pollution ecological interception engineering optimization method based on limited space recognition

The invention relates to a non-point source pollution ecological interception engineering optimization method and system based on limited space recognition, and belongs to the field of agricultural environment protection. The method comprises the steps that partition division is carried out based on an engineering area map, and available limited spaces, including branch creek water body spaces and other limited spaces, in all partitions are recognized; and calculating a limited space proportion and a land-water boundary curvature of each subarea according to the area of the available limited space in each subarea and the land-water boundary length, and carrying out differentiated transformation on the non-point source pollution ecological interception tail end purification project in each subarea according to the limited space proportion and the land-water boundary curvature. According to the method, concepts of the limited space proportion and the land-water boundary curvature and four corresponding indexes