Image implementation control method and system based on BIM and GIS engine fusion

The invention belongs to the technical field of image processing, and relates to an image implementation control method and system based on BIM and GIS engine fusion, and the method comprises the steps: processing a BIM model, building a unified data platform, and associating building model information in the BIM model with geographic position information in a GIS model; the BIM model processing comprises a model segmentation stage, a primary shelling stage, a multi-stage refining stage, a detail level management stage, an LOD management stage and a visual rendering stage. According to the method, a multi-stage shelling algorithm is adopted, so that the smoothness of BIM model data is improved, and the model can be displayed completely and smoothly; business functions of a BIM engine and a GIS engine are fused, a user can carry out geographic position information business function operation on a building project through the GIS engine, building information is checked on a fusion platform through BIM engine mo