Multi-precision DEM data difference smooth fusion method and system

The invention provides a multi-precision DEM (Digital Elevation Model) data difference smooth fusion method and system. The method comprises the steps of collecting topographic data of a scene where a transformer substation and a cable tunnel are located through an unmanned aerial vehicle, and obtaining topographic image data of the scene where the transformer substation and the cable tunnel are located within a calibrated topographic range; generating a first DEM model and a second DEM model according to the topographic image data of the scene where the transformer substation and the cable tunnel are located; and fusing the first DEM model and the second DEM model by using a difference method to obtain a fused digital elevation model. The system comprises modules corresponding to the steps of the method. 本发明提出了一种多精度DEM数据差值平滑融合方法和系统。所述方法包括：通过无人机采集变电站和电缆隧道所处场景的地形数据，在标定地形范围内获取所述变电站和电缆隧道所处场景的地形影像数据；根据变电站和电缆隧道所处场景的地形影像数据生成第一DEM模型和第二DEM模型；利用差值法将第一DEM模型和第二DEM模型进行融合，获得融合后的数字高程模型。所述系统包括与所述方法步骤对应的模块。