GIS-fused three-dimensional model generation method and system and storage medium

The invention relates to the field of simulation models, and discloses a GIS-fused three-dimensional model generation method and system and a storage medium. The method comprises the following steps: acquiring a three-dimensional point cloud of a target object; based on the plurality of height ranges of the three-dimensional point clouds, respectively establishing grids of the plurality of height ranges, and dividing part of the point clouds of the height ranges into the corresponding grids; grouping the partial point clouds to obtain a plurality of grouped point clouds; performing linear analysis on the grouped point clouds according to the grids where the grouped point clouds are located, and determining linear information of the grouped point clouds; determining contour boundaries of partial point clouds according to the linear information of the plurality of grouped point clouds; and creating a three-dimensional model of the target object according to the contour boundaries of the plurality ...