Research on Three-dimensional Visual System in Water Conservancy Based on DEM

The DEM(Digital Elevation Model) technology, grid model algorithm and hierarchical design ideas were analyzed, We Discusses the Methods to process data, Partition Grid and Superposition 3D elements in the creative process of visual system in water conservancy.Used hierarchical design ideas to solve the issue that under different scales showed varying levels of detail.It can provide better image and intuitive information for the water conservancy project management.