Information simulation display method and system of three-dimensional geographic information system

The invention provides an information simulation display method and system for a three-dimensional geographic information system, and the method comprises the steps: transmitting a pulse wave beam to a detection earth surface, and obtaining a three-dimensional earth surface point cloud data set through a pulse echo wave beam; for each three-dimensional earth surface point, determining the point cloud neighborhood density of the three-dimensional earth surface point according to the point cloud neighborhood and the pulse beam, and obtaining the point cloud neighborhood density of all the three-dimensional earth surface points; determining a point cloud noise identification threshold according to the three-dimensional earth surface point cloud data set and the pulse echo beam, and performing denoising according to the point cloud noise identification threshold to determine a denoised three-dimensional earth surface point cloud data set; determining a reflectivity factor of each de-noised three-dimensional earth