Joint positioning method of airborne lidar point cloud and high-resolution imagery for spatial points

Abstract

A joint positioning method for spatial points by means of onboard LiDAR point cloud and high resolution images includes the steps: denoising original LiDAR data; generating a high-precision DEM (digital elevation model); manually supplementing elements of exterior orientation of images acquired by high-precision POS (point-of-sale) data; calculating object-side coordinates (X, Y and Z) of identical points by means of multi-image forward intersection after calculating initial values by means of two-image forward intersection by the aid of two optional points among the selected identical points; and obtaining precise object-side coordinates (X, Y and Z') corresponding to the identical points by the aid of the object-side coordinates of the identical points solved by means of previous multi-image forward intersection. By means of multi-image forward intersection realized on the premise of elevation constraint of the LiDAR point cloud, object-side coordinates of acquired image points are quite high in plane precision and elevation precision.

Description

technical field [0001] The patent of the present invention relates to the technical field of airborne LiDAR data processing, in particular to a method for joint precise positioning of spatial points by integrating LiDAR point cloud data and high-resolution images. Background technique [0002] Airborne LiDAR is a new type of active aerial remote sensing earth observation technology. By carrying a high-resolution digital camera, laser point clouds and high-resolution aerial images can be collected synchronously in one flight. Because the POS system carried by airborne LiDAR It has inertial navigation and GPS positioning functions, so it can directly obtain high-resolution three-dimensional point cloud information and high-resolution aerial photos and its outer orientation elements. In theory, high-precision direct geographic positioning can be performed, but if there is no internal work In the case of long and cumbersome aerial triangulation processing the overall adjustment,...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the problem that the plane accuracy and elevation accuracy of the traditional direct geolocation method based on the intersection of two slices is not high, the present invention uses the airborne LiDAR with a high-resolution CCD camera to collect high-precision images synchronously during flight. The characteristics of laser point clouds and high-resolution aerial images, in order to achieve the goal of quickly obtaining high-precision direct geolocation, the elevation information of laser point clouds is introduced to impose elevation constraints on the adjustment results of multi-slice forward intersection of high-resolution images , so as to quickly obtain the high-precision spatial coordinates of the image point, it is a high-precision, fast direct geolocation method that integrates the advantages of multi-sensor data

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