An aerial photogrammetry system and method integrating non-scanning lidar

Abstract

The invention discloses an aerial photogrammetric system integrated with a non-scanning laser radar and an aerial photogrammetric method. The system comprises the non-scanning laser radar, a CCD (Charge Coupled Device) digital camera, a positioning-orienting POS (Passive Optical Splitter) module and a control-storage module. The method comprises the following steps of carrying out multiple-laser-beam irradiation on a visual field range by the non-scanning laser radar based on a focal plane array, so as to determine the distances of many sampling points in a visual field; meanwhile, by utilizing pose data provided by the positioning-orienting POS module, resolving out the geodetic three-dimensional coordinate of each sampling point as ground control information of subsequent aerial photographic processing; collecting an aerial photogrammetric photo of the same visual field by the CCD digital camera, realizing aerial survey mapping according to the information, which is provided by the laser radar, of a ground control point in quick and low-cost manners. According to the aerial photogrammetric system integrated with the non-scanning laser radar and the aerial photogrammetric method, a conventional field ground control method is replaced by adopting the three-dimensional imaging by the non-scanning laser radar; a charting period can be greatly shortened; the cost is decreased; the mapping capacity of a zone which is severe in geographical environment is improved.

Description

technical field [0001] The invention relates to the field of aerial photogrammetry, in particular to an aerial photogrammetry system and method integrating non-scanning laser radar. Background technique [0002] Aerial photogrammetry is an important technical means to quickly obtain geographic information data, and then carry out basic surveying and mapping, geological survey, land and resources development and other businesses, and it is also one of the most important data sources for making and updating topographic maps. Aerial photogrammetry technology obtains the spatial three-dimensional coordinates of the corresponding object points by intersecting the projected beams of the same-named image points on the stereo image pair. In order to restore the spatial position and attitude of each projected ray on the photographic image at the time of photographic exposure, it is necessary to obtain the inner orientation elements of the aerial camera and the outer orientation eleme...

AI Technical Summary

Problems solved by technology

At present, the methods of POS-assisted aerial photogrammetry mainly include Direct Georeferencing (DG) and POS-assisted aerial triangulation (Integrated SensorOrientation, ISO): Direct Georeferencing can pass Directly process and error correct the POS measurement data to obtain the external orientation elements of the aerial camera and realize directional mapping, but it is necessary to correct the eccentricity component between the GPS antenna, IMU and the projection center of the aerial camera through cumbersome means and eccentric angle, otherwise it will greatly affect the accuracy of mapping. Even so, the accuracy of direct orientation method aerial survey still cannot meet the requirements of large-scale high-precision mapping; POS-assisted aerial triangulation method will correct the external orientation elements obtained according to IMU / DGPS measurement As the weighted observations of the block adjustment are brought into the calculation, higher-precision azimuth elements outside the aerial camera can be obtained. However, in order to improve the accuracy of mapping, a small number of ground control points still need to be introduced, which increases the mapping period and time to a certain extent. cost

[0004] In the process of realizing the present invention, the inventors found that the traditional aerial photogrammetry in the prior art generally has the defects of long mapping cycle, low efficiency, high cost and limited by terrain, which cannot effectively meet the requirements of national economic construction and national development strategy. The demand for geographic information data acquisition and the use of complex mechanical scanning units make the structure complex and other defects

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