Island-air triangular measuring method based on GPS/IMU positioning and orientating technology

Abstract

The invention relates to the fields of aerial photogrammetry and particularly relates to an island-air triangular measuring method based on a GPS / IMU (Global Position System / Inertial Measurement Unit) positioning and orientating technology. The technical scheme adopted by the invention is that an aerial photography system with high-precision GPS / IMU positioning and orientating equipment is used for carrying out three-dimensional aerial mapping for a target island and sea and a land and shore measuring region with a land control network, extracting joint points of images on the island and the land and shore and directly carrying out virtual joint point generation on fall-water images according to exterior orientation elements solved based on GPS / IMU data, thus realizing the air triangular measurement and calculation by adopting a bundle method and further solving exterior orientation elements of the island, the land and the shore and corresponding object point land coordinates. According to the island-air triangular measuring method disclosed by the invention, the difficult problem that the island measurement cannot be controlled is effectively solved, the foundation for large-medium proportional scale mapping of the island is laid; and meanwhile, the problem of aerial photogrammetry of other measuring regions with poor and single textures (such as deserts, grasslands and snow fields) can be effectively solved.

Description

technical field [0001] The invention relates to the field of aerial photogrammetry, in particular to an island air triangulation method based on GPS / IMU positioning and orientation technology. Background technique [0002] Aerial triangulation, also known as aerial triangulation, is a key technology and step in the process of aerial photogrammetry data processing. The position and attitude of , that is, to obtain the 6 outer orientation elements of each aerial photo: Modern aeronautical triangulation is based on the beam method, that is, through iterative adjustment of the outer orientation elements of overlapping aerial photos, the spatial intersection of beams with the same name is realized, so as to finally determine the outer orientation elements of each aerial photo. The mathematical formula used is the collinear equation: the object point in the object space, the projection center of the aerial camera lens and the imaging point of the object point on the aerial photo...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is: there is no control point on the island, a large number of aerial photos "fall into the water", and the texture of the sea area near the island is poor, and it is impossible to obtain enough connecting points to construct an area network to realize aerial triangulation.

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