Method for measuring terrain of coastal shallow water area by using a low-altitude unmanned aerial vehicle

Abstract

The invention discloses a method for measuring the terrain of a coastal shallow water area by using a low-altitude unmanned aerial vehicle. The method comprises the following steps: 1, obtaining tide level data of a measured area; using a low-altitude unmanned aerial vehicle for obtaining a measuring area image, and obtaining an underwater digital earth surface model and a route waypoint diagram before correction after processing; 2, generating a route tide level model; 3, obtaining a water depth data set before correction; 4, obtaining actual water depth data h water depth at a corresponding position during aerial survey of the unmanned aerial vehicle; 5, substituting multiple pairs of h water depth and h before correction into a simplified water depth refraction correction formula h water depth = k * h before correction, and obtaining a refraction correction proportion constant k; 6, multiplying the water depth data set before correction by a refraction correction proportion constant k to obtain a water depth data set after correction; and 7, performing one-to-one correspondence subtraction on the route tide level model and the corrected water depth data set to obtain shallow water area underwater topographic data. According to the invention, rapid and high-precision measurement of the coastal shallow water terrain can be realized.

Description

technical field [0001] The invention relates to the field of marine surveying and mapping, in particular to a method for measuring the topography of coastal shallow water areas by using a low-altitude unmanned aerial vehicle. Background technique [0002] Underwater topographic surveying is a basic work of marine surveying and mapping, and it is also a specific survey in engineering surveying. Mapping work. Underwater topographic survey is the first step in exploring and researching and developing and protecting oceans and other waters. It is of great significance for mastering the law of terrain evolution, hydraulic construction and military research. Conventional underwater topographic surveys generally use single-beam or multi-beam depth sounders, both of which depend on the ship, and have certain restrictions on the shallowest water depth in the survey area. When measuring coastal shallow water areas, affected by tides and water depth, it is easy to Stranding, rocking,...

AI Technical Summary

Problems solved by technology

The calculation process of water depth inversion from multispectral images is complex and the accuracy is low, which cannot meet the requirements of large-scale underwater topographic survey

Stereo image dual-media measurement of water depth has more theoretically studied the feasibility of this method, but the calculation process is also complicated, the steps are cumbersome, and engineering application is very difficult

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