3D reconstruction of offshore islands based on sparse controlled oblique photography

doi:10.13474/j.cnki.11-2246.2025.0920

Abstract

Abstract: In order to solve these problems that the complex terrain and insufficient coordinate reference service of offshore islands,the layout and measurement of image control points in the oblique photogrammetry for offshore islands with high cost,high labor intensity,high risk coefficient and low work efficiency.This paper studies a method for achieving oblique photogrammetry of offshore islands through sparse control.Firstly,lay out a small number of control points according to the area and topographic features of each island and obtain high-precision flight data of position and orientation through the joint solution based on the CORS,GNSS and IMU data of unmanned aerial vehicles.Secondly,the 3D real model is constructed through technologies such as aerial triangulation and image matching.Finally,this paper provides a detailed introduction to the application of this method in island surveying taking Miaowan Island,Niutou Island and Wenweizhou Island in Zhuhai city as experimental cases.The obtained results,after being subjected to precision detection,have been confirmed to meet the accuracy requirements for large scale topographical mapping.This method is practical and feasible,providing an effective approach and reference for the surveying work on offshore islands.

Key words: offshore islands, real 3D, UAV, oblique photogrammetry, sparse control

CLC Number:

P237

ZENG Yicheng, ZHANG Yihe, DING Jianxun, LI Wangmin, LI Xiulong. 3D reconstruction of offshore islands based on sparse controlled oblique photography[J]. Bulletin of Surveying and Mapping, 2025, 0(9): 126-130.

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