Bulletin of Surveying and Mapping ›› 2025, Vol. 0 ›› Issue (11): 47-52,61.doi: 10.13474/j.cnki.11-2246.2025.1108

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UAV-HSfM modeling method and its empirical analysis in the complex mountainous areas of central Yunnan Plateau

ZHANG Chi1, GAN Shu1,2, YUAN Xiping2,3, LUO Weidong1,2, MA Chong1, LI Yi1   

  1. 1. School of Land and Resources Engineering, Kunming University of Science and Technology, Kunming 650093, China;
    2. Plication Engineering Research Center, Spatial Information Surveying and Mapping Technology in Plateau and Mountainous Areas Set by Universities in Yunnan Province, Kunming 650093, China;
    3. Key Laboratory of Mountain Real Scene Point Cloud Data Processing and Applications for Universities, West Yunnan University of Applied Science, Dali 671006, China
  • Received:2025-04-28 Published:2025-12-04

Abstract: As a key technique within 3D reconstruction technology,the structure from motion (SfM) algorithm enables 3D scene reconstruction when integrated with UAV imagery.To address the issues of error accumulation in traditional incremental SfM(ISfM) and the high computational complexity of global SfM (GSfM) optimization in drone-based 3D reconstruction,this paper proposes a hybrid drone modeling method (UAV-HSfM). This approach first estimates camera rotations using a global algorithm and then computes camera positions through an incremental algorithm,thereby optimizing the 3D reconstruction process.The study was conducted in a mountainous test area in the central Yunnan Plateau.The results demonstrate that:①The proposed method achieves more stable feature extraction;②The sparse point cloud exhibits both completeness in quantity and geometric accuracy; ③The elevation root mean square error (RMSE) of 0.056 m shows significant improvement,with a more concentrated error distribution.In conclusion,the UAV-HSfM method effectively combines the advantages of GSfM and ISfM,significantly enhancing the accuracy of 3D reconstruction in complex mountainous terrains.

Key words: 3D reconstruction, global SfM, incremental SfM, UAV-HSfM, UAV imagery

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