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中南大学地球科学与信息物理学院,湖南 长沙,410083
Received:21 July 2025,
Published:05 July 2026
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林其炜,李志伟,付海强.顾及地形特征的InSAR和光学DSM逐步回归融合[J].武汉大学学报(信息科学版),2026,51(7):1494-1506.
LIN Qiwei,LI Zhiwei,FU Haiqiang.Stepwise Regression Fusion of InSAR and Optical DSM Considering Terrain Features[J].Geomatics and Information Science of Wuhan University,2026,51(7):1494-1506.
林其炜,李志伟,付海强.顾及地形特征的InSAR和光学DSM逐步回归融合[J].武汉大学学报(信息科学版),2026,51(7):1494-1506. DOI:10.13203/j.whugis20250131
LIN Qiwei,LI Zhiwei,FU Haiqiang.Stepwise Regression Fusion of InSAR and Optical DSM Considering Terrain Features[J].Geomatics and Information Science of Wuhan University,2026,51(7):1494-1506. DOI:10.13203/j.whugis20250131
合成孔径雷达干涉测量(interferometric synthetic aperture radar
InSAR)和光学摄影测量是生成数字表面模型(digital surface model
DSM)的两种主要技术,但InSAR技术容易受到几何畸变影响,光学立体测量在云雨等恶劣天气下的观测能力受限。多源DSM融合能有效利用数据互补的优势,可提升单一数据源数据生成DSM的质量。然而,传统加权平均融合方法的权重分配依赖先验信息,且未充分考虑地形特征对高程误差的影响。因此,提出了一种顾及地形特征的InSAR和光学DSM逐步回归融合方法。以InSAR和光学DSM为研究对象,提取坡度、坡向、粗糙度等地形特征参数,采用逐步回归方法建立高程误差与地形特征间的回归模型,并基于模型自适应计算融合权重。采用美国山区的TanDEM-X DSM和AW3D30 DSM数据开展融合实验,并在两个实验区对结果进行了测试。实验结果表明,所提方法在两个测试区域中的均方根误差分别降低了14.3%和18%,优于传统加权平均融合方法;相比于随机森林方法,所提方法在测试区域达到更高融合精度的同时,具有一定的可解释性。
Objectives
2
Interferometric synthetic aperture radar (InSAR) and optical photogrammetry are two primary techniques for generating digital surface model (DSM). However
InSAR is susceptible to geometric distortion
while optical photogrammetry is limited by cloudy and rainy weather. The fusion of multi-source DSM can effectively leverage the complementary advantages of the data to enhance the quality of DSM derived from a single data source. Traditional weighted average fusion methods rely on prior information for weight allocation and don't adequately consider the impact of terrain features on elevation errors. There is a need to develop a new fusion method.
Methods
2
This paper proposes a stepwise regression fusion method for InSAR and optical DSM that takes topographic features into account. Taking InSAR and optical DSM as research subjects
and considering the commonalities and differences in error characteristics between InSAR and optical DSM
terrain geometric features
land cover features
and elevation difference features are extracted as training samples in the training area. Subsequently
the stepwise regression method is employed to construct a regression model between elevation errors and terrain features by incrementally adding or removing variables. Elevation errors are then predicted to adaptively determine the fusion weights. Finally
fusion experiments are conducted using TanDEM-X DSM and AW3D30 DSM data from mountainous areas in the United States
and the results are tested in two different experimental regions.
Results
2
The proposed method outperforms the traditional weighted averaging fusion method. The root mean square errors decrease by 14.3% and 18% in the two test regions
respectively. Compared with the random forest method
the proposed method achieves higher fusion precision while maintaining favorable interpretability.
Conclusions
2
The proposed method effectively improves the quality of fused DSM by utilizing terrain features and achieves favorable performance in complex terrain areas
providing an effective solution for multi-source DSM fusion.
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