Research on Differential Tomography SAR Imaging of Urban Buildings -- Taking the Government Building in Bao'an District, Shenzhen as an Example

Journal: Journal of Building Technology DOI: 10.32629/jbt.v6i2.3170

Jianxu Wang¹, Long Li², Chonghui Zhang³

1. School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture
2. School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture; Shandong Institute of Geological Survey and Mapping
3. School of Geomatics and Urban Spatial Informatics, Beijing University of Civil Engineering and Architecture; Shandong General Team of China Building Materials Geological Exploration Center

Abstract

Differential SAR Tomography (D-TomoSAR), an extension of InSAR technology, integrates D-InSAR and TomoSAR to achieve imaging in the height-deformation rate (s-v) domain. It resolves SAR imaging layover issues and retrieves the elevation and deformation rate of scatterers within a pixel. Using the Bao'an District Government Building in Shenzhen as an example, this study applies D-TomoSAR for four-dimensional urban building imaging. Based on Persistent Scatterer (PS) points, the experiment involves interferometric processing and PS point selection to obtain differential interferogram sequences and PS points. The Orthogonal Matching Pursuit (OMP) algorithm is employed for D-TomoSAR imaging, reconstructing elevation-deformation rate backscattering profiles. Theoretical analysis and case studies assess resolution and reconstruction performance. Compared to traditional InSAR, D-TomoSAR retains high resolution while significantly improving scatterer reconstruction accuracy, achieving precise urban building deformation estimation. This study highlights the potential of D-TomoSAR for large-scale urban deformation monitoring applications.

Keywords

D-TomoSAR; PS; OMP; deformation

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