Geodetic TomoSAR

Fusion of SAR imaging geodesy and TomoSAR for 3D absolute scatterer positioning

Conference paper (2014)

Authors

Xiao Xiang Zhu Technische Universität München
Christoph Gisinger Technische Universität München
R.F. Hanssen Mathematical Geodesy and Positioning - CEG
Richard Bamler Technische Universität München
Research Group
Mathematical Geodesy and Positioning (CEG) (TU Delft)
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Published Date

04-11-2014

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Remote Sensing

Research Group

Mathematical Geodesy and Positioning

Abstract

In this paper, we propose a framework referred to as 'geodetic TomoSAR' that fuses the SAR image geodesy and TomoSAR approaches to obtain absolute 3D positions of a large amount of natural scatterers. The methodology is applied on four Very High Resolution (VHR) TerraSAR-X spotlight image stacks acquired over the city of Berlin. Since the TomoSAR estimates are referred to the identical reference point whose absolute 3D positions are retrieved by means of Stereo-SAR, the point clouds from ascending and descending orbits are automatically fused. To assess the accuracy of the position estimates, the resulting absolute shadow-free 3D TomoSAR point clouds are compared to a DSM obtained by airborne LiDAR.