On the effect of horizontal deformation on InSAR subsidence estimates.

Conference paper (2009)

Authors

S. Samiei Esfahany Mathematical Geodesy and Positioning -

R.F. Hanssen Mathematical Geodesy and Positioning -

K. van Thienen-Visser TNO

A.G. Muntendam-Bos TNO

Affiliation

External organisation

InSAR Subsidence Persistent scatterer Horizontal de-formation

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Published Date

2009

Language

English

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Abstract

One of the limitations of InSAR is that it is only capa-ble of measuring a 3D projection of a real deformation vector on the radar line of sight. Therefore it is not possi-ble to retrieve the full displacement vector from a single InSAR measurement. The optimal solution for this limi-tation is a combination of InSAR measurements from dif-ferent imaging geometries. However, this solution is not applicable in areas where InSAR data are available in one particular geometry only. In this paper, a new approach will be discussed for 3D decomposition of InSAR defor-mation measurements for the case of subsidence. We use the hypothesis of a physical relation between horizontal displacement and vertical deformation. Using this hy-pothesis, we propose an iterative strategy for 3D decom-position of InSAR subsidence measurements. The pro-posed approach is tested on the PSI results of a complex subsidence field in Friesland, the Netherlands. Finally, the results are validated by comparison with available lev-eling data.