Shen, L orcid.org/0000-0003-3640-5133, Hooper, A orcid.org/0000-0003-4244-6652 and Elliott, J orcid.org/0000-0003-2957-4596 (2019) A Spatially Varying Scaling Method for InSAR Tropospheric Corrections Using a High‐Resolution Weather Model. Journal of Geophysical Research. Solid Earth, 124 (4). pp. 4051-4068. ISSN 2169-9356
Abstract
Variation in tropospheric delay is a major limiting factor on the accuracy of interferometric synthetic aperture radar (InSAR) measurements. This is particularly the case when deformation and topography are correlated. To address limitations of previous InSAR tropospheric correction methods, here we present a new approach that combines the use of both external weather model data and the interferometric phase. We assume that vertical refractivity profiles calculated from a high‐resolution weather model data can generally describe the form of the relationship between tropospheric delay and height but that the magnitude can be incorrect. We estimate a magnitude correction by scaling the original delays to best match the interferometric phase. We validated our new method using simulated data and demonstrate that both coseismic and interseismic signals can be separated from strong tropospheric delays. We also applied our algorithm to the central portion of the Altyn Tagh Fault in northern Tibet, where deformation correlates strongly with topographic relief of 6,000 m, and show that the derived velocity field is more internally consistent and agrees better with independent Global Positioning System measurements.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2019. American Geophysical Union. All Rights Reserved. Reproduced in accordance with the publisher's self-archiving policy. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Funding Information: | Funder Grant number NERC No External Reference Royal Society UF150282 |
Depositing User: | Symplectic Publications |
Date Deposited: | 15 Mar 2019 11:02 |
Last Modified: | 14 Aug 2019 00:43 |
Status: | Published |
Publisher: | American Geophysical Union |
Identification Number: | 10.1029/2018JB016189 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:143702 |