Assessment of InSAR tropospheric signal correction methods

Saeid Haji-Aghajany, Yazdan Amerian*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

2 Citations (Scopus)
19 Downloads (Pure)

Abstract

Tropospheric signals are considered as one of the most important performance limitations to compute the deformations caused by earthquake, subsidence, volcano, and so on using interferometric synthetic aperture radar (InSAR) technique. Various correction methods have been proposed to reduce the effect of these signals in displacement fields in previous research works. Different types of correction methods are used to estimate the tropospheric signal on InSAR observations. For this purpose, meteorological data derived from ERA-Interim (ERA-I) data, Weather Research and Forecasting (WRF) model, and Advanced Synthetic Aperture Radar/ENVISAT acquisitions are used. ERA-I reanalysis data and a locally run WRF model are also used to compute the tropospheric corrections with integral of the air refractivity method, which is called integration method. Also, the ability of ray tracing techniques to reduce the effect of the tropospheric signal in unwrapped interferogram is compared with integration method. To carry out a comprehensive study, the effects of correction methods are studied in two different areas. The results of the ray tracing methods have a significant difference with the results obtained from integration method and are more efficient when the weather condition between two satellite acquisitions is more different. The results show that the three-dimensional ray tracing method can reduce the root-mean-square error of the results up to 4.8 cm compared to the integration methods.

Original languageEnglish
Article number044503
Number of pages13
JournalJournal of Applied Remote Sensing
Volume14
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • ERA-Interim
  • interferometric synthetic aperture radar
  • ray tracing
  • tropospheric signal
  • Weather Research and Forecasting

Fingerprint

Dive into the research topics of 'Assessment of InSAR tropospheric signal correction methods'. Together they form a unique fingerprint.

Cite this