Topography correlated atmospheric delay correction in radar interferometry using wavelet transforms

Manoochehr Shirzaei, R. Bürgmann

Research output: Contribution to journalArticle

50 Citations (Scopus)

Abstract

Atmospheric delay is one of the major sources of error in repeat pass interferometry. We propose a new approach for correcting the topography-correlated components of this artifact. To this aim we use multiresolution wavelet analysis to identify the components of the unwrapped interferogram that correlate with topography. By using a forward wavelet transform we break down the digital elevation model and the unwrapped interferogram into their building blocks based on their frequency properties. We apply a cross-correlation analysis to identify correlated coefficients that represent the effect of the atmospheric delay. Thus, the correction to the unwrapped interferogram is obtained by down-weighting the correlated coefficients during inverse wavelet transform. We test this approach on real and synthetic data sets that are generated over the San Francisco Bay Area. We find that even in the presence of tectonic signals, this method is able to reduce the correlated component of the atmospheric delay by up to 75% and improves the signal in areas of high relief. The remaining part is most likely due to 3D heterogeneities of the atmosphere and can be reduced by integrating temporal information or using complementary observations or models of atmospheric delay.

Original languageEnglish (US)
Article numberL01305
JournalGeophysical Research Letters
Volume39
Issue number1
DOIs
StatePublished - 2012
Externally publishedYes

Fingerprint

radar interferometry
atmospheric correction
wavelet analysis
wavelet
radar
topography
interferometry
transform
digital elevation model
artifact
relief
San Francisco Bay (CA)
digital elevation models
tectonics
atmosphere
coefficients
cross correlation
artifacts
breakdown
atmospheres

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)
  • Geophysics

Cite this

Topography correlated atmospheric delay correction in radar interferometry using wavelet transforms. / Shirzaei, Manoochehr; Bürgmann, R.

In: Geophysical Research Letters, Vol. 39, No. 1, L01305, 2012.

Research output: Contribution to journalArticle

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