Analysis of Ocean Tide Loading in Differential InSAR Measurements

Peng, Wei; Wang, Qijie; Cao, Yunmeng

doi:10.3390/rs9020101

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…A predicted differential InSAR study has shown that OTL displacement is comparable to both InSAR accuracy and displacement rates for targets near coastlines with a predicted OTL displacement gradient of 3 cm per 100 km till 200 km away from the coast [54]. Another study eliminates OTL effect in Differential InSAR interferogram using FES2004 tide model after the estimation of orbit errors using GPS precise point positioning (PPP) [55]. However, GPS stations are not usually available and the global ocean models are not always accurate in offshore areas due to complicated coastline and seafloor relief [56].…”

Section: Seasonal Displacements and Tidal Levelsmentioning

confidence: 99%

Resolving Surface Displacements in Shenzhen of China from Time Series InSAR

Liu

Chen

et al. 2018

Remote Sensing

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Over the past few decades, the coastal city of Shenzhen has been transformed from a small fishing village to a mega city as China’s first Special Economic Zone. The rapid economic development was matched by a sharp increase in the demand for usable land and coastal reclamation has been undertaken to create new land from the sea. However, it has been reported that subsidence occurred in land reclamation area and around subway tunnel area. Subsidence and the additional threat of coastal inundation from sea-level rise highlight the necessity of displacement monitoring in Shenzhen. The time Series InSAR technique is capable of detecting sub-centimeter displacement of the Earth’s surface over large areas. This study uses Envisat, COSMO-SkyMed, and Sentinel-1 datasets to determine the surface movements in Shenzhen from 2004 to 2010 and from 2013 to 2017. Subsidence observed can be attributable to both land reclamation and subway construction. Seasonal displacements are likely to be associated with precipitation. The influence of ocean tidal level changes on seasonal displacement is not strongly evident from the results and requires further investigations. In general, InSAR has proven its ability to provide accurate measurements of ground stability for the city of Shenzhen.

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Section: Seasonal Displacements and Tidal Levelsmentioning

confidence: 99%

Resolving Surface Displacements in Shenzhen of China from Time Series InSAR

Liu

Chen

et al. 2018

Remote Sensing

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“…Lei et al (2017) claimed deformation observations were improved, but no details of the InSAR processing were given. Peng et al (2017) relied on GPS to remove a bilinear ramp but ignored tropospheric delay effects which could easily mask the OTL signal. Their interferograms also contained only small OTL signals compared with other error sources such as orbital errors which dominated.…”

Section: Introductionmentioning

confidence: 99%

Ocean Tide Loading Effects on InSAR Observations Over Wide Regions

Penna

2020

Geophysical Research Letters

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Recent and future Interferometric Synthetic Aperture Radar (InSAR) missions provide spatially wide and temporally continuous observations capturing relative ground motions over great distances which enable nationwide or continent‐wide deformation mapping. To achieve this, long wavelength errors, which increase with distance and are coupled with geophysical deformation, must be corrected. We predict the ocean tide loading (OTL) effect on Sentinel‐1 interferograms globally for all ascending and descending acquisitions, and they are largest in coastal regions. Then, interferograms over southwest Britain are investigated, with the OTL correction having a similar noise reduction effect as when correcting for tropospheric delay (27% standard deviation reduction for tropospheric delay and 46% for combined tropospheric delay and OTL). OTL corrections contribute considerably to the noise reduction of the InSAR time series, with the time series standard deviation reducing by 33% after correcting tropospheric errors and 52% after also applying OTL corrections.

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“…The OTL effect needs to be corrected in a differential InSAR interferogram due to the fact its spatial variation can reach the cm/100km scale. Previous studies have demonstrated that OTL displacements in differential InSAR interferogram are non-linear and should be removed by the use of an ocean tide models [9,10]. In recent years, researchers have established a series of ocean tide models, such as NAO99b [11], FES2014b [12], EOT11a [13], and TPXO8 [14].…”

Section: Introductionmentioning

confidence: 99%

The Extraction of Ocean Tidal Loading from ASAR Differential Interferograms

Peng

Wang

Cao

2020

Sensors

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The spatiotemporal crustal non-tectonic deformation caused by ocean tidal loading (OTL) can reach the centimeters scale in coastal land areas. The temporal variation of the site OTL displacements can be estimated by the global positioning system (GPS) technique, but its spatial variation needs to be further determined. In this paper, in order to analyze the spatial characteristics of the OTL displacements, we propose a multi-scale decomposition method based on signal spatial characteristics to derive the OTL displacements from differential interferometric synthetic aperture radar (D-InSAR) measurements. The method was tested using long-term advanced synthetic aperture radar (ASAR) data and GPS reference site data from the Los Angeles Basin in the United States, and we compared the results with the FES2014b tide model. The experimental results showed that the spatial function of the OTL displacements in an ASAR image can be represented as a higher-order polynomial function, and the spatial trends of the OTL displacements determined by the InSAR and the GPS techniques are basically consistent with the FES2014b tide model. The root-mean-square errors of the differences between the spatial OTL displacements of these two methods and the FES2014b tide model are less than 0.8 mm. The results indicate that the OTL displacement extracted from InSAR data can accurately reflect the spatial characteristics of the OTL effect, which will help to improve the spatial resolution and accuracy of the OTL displacement in coastal areas.

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Analysis of Ocean Tide Loading in Differential InSAR Measurements

Cited by 13 publications

References 19 publications

Resolving Surface Displacements in Shenzhen of China from Time Series InSAR

Resolving Surface Displacements in Shenzhen of China from Time Series InSAR

Ocean Tide Loading Effects on InSAR Observations Over Wide Regions

The Extraction of Ocean Tidal Loading from ASAR Differential Interferograms

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