Geodetically Accurate InSAR Data Processor

Zebker, H. A.; Hensley, Scott; Shanker, Piyush; Wortham, Christopher

doi:10.1109/tgrs.2010.2051333

Cited by 62 publications

(41 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Coherence loss results from temporal changes in surface scattering characteristics, changes in viewing geometry, and noise in the SAR data. Temporal coherence loss increases with the time span between the two SAR scenes, although coherence typically persists for individual seasons and even for several years in tundra regions for C-band and L-band SAR data [19,32,33]. We found generally good coherence in the interferograms with values greater than 0.5, which is consistent with our assumption that spurious effects such as radio frequency interference (RFI) and ionospheric Faraday rotation do not hinder the estimation of seasonal subsidence.…”

Section: Insar Techniquessupporting

confidence: 84%

“…All four of these anomalies occur in DTLBs, but we have not yet identified a common mechanism that can explain them. At SAC Basin, the spatial anomaly occurred in a slightly raised area of the DTLB away from the residual pond, indicating InSAR detected a seasonal variation in excess ground ice [32]. At Big Spot DTLB, the spatial anomaly occurs over standing water, hinting that the ReSALT retrieval algorithm may be detecting seasonal variations in water level.…”

Section: Overestimation Of Alt In Dtlbsmentioning

confidence: 96%

“…We then used multilook processing area averaging to increase coherence and reduce uncertainty, resulting in a final resolution of ~30 m. The resulting interferograms are georeferenced using satellite orbit data and a digital elevation model. Zebker et al, [32] describe the processing procedures in detail.…”

Section: Insar Techniquesmentioning

confidence: 99%

See 2 more Smart Citations

Remotely Sensed Active Layer Thickness (ReSALT) at Barrow, Alaska Using Interferometric Synthetic Aperture Radar

et al. 2015

View full text Add to dashboard Cite

Active layer thickness (ALT) is a critical parameter for monitoring the status of permafrost that is typically measured at specific locations using probing, in situ temperature sensors, or other ground-based observations. Here we evaluated the Remotely Sensed Active Layer Thickness (ReSALT) product that uses the Interferometric Synthetic Aperture Radar technique to measure seasonal surface subsidence and infer ALT around Barrow, Alaska. We compared ReSALT with ground-based ALT obtained using probing and calibrated, 500 MHz Ground Penetrating Radar at multiple sites around Barrow. ReSALT accurately reproduced observed ALT within uncertainty of the GPR and probing data OPEN ACCESS Remote Sens. 2015, 7 3736 in ~76% of the study area. However, ReSALT was less than observed ALT in ~22% of the study area with well-drained soils and in ~1% of the area where soils contained gravel. ReSALT was greater than observed ALT in some drained thermokarst lake basins representing ~1% of the area. These results indicate remote sensing techniques based on InSAR could be an effective way to measure and monitor ALT over large areas on the Arctic coastal plain.

show abstract

Section: Insar Techniquessupporting

confidence: 84%

Section: Overestimation Of Alt In Dtlbsmentioning

confidence: 96%

See 1 more Smart Citation

Remotely Sensed Active Layer Thickness (ReSALT) at Barrow, Alaska Using Interferometric Synthetic Aperture Radar

et al. 2015

View full text Add to dashboard Cite

show abstract

“…A total of 39 images covering the two tiles were analyzed. Interferograms were formed using a geodetically accurate, motioncompensating InSAR processor (36). Elevation correction, negligible in this nearly flat landscape, was made using the SRTM 90-m DEM.…”

Section: Methodsmentioning

confidence: 99%

Release of arsenic to deep groundwater in the Mekong Delta, Vietnam, linked to pumping-induced land subsidence

Erban¹,

Gorelick²,

Zebker

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

236

126

View full text Add to dashboard Cite

Deep aquifers in South and Southeast Asia are increasingly exploited as presumed sources of pathogen- and arsenic-free water, although little is known of the processes that may compromise their long-term viability. We analyze a large area (>1,000 km 2 ) of the Mekong Delta, Vietnam, in which arsenic is found pervasively in deep, Pliocene–Miocene-age aquifers, where nearly 900 wells at depths of 200–500 m are contaminated. There, intensive groundwater extraction is causing land subsidence of up to 3 cm/y as measured using satellite-based radar images from 2007 to 2010 and consistent with transient 3D aquifer simulations showing similar subsidence rates and total subsidence of up to 27 cm since 1988. We propose a previously unrecognized mechanism in which deep groundwater extraction is causing interbedded clays to compact and expel water containing dissolved arsenic or arsenic-mobilizing solutes (e.g., dissolved organic carbon and competing ions) to deep aquifers over decades. The implication for the broader Mekong Delta region, and potentially others like it across Asia, is that deep, untreated groundwater will not necessarily remain a safe source of drinking water.

show abstract

“…S1). The CSK interferograms were processed using the InSAR Scientific Computing Environment (ISCE) interferometric processing system (Zebker et al, 2010) by the Advanced Rapid Imaging and Analysis (ARIA) team at JPL-Caltech, in collaboration with the ASI and University of Basilicata. The interferogram was unwrapped using SNAPHU (Chen and Zebker, 2001) and masked using a signal coherence threshold.…”

Section: Observationsmentioning

confidence: 99%