Direct Surface Current Field Imaging from Space by Along-Track InSAR and Conventional SAR

Romeiser, Roland; Johannessen, Johnny A.; Chapron, Bertrand; Collard, Fabrice; Kudryavtsev, V. N.; Runge, Hartmut; Suchandt, Steffen

doi:10.1007/978-90-481-8681-5_5

Cited by 30 publications

(23 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Doppler estimation must be performed within a window, thus at a final spatial resolution much lower than the resolution of a fully processed SAR image, but the quality of DCA results has been found to be comparable to the quality of divided-antenna mode ATI results from TerraSAR-X. A qualitative comparison of both techniques was presented in [25].…”

Section: Comparison With Circulation Model Resultsmentioning

confidence: 99%

Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis

Romeiser

Runge

Suchandt

et al. 2014

IEEE Trans. Geosci. Remote Sensing

Self Cite

View full text Add to dashboard Cite

All existing examples of current measurements by spaceborne synthetic aperture radar (SAR) along-track interferometry (ATI) have suffered from short baselines and corresponding low sensitivities. Theoretically, the best data quality at X band is expected at effective baselines on the order of 30 m, i.e. 30 times as long as the baselines of the divided-antenna modes of TerraSAR-X. In early 2012, we had a first opportunity to obtain data at near-optimum baselines from the TanDEM-X satellite formation. In this paper we analyze two TanDEM good agreement in all three cases. The DCA-based currents are found to be less accurate than the ATIbased ones, but close to short-baseline ATI results in quality. We conclude that DCA is a considerable alternative to divided-antenna mode ATI, while our TanDEM-X results demonstrate the true potential of the ATI technique at near-optimum baselines.

show abstract

Section: Comparison With Circulation Model Resultsmentioning

confidence: 99%

Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis

Romeiser

Runge

Suchandt

et al. 2014

IEEE Trans. Geosci. Remote Sensing

Self Cite

View full text Add to dashboard Cite

show abstract

“…As a result, the next challenge is to investigate whether these BLRinduced oceanic responses can be observed directly. Several techniques described in the recent literature (Romeiser et al [2010] ; Matthews and Yoshikawa [2012] (which is a recent paper using very high-resolution HF radar)) hold promise in this regard. However, any attempt to resolve this important issue will require careful event selection, most likely from within a region of little or no tidal flow.…”

Section: Discussionmentioning

confidence: 99%

Atmospheric boundary layer rolls: Quantification of their effect on the hydrodynamics in the German Bight

Müller

Stanev

Schulz‐Stellenfleth

et al. 2013

J. Geophys. Res. Oceans

View full text Add to dashboard Cite

[1] Atmospheric boundary layer rolls and their impact on upper ocean circulation were investigated using a combination of two high-resolution data sources: (1) data from the Advanced Synthetic Aperture Radar (ASAR) onboard ENVISAT with a spatial sampling of approximately 500 m Â 500 m and (2) continuous observations taken at the research platform FINO 1 with 2 min temporal sampling at eight heights between 33 and 100 m. The parallel analysis of instantaneous image data in combination with the FINO 1 time series enabled us to quantify both the spatial and temporal dynamics of mesoscale and submesoscale wind variations. The influence of these variations with different temporal and spatial scales on the hydrodynamics of the German Bight was addressed using outputs from a three-dimensional circulation model. It was demonstrated that while the coupling between wind and tidal forcing triggered substantial responses at mesoscales, the response of surface currents and sea surface temperature to the atmospheric boundary layer rolls appeared relatively weak. However, these ocean surface responses closely follow the surface footprint of the atmospheric boundary layer rolls, the signatures of which become more pronounced in the absence of strong tidal flows.

show abstract

“…Several techniques, such as those based on active Synthetic Aperture Radar (SAR) [ Goldstein and Zebker , 1987; Goldstein et al , 1994; Graber et al , 1996; Chapron et al , 2005; Liu and Hsu , 2009; Romeiser et al , 2010] or on inter‐image feature tracking within passive image pairs [ Steissberg et al , 2005; Turiel et al , 2008; Matthews and Emery , 2009; Kääb and Prowse , 2011] have the potential to deliver high resolution current measurements from space. However, these approaches will require rigorous and repeated validation of the type that is normally demanded of in situ and ground‐based oceanographic instrumentation before they become widely accepted within the marine science community.…”

Section: Introductionmentioning

confidence: 99%

Synergistic surface current mapping by spaceborne stereo imaging and coastal HF radar

Matthews

Yoshikawa

2012

Geophysical Research Letters

View full text Add to dashboard Cite

[1] Well validated optical and radar methods of surface current measurement at high spatial resolution (nominally <100 m) from space can greatly advance our ability to monitor earth's oceans, coastal zones, lakes and rivers. With interest growing in optical along-track stereo techniques for surface current and wave motion determinations, questions of how to interpret such data and how to relate them to measurements made by better validated techniques arise. Here we make the first systematic appraisal of surface currents derived from along-track stereo Sun glitter (ATSSG) imagery through comparisons with simultaneous synoptic flows observed by coastal HF radars working at frequencies of 13.9 and 24.5 MHz, which return averaged currents within surface layers of roughly 1 m and 2 m depth respectively. At our Tsushima Strait (Japan) test site, we found that these two techniques provided largely compatible surface current patterns, with the main difference apparent in current strength. Within the northwest (southern) comparison region, the magnitudes of the ATSSG current vectors derived for 13 August 2006 were on average 22% (40%) higher than the corresponding vectors for the 1-m (2-m) depth radar. These results reflect near-surface vertical current structure, differences in the flow components sensed by the two techniques and disparities in instrumental performance. The vertical profile constructed here from ATSSG, HF radar and ADCP data is the first to resolve downwind drift in the upper 2 m of the open ocean. The profile e-folding depth suggests Stokes drift from waves of 10-m wavelength visible in the images. Citation: Matthews, J. P., and Y. Yoshikawa (2012), Synergistic surface current mapping by spaceborne stereo imaging and coastal HF radar, Geophys.

show abstract

Direct Surface Current Field Imaging from Space by Along-Track InSAR and Conventional SAR

Cited by 30 publications

References 29 publications

Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis

Quality Assessment of Surface Current Fields From TerraSAR-X and TanDEM-X Along-Track Interferometry and Doppler Centroid Analysis

Atmospheric boundary layer rolls: Quantification of their effect on the hydrodynamics in the German Bight

Synergistic surface current mapping by spaceborne stereo imaging and coastal HF radar

Contact Info

Product

Resources

About