Detection of seamount signatures in SEASAT altimeter data using matched filters

White, James V.; Sailor, R. V.; Lazarewicz, A. R.; Leschack, A. R.

doi:10.1029/jc088ic03p01541

Cited by 41 publications

(15 citation statements)

References 10 publications

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“…Re-sampling of data to n evenly spaced points along the profile and a detection threshold were also necessary. Detection capability for seamounts as small as 1 km [White et al, 1983] with 'detection effective across a wide range of [shape] parameters' [Lazarewicz and Schwank, 1982] was claimed. Craig & Sandwell [1988], however, found identification of signals corresponding to seamounts by-eye more reliable.…”

Section: Direct Detectionmentioning

confidence: 99%

“…Since 'moderate variations in seamount shape do not affect the [geoid] signature significantly' [White et al, 1983] the shape required for pattern-matching techniques is less critical than for bathymetry, and so direct detection routines in altimetry data have exploited this approach. Lazarewicz & Schwank [1982] used a 'matched filter' algorithm of White et al [1983] to detect the location of seamounts in SEASAT altimeter profiles.…”

Section: Direct Detectionmentioning

confidence: 99%

“…Craig & Sandwell [1988], however, found identification of signals corresponding to seamounts by-eye more reliable. Furthermore, whilst White et al [1983] note that their pattern matching technique could be done with a range of scales, this was never implemented. Wessel and Lyons [1997] next attempted an algorithm for seamount detection in altimeter data, but this time for gridded vertical gravity gradients (VGG).…”

Section: Direct Detectionmentioning

confidence: 99%

“…Lazarewicz & Schwank [1982] used a 'matched filter' algorithm of White et al [1983] to detect the location of seamounts in SEASAT altimeter profiles. In essence, seamounts of a single width were sought out across a profile as events statistically distinct from the measurement noise in the profile, but to permit calculation in the frequency domain several approximations (e.g.…”

Section: Direct Detectionmentioning

confidence: 99%

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Seamount detection and isolation with a modified wavelet transform

Hillier

2008

Basin Research

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The size, shape and number of seamounts, once detected and isolated from other features such as oceanic plateaus or trenches, have the potential to provide valuable constraints on important solid Earth processes, e.g. oceanic volcanism. The variability of seamount size and morphology, however, presents problems for computational approaches to seamount isolation. This paper develops a novel and efficient wavelet-based seamount detection routine 'SWT'; the first use of multiple scales of analysis to directly isolate edifices from bathymetric data. Only weak shaperelated criteria are used and no a priori knowledge of the scale and location of the seamounts is required. For a bathymetric profile collected on cruise v3312 SWT matches, to within 25%, the dimensions of five times the number of the features determined by manual inspection than does the best statistically-based (e.g. mean, median or mode) sliding window filter. The size-frequency distribution, a key descriptor of seamount populations, is also much better estimated by the SWT method. As such, the SWT represents a step towards the goal of objective and robust quantification and classification of seamounts.

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Section: Direct Detectionmentioning

confidence: 99%

Section: Direct Detectionmentioning

confidence: 99%

Section: Direct Detectionmentioning

confidence: 99%

Section: Direct Detectionmentioning

confidence: 99%

See 2 more Smart Citations

Seamount detection and isolation with a modified wavelet transform

Hillier

2008

Basin Research

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“…The continental crust is thicker and lighter than the oceanic crust (White et al 1983). This can be seen from the gravity anomaly.…”

Section: Geodynamical Analysis In Deep Earthmentioning

confidence: 99%

Gravity Anomaly and Satellite Altimetry in the China Seas: Applications to Geodynamics

Chang¹,

Zhang²,

Wen³

et al. 2008

Terr. Atmos. Ocean. Sci.

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Satellite altimetry has become an operational remote sensing technique with important applications to geodynamics. In the present paper, ocean floor topography and tectonic detection in the deep earth are investigated using gravity anomalies from global gravity models and satellite altimetry corrected for waveform distortions. We compute the spherical harmonic degree components of the gravity anomaly from gravity models (up to degree 360), and use inverse the Vening Meinesz formula in the remove-restore procedure to obtain the residual gravity anomaly components higher than degree 360. This paper is intended to give a geodynamical analysis on the gravity anomaly components from the crust, upper mantle, and lower mantle. On this base, the geodynamics background and mechanism in an area of the China Seas (25°N ~ 42°N, 118°E ~ 130°E) are studied. The evidence shows gravity anomaly of different degree in the study area is mainly due to mass distribution of different depth, and the dynamical imbalance from the geopotential imbalance should be responsible for global dynamics activities, which change the lithosphere structure through mantle circulation.

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Satellite Altimetry: Principles and Applications in Earth Sciences

Frappart

Blumstein

Cazenave

et al. 2017

Wiley Encyclopedia of Electrical and Electronics Engineering

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Satellite altimetry is a radar technique measuring the topography of the Earth surface. It was initially designed for the measuring of the topography of the sea surface with reference to an ellipsoid and for the determination of the marine geoid. It also provided valuable information on the ocean circulation. With the improvement of the orbit accuracy from the meter to the centimeter level, satellite altimetry has become a key measurement to estimate sea level variations from regional to global scales. Satellite altimetry is mostly used over the ocean to measure the surface geostrophic currents, eddy structures, wave heights, and the propagation of oceanic Kelvin and Rossby waves. Altimetry has also demonstrated a strong potential for ice and hydrology studies and is now commonly used for the monitoring of the Arctic and Antarctic ice sheets topography and of terrestrial surface water levels.

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Detection of seamount signatures in SEASAT altimeter data using matched filters

Cited by 41 publications

References 10 publications

Seamount detection and isolation with a modified wavelet transform

Seamount detection and isolation with a modified wavelet transform

Gravity Anomaly and Satellite Altimetry in the China Seas: Applications to Geodynamics

Satellite Altimetry: Principles and Applications in Earth Sciences

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