Results 21 to 30 of about 285,137 (292)
Depth Limits in Body Wave Inversions [PDF]
Geophysical Journal International, 1972 Summary The Wiechert-Herglotz integral provides a direct means of calculating a seismic velocity-depth (v-d) curve from a continuous ray parameter-distance (p-Δ) curve. There is a straightforward method by which this approach can be extended to determine a velocity-depth envelope for any set of T - Δ or p - Δ data.
G. A. McMechan, R. A. Wiggins
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Hughes’s Reverspectives: Radical Uses of Linear Perspective on Non-Coplanar Surfaces
Vision, 2019 Two major uses of linear perspective are in planar paintings—the flat canvas is incongruent with the painted 3-D scene—and in forced perspectives, such as theater stages that are concave truncated pyramids, where the physical geometry and the
Thomas V. Papathomas, Patrick Hughes
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Avoiding negative depth in inverse depth bearing-only SLAM [PDF]
2008 IEEE/RSJ International Conference on Intelligent Robots and Systems, 2008 In this paper we consider ways to alleviate negative estimated depth for the inverse depth parameterisation of bearing-only SLAM. This problem, which can arise even if the beacons are far from the platform, can cause catastrophic failure of the filter.We consider three strategies to overcome this difficulty: applying inequality constraints, the use of ...
M.P. Parsley, S.J. Julier
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Inversion of the Full-Depth Temperature Profile Based on Few Depth-Fixed Temperatures
Remote Sensing, 2022 Seawater temperature plays a key role in underwater acoustics and marine fishery, etc. In oceanographic surveys, it is often desirable to detect the temperature profile and obtain its spatio-temporal variation.
Qianqian Li +5 more
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Uncertainties and shortcomings of ground surface temperature histories derived from inversion of temperature logs [PDF]
, 2005 Analysing borehole temperature data in terms of ground surface history can add useful information to reconstructions of past climates. Therefore, a rigorous assessment of uncertainties and error sources is a necessary prerequisite for the meaningful ...
Hartmann, Andreas, Rath, Volker
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Nonlinear Phase Speeds and Depth Inversions [PDF]
Coastal Dynamics 2005, 2006 Experiments were conducted in a laboratory facility under with a fixed bathymetric profile containing a single bar. A hybrid data set was collected consisting of remotely sensed wave data combined with modelgenerated wave amplitude profiles. The data is used to test the improvements in depth retrieval through the use of a nonlinear composite dispersion
Patricio Catalán, Merrick C. Haller
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Inverse Designed Metalenses with Extended Depth of Focus [PDF]
ACS Photonics, 2020 We design, fabricate and characterize a cylindrical metasurface lens operating at — 625nm with a depth of focus exceeding that of an ordinary lens using adjoint optimization-based inverse electromagnetic design.
Elyas Bayati +5 more
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Video Sensing of Nearshore Bathymetry Evolution with Error Estimate
Journal of Marine Science and Engineering, 2019 Although coastal morphology results essentially from underwater sediment transports, the evolution of underwater beach profiles along the diverse coastlines of the world is still poorly documented.
Duong Hai Thuan +3 more
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Subsonic near-surface P-velocity and low S-velocity observations using propagator inversion [PDF]
, 2005 Detailed knowledge of near-surface P- and S-wave velocities is important for processing and interpreting multicomponent land seismic data because (1) the entire wavefield passes through and is influenced by the near-surface soil conditions, (2) both ...
Curtis, A., Trampert, J., van Vossen, R.
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Underwater Topography Inversion in Liaodong Shoal Based on GRU Deep Learning Model
Remote Sensing, 2020 The Liaodong Shoal in the east of the Bohai Sea has obvious water depth variation. The clear shallow water area and deep turbid area coexist, which is characterized by complex submarine topography.
Zihao Leng +3 more
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