Matches in SemOpenAlex for { <https://semopenalex.org/work/W4387385632> ?p ?o ?g. }
Showing items 1 to 87 of
87
with 100 items per page.
- W4387385632 endingPage "1" @default.
- W4387385632 startingPage "1" @default.
- W4387385632 abstract "Remotely measuring subsurface water currents from imagery of the wave field has become a much-used technique. We study the biases and errors in such measurements due to spectral leakage, and suggest mitigating procedures. Deviations between peak values in the three-dimensional wave spectrum and the known dispersion relation in quiescent water are extracted and interpreted as current-induced Doppler shifts, from which the sub-surface current is inferred. The use of discrete Fourier transforms, however, introduces spectral leakage between nearby frequency bins. Analysing synthetically generated wave data adhering to realistic input spectra we show that although no current is in fact present, spurious currents can be “measured” which can amount to a significant fraction of the phase speed at the spectral peak. We analyse the effects of data tapering, method of Doppler shift extraction, limited wavenumber and frequency resolution, peakedness and angular width of the input spectrum, and average misalignment between waves and Doppler shift velocity direction. The narrower the input wave spectrum in frequency and/or direction, the greater the biases become. The much-used least-squares method for Doppler shift extraction performs systematically worse than a normalized scalar product method. The use of a window function reduces the severity in nearly all cases, yet mitigates the effects of limited resolution more effectively in space than in time. When a current is present the absolute biases remain essentially unchanged, when waves and currents are roughly aligned, whereas in the case of a cross-current, biases remain significant even for tapered data." @default.
- W4387385632 created "2023-10-06" @default.
- W4387385632 creator A5007336286 @default.
- W4387385632 creator A5061102578 @default.
- W4387385632 creator A5071156343 @default.
- W4387385632 date "2023-01-01" @default.
- W4387385632 modified "2023-10-16" @default.
- W4387385632 title "Biases from spectral leakage in remote sensing of near-surface currents" @default.
- W4387385632 doi "https://doi.org/10.1109/tgrs.2023.3321305" @default.
- W4387385632 hasPublicationYear "2023" @default.
- W4387385632 type Work @default.
- W4387385632 citedByCount "0" @default.
- W4387385632 crossrefType "journal-article" @default.
- W4387385632 hasAuthorship W4387385632A5007336286 @default.
- W4387385632 hasAuthorship W4387385632A5061102578 @default.
- W4387385632 hasAuthorship W4387385632A5071156343 @default.
- W4387385632 hasBestOaLocation W43873856321 @default.
- W4387385632 hasConcept C102519508 @default.
- W4387385632 hasConcept C105795698 @default.
- W4387385632 hasConcept C113407356 @default.
- W4387385632 hasConcept C11413529 @default.
- W4387385632 hasConcept C114138010 @default.
- W4387385632 hasConcept C120665830 @default.
- W4387385632 hasConcept C121130766 @default.
- W4387385632 hasConcept C121332964 @default.
- W4387385632 hasConcept C121684516 @default.
- W4387385632 hasConcept C1276947 @default.
- W4387385632 hasConcept C139719470 @default.
- W4387385632 hasConcept C142757262 @default.
- W4387385632 hasConcept C162324750 @default.
- W4387385632 hasConcept C168110828 @default.
- W4387385632 hasConcept C197424946 @default.
- W4387385632 hasConcept C2777042071 @default.
- W4387385632 hasConcept C30475298 @default.
- W4387385632 hasConcept C33923547 @default.
- W4387385632 hasConcept C41008148 @default.
- W4387385632 hasConcept C554190296 @default.
- W4387385632 hasConcept C62520636 @default.
- W4387385632 hasConcept C75172450 @default.
- W4387385632 hasConcept C76155785 @default.
- W4387385632 hasConcept C84174578 @default.
- W4387385632 hasConcept C97256817 @default.
- W4387385632 hasConceptScore W4387385632C102519508 @default.
- W4387385632 hasConceptScore W4387385632C105795698 @default.
- W4387385632 hasConceptScore W4387385632C113407356 @default.
- W4387385632 hasConceptScore W4387385632C11413529 @default.
- W4387385632 hasConceptScore W4387385632C114138010 @default.
- W4387385632 hasConceptScore W4387385632C120665830 @default.
- W4387385632 hasConceptScore W4387385632C121130766 @default.
- W4387385632 hasConceptScore W4387385632C121332964 @default.
- W4387385632 hasConceptScore W4387385632C121684516 @default.
- W4387385632 hasConceptScore W4387385632C1276947 @default.
- W4387385632 hasConceptScore W4387385632C139719470 @default.
- W4387385632 hasConceptScore W4387385632C142757262 @default.
- W4387385632 hasConceptScore W4387385632C162324750 @default.
- W4387385632 hasConceptScore W4387385632C168110828 @default.
- W4387385632 hasConceptScore W4387385632C197424946 @default.
- W4387385632 hasConceptScore W4387385632C2777042071 @default.
- W4387385632 hasConceptScore W4387385632C30475298 @default.
- W4387385632 hasConceptScore W4387385632C33923547 @default.
- W4387385632 hasConceptScore W4387385632C41008148 @default.
- W4387385632 hasConceptScore W4387385632C554190296 @default.
- W4387385632 hasConceptScore W4387385632C62520636 @default.
- W4387385632 hasConceptScore W4387385632C75172450 @default.
- W4387385632 hasConceptScore W4387385632C76155785 @default.
- W4387385632 hasConceptScore W4387385632C84174578 @default.
- W4387385632 hasConceptScore W4387385632C97256817 @default.
- W4387385632 hasFunder F4320323299 @default.
- W4387385632 hasFunder F4320334678 @default.
- W4387385632 hasLocation W43873856321 @default.
- W4387385632 hasOpenAccess W4387385632 @default.
- W4387385632 hasPrimaryLocation W43873856321 @default.
- W4387385632 hasRelatedWork W1620067444 @default.
- W4387385632 hasRelatedWork W1969771082 @default.
- W4387385632 hasRelatedWork W2011962355 @default.
- W4387385632 hasRelatedWork W2126563585 @default.
- W4387385632 hasRelatedWork W2139396389 @default.
- W4387385632 hasRelatedWork W2150690748 @default.
- W4387385632 hasRelatedWork W2181164662 @default.
- W4387385632 hasRelatedWork W2587072315 @default.
- W4387385632 hasRelatedWork W3014721535 @default.
- W4387385632 hasRelatedWork W4301358223 @default.
- W4387385632 isParatext "false" @default.
- W4387385632 isRetracted "false" @default.
- W4387385632 workType "article" @default.