Improved detection of the first-order region for direction-finding HF radars using image processing techniques
Kirincich, Anthony R.
MetadataShow full item record
KeywordOcean circulation; Waves, oceanic; Data processing; Radars/Radar observations; Remote sensing; Pattern detection
For direction-finding high-frequency (HF) radar systems, the correct separation of backscattered spectral energy due to Bragg resonant waves from that due to more complex double-scattering represents a critical first step toward attaining accurate estimates of surface currents from the range-dependent radar backscatter. Existing methods to identify this “first order” region of the spectra, generally sufficient for lower-frequency radars and low-velocity or low-surface gravity wave conditions, are more likely to fail in higher-frequency systems or locations with more variable current, wave, or noise regimes, leading to elevated velocity errors. An alternative methodology is presented that uses a single and globally relevant smoothing length scale, careful pretreatment of the spectra, and marker-controlled watershed segmentation, an image processing technique, to separate areas of spectral energy due to surface currents from areas of spectral energy due to more complex scattering by the wave field or background noise present. Applied to a number of HF radar datasets with a range of operating frequencies and characteristic issues, the new methodology attains a higher percentage of successful first-order identification, particularly during complex current and wave conditions. As operational radar systems continue to expand to more systematically cover areas of high marine traffic, close approaches to ports and harbors, or offshore energy installations, use of this type of updated methodology will become increasingly important to attain accurate current estimates that serve both research and operational interests.
Author Posting. © American Meteorological Society, 2017. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Atmospheric and Oceanic Technology 34 (2017): 1679-1691, doi:10.1175/JTECH-D-16-0162.1.
Suggested CitationJournal of Atmospheric and Oceanic Technology 34 (2017): 1679-1691
Showing items related by title, author, creator and subject.
SEASTAR: A mission to study ocean submesoscale dynamics and small-scale atmosphere-ocean processes in coastal, shelf and polar seas Gommenginger, Christine; Chapron, Bertrand; Hogg, Andy; Buckingham, Christian; Fox-Kemper, Baylor; Eriksson, Leif; Soulat, Francois; Ubelmann, Clement; Ocampo-Torres, Francisco; Nardelli, Bruno Buongiorno; Griffin, David; Lopez-Dekker, Paco; Knudsen, Per; Andersen, Ole; Stenseng, Lars; Stapleton, Neil; Perrie, Will; Violante-Carvalho, Nelson; Schulz-Stellenfleth, Johannes; Woolf, David K.; Isern-Fontanet, Jordi; Ardhuin, Fabrice; Klein, Patrice; Mouche, Alexis; Pascual, Ananda; Capet, Xavier; Hauser, Daniele; Stoffelen, Ad; Morrow, Rosemary; Aouf, Lotfi; Breivik, Øyvind; Fu, Lee-Lueng; Johannessen, Johnny A.; Aksenov, Yevgeny; Bricheno, Lucy; Hirschi, Joel; Martin, Adrien C. H.; Martin, Adrian P.; Nurser, A. J. George; Polton, Jeff; Wolf, Judith; Johnsen, Harald; Soloviev, Alexander; Jacobs, Gregg A.; Collard, Fabrice; Groom, Steve; Kudryavtsev, Vladimir; Wilkin, John L.; Navarro, Victor; Babanin, Alexander; Martin, Matthew; Siddorn, John; Saulter, Andrew; Rippeth, Tom; Emery, Bill; Maximenko, Nikolai; Romeiser, Roland; Graber, Hans C.; Alvera Azcarate, Aida; Hughes, Chris W.; Vandemark, Douglas; da Silva, Jose; Van Leeuwen, Peter Jan; Naveira Garabato, Alberto C.; Gemmrich, Johannes; Mahadevan, Amala; Marquez, Jose; Munro, Yvonne; Doody, Sam; Burbidge, Geoff (Frontiers Media, 2019-08-13)High-resolution satellite images of ocean color and sea surface temperature reveal an abundance of ocean fronts, vortices and filaments at scales below 10 km but measurements of ocean surface dynamics at these scales are ...
Rypina, Irina I.; Kirincich, Anthony R.; Lentz, Steven J.; Sundermeyer, Miles A. (American Meteorological Society, 2016-06-29)This paper aims to test the validity, utility, and limitations of the lateral eddy diffusivity concept in a coastal environment through analyzing data from coupled drifter and dye releases within the footprint of a ...
Remote sensing of the surface wind field over the coastal ocean via direct calibration of HF radar backscatter power Kirincich, Anthony R. (American Meteorological Society, 2016-06-24)The calibration and validation of a novel approach to remotely sense surface winds using land-based high-frequency (HF) radar systems are described. Potentially available on time scales of tens of minutes and spatial scales ...