Abstract
Active remote sensing by radar relies dominantly on the interaction between electromagnetic waves and sea surface waves, being capillary waves for microwave radars and surface gravity waves for radars operating below about 1 GHz. High Frequency and Very High Frequency radars provide high quality mapping of surface currents and some systems map wave heights on grid scales 50 m to 20 km. Scatterometers are microwave radar systems that map surface winds and sea roughness on large scales of 1,000 km2. Synthetic aperture radar makes observations at very fine resolution scales of a few meters, and is used to measure wave height and detect changes in surface roughness. Radar remote sensing from satellites, aircraft and shore platforms is a rapidly developing field that has the capacity to carry out monitoring observations on scales from reef lagoons to regional and global oceans.
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Acknowledgments
Data were drawn from the Australian Integrated Marine Observing System (IMOS) archive for some of the HF radar images. RADARSAT-1 SAR imagery was processed by the Alaska Satellite Facility of the University of Alaska, Fairbanks. ENVISAT imagery was processed by the European Space Agency. The authors wish to thank Frank Monaldo of The Johns Hopkins University Applied Physics Laboratory, Xiaofeng Li of GST at NOAA/NESDIS, and Christopher Jackson of Global Ocean Associates for SAR product development and processing of the figures shown and products discussed. The views, opinions, and findings contained in this paper are those of the authors and should not be construed as an official NOAA or U.S. Government position, policy, or decision.
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Heron, M.L., Pichel, W.G., Heron, S.F. (2013). Radar Applications. In: Goodman, J., Purkis, S., Phinn, S. (eds) Coral Reef Remote Sensing. Springer, Dordrecht. https://doi.org/10.1007/978-90-481-9292-2_13
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