Radar Scatterometer Discrimination of Sea-Ice Types

Parashar, S. K.; Haralick, Robert M.; Moore, R. K.; Biggs, Albert W.

doi:10.1109/tge.1977.294480

Cited by 10 publications

(2 citation statements)

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“…Other frequencies have been suggested in the past, such as X-band (Parashar and others, 1977; Onstott and others, 1979 and 1982; Kim and others, 1984), for better discrimination between FY and MY ice. They have not been considered in this paper because they were not available, and because L- and C-band are the only two frequencies available from space over the polar regions for a number of years to come, and we need to establish clearly the level of performance of these different SAR systems for ice mapping.…”

Section: Discussionmentioning

confidence: 99%

“…P-band is similar to L-band with a reduced contrast between MY and FY. P-band is not considered as particularly useful for ice mapping (Parashar and others, 1977), but the classification results are reported here for sake of completeness. The classification accuracy is 60% at HH-polarization, 70% at HH- and W-polarizations combined Table 4i, and only 58% with the full polarimetry Table 4j.…”

Section: Classification Accuracy Vs Frequency and Polarizationmentioning

confidence: 99%

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Winter Sea-ice mapping from multi-parameter synthetic-aperture radar data

Rignot¹,

Drinkwater²

1994

J. Glaciol.

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ABSTRACT. The limitations of current and immediate future single-frequency, single-polarization, space-borne SARs for winter sea-ice mapping are quantitatively examined, and improvements are suggested by combining frequencies and polarizations. Ice-type maps are generated using multi-channel, air-borne SAR observations of winter sea ice in the Beaufort Sea to identify six ice conditions: (1) multi-year sea ice; (2) compressed first-year ice; (3) first-year rubble and ridges; (4) first-year rough ice; (5) first-year smooth ice; and (6) first-year thin ice. At a single polarization, C-(,X = 5.6 cm) and L-(,X = 24 cm) band frequencies yield a classification accuracy of 67 and 71 %, because C-band confuses multi-year ice and compressed, rough, thick first-year ice surrounding multi-year ice floes, and L-band confuses multi-year ice and deformed first-year ice. Combining C-and L-band improves classification accuracy by 20%. Adding a second polarization at one frequency only improves classification accuracy by 10-14% and separates thin ice and calm open water. Under similar winter-ice conditions, ERS-l (C vv ) and Radarsat (CmI) would overestimate the multi-year ice fraction by 15% but correctly map the spatial variability of ice thickness; J-ERS-l (LHH) would perform poorly; andJ-ERS-l combined with ERS-l or Radarsat would yield reliable estimates of the old, thick, first-year and thin-ice fractions, and of the spatial distribution of ridges. With two polarizations, future single-frequency space-borne SARs could improve our current capability to discriminate thinner ice types.

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