3,330 research outputs found
Remote Sensing of Sea Ice from Earth Satellites
Get PDFThe application of meteorological satellite data for mapping ice fields is discussed. The characteristics of the photographic records of sea ice formations are described. The derivation of the composite minimum brightness chart by computer processing of the mapped satellite vidicon data for several successive days is explained. The factors which create a quantitative delimiting of the sea ice conditions are explained
Lysimachia thyrsiflora L.
Get PDFhttps://thekeep.eiu.edu/herbarium_specimens_byname/3719/thumbnail.jp
Quantitative Use of Satellite Vidicon Data for Delimiting Sea Ice Conditions
Get PDFAlthough television pictures from Earth satellites have been used for over ten years to detect major sea ice features, direct photo-interpretation methods have been supplemented with a fully-automated technique employing Composite Minimum Brightness (CMB) charts. Lack of on-board calibration has prevented quantitative use of the CMB method. In a newly-developed procedure the satellite brightness measurements taken over selected areas are used for external calibration. The calibrated data were used to study sea ice conditions in the North American Arctic. Characteristic brightness levels were found corresponding to the following: 1) compact or very close pack, snow covered; 2) compact or very close pack, without snow but with little or no puddling; 3) very close to close pack with much puddling; 4) open pack, generally with much puddling and rotten ice; 5) very open pack or ice-free conditions
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