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  • INSTRUMENTATION AND PHOTOGRAPHY  (2)
  • OCEANOGRAPHY  (1)
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  • 1
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    Mapping of sea ice and measurement of its drift using aircraft synthetic aperture radar images (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Side-looking radar images of Arctic sea ice were obtained as part of the Arctic Ice Dynamics Joint Experiment. Repetitive coverages of a test site in the Arctic were used to measure sea ice drift, employing single images and blocks of overlapping radar image strips; the images were used in conjunction with data from the aircraft inertial navigation and altimeter. Also, independently measured, accurate positions of a number of ground control points were available. Initial tests of the method were carried out with repeated coverages of a land area on the Alaska coast (Prudhoe). Absolute accuracies achieved were essentially limited by the accuracy of the inertial navigation data. Errors of drift measurements were found to be about + or - 2.5 km. Relative accuracy is higher; its limits are set by the radar image geometry and the definition of identical features in sequential images. The drift of adjacent ice features with respect to one another could be determined with errors of less than + or - 0.2 km.
    Keywords: OCEANOGRAPHY
    Type: Journal of Geophysical Research; 84; Apr. 20
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Tradeoffs among several synthetic aperture radar image quality parameters - Results of a user survey study (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The imagery obtained with the aid of synthetic aperture radars (SAR) has been applied to several remote sensing disciplines such as geologic feature mapping, oceanic phenomena studies, and land use and urban morphology studies. The successful SAR experiment on Seasat and the Shuttle demonstrated the feasibility of global radar mapping at relatively high resolution from a spaceborn platform. The present investigation is concerned with the requirements of and the tradeoffs among several SAR image quality parameters. The results are presented from a survey study concerning the interpretability of a set of SAR images. The data used to generate these images were obtained by the Seasat SAR experiments. Attention is given to image scenes and the simulation experiment, image interpretation survey results, multiple-looks, the number of looks vs resolution, and number of bits vs resolution.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112); 49; June 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Application of dielectric constant measurements to radar imagery interpretation (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A ground-truth scheme is briefly outlined, specifically, the measurement of the dielectric constant. Two portable instruments were designed specifically for this purpose: a Q-meter for measurement of dielectric constant and loss tangent, and an instrument to measure electrical properties of the two operating frequencies of the imaging radar. Several general cases of radar-earth surfaces interaction are described; also, examples of radar imagery and some data on ice and snow are presented.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Conference on Earth Resources Observation and Information Analysis Systems; Mar 26, 1973 - Mar 28, 1973; Tullahoma, TN
    Format: text
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    NASA TECHNICAL REPORTS
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