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  • 1
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    An approach for the geometric rectification of radar imagery (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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  • 2
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    Evaluation of the L-band scattering characteristics of volcanic terrain in aid of lithologic identification, assessment of SIR-B calibration, and development of planetary geomorphic analogs (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The objectives of the Shuttle Imaging Radar-B (SIR-B) scattering study and calibration investigation of volcanic terrain are to delineate textural and structural features, to evaluate the L-band scattering characteristics, and to assess SIR-B calibration. Specific tasks are outlined and expected results are summarized.
    Keywords: GEOPHYSICS
    Type: JPL The SIR-B Sci. Invest. Plan; 3 p
    Format: text
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  • 3
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    Image synthesis for SAR system, calibration and processor design (1978)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The Point Scattering Method of simulating radar imagery rigorously models all aspects of the imaging radar phenomena. Its computational algorithms operate on a symbolic representation of the terrain test site to calculate such parameters as range, angle of incidence, resolution cell size, etc. Empirical backscatter data and elevation data are utilized to model the terrain. Additionally, the important geometrical/propagation effects such as shadow, foreshortening, layover, and local angle of incidence are rigorously treated. Applications of radar image simulation to a proposed calibrated SAR system are highlighted: soil moisture detection and vegetation discrimination.
    Keywords: COMMUNICATIONS AND RADAR
    Type: New Mexico State Univ. Proc. of the 1978 Syn. Aperture Radar Technol. Conf.; 10 p
    Format: application/pdf
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  • 4
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    Preliminary geologic analyses of SIR-B radar data for Hawaii (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A number of distinct topographic and textural units were discerned on SIR-B radar images of the Kilauea/Kau Desert area. The SIR-B enhanced large-scale topographic features, such as the Kahuku Pali and the Koae Faults (both oriented towards the radar antenna), while it was unable to detect features facing away from the radar antenna such as the Hilina and Kaoiki Pali. Textural units which were identified on the SIR-B images include aa flows of various ages, and several pyroclastic units. The extreme surface roughness of aa flows produced high radar returns on both the 28 deg and 48 deg SIR-B data sets. In contrast, pahoehoe flows produced smooth, low return units which were difficult to distinguish from surrounding radar-dark materials. It is suggested that multilook direction data, acquired at steeper incidence angles during a reflight of SIR-B, may aid in the further identification of pahoehoe flows and subtle topographic features.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Format: text
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  • 5
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    A methodology for determining optimum microwave remote sensor parameters (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E80-10124 , NASA-CR-160564 , RSL-TR-380-1
    Format: application/pdf
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  • 6
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    A study of image quality for radar image processing (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Methods developed for image quality metrics are reviewed with focus on basic interpretation or recognition elements including: tone or color; shape; pattern; size; shadow; texture; site; association or context; and resolution. Seven metrics are believed to show promise as a way of characterizing the quality of an image: (1) the dynamic range of intensities in the displayed image; (2) the system signal-to-noise ratio; (3) the system spatial bandwidth or bandpass; (4) the system resolution or acutance; (5) the normalized-mean-square-error as a measure of geometric fidelity; (6) the perceptual mean square error; and (7) the radar threshold quality factor. Selective levels of degradation are being applied to simulated synthetic radar images to test the validity of these metrics.
    Keywords: COMMUNICATIONS AND RADAR
    Type: NASA-CR-169907 , NAS 1.26:169907 , ARSL-TR-82-1
    Format: application/pdf
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  • 7
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    Simulation of spaceborne stereo radar imagery - Experimental results (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Computer simulation of radar imagery was used to investigate spaceborne stereo radar. The major conclusions reached are that stereo pairs representing different angles of incidence with the same look-direction appear best and that the angles of incidence and stereo intersection angle be matched to the slope and relief of terrain. A parametric tradeoff analysis was performed for eleven different angles of incidence over three different model areas. The eleven angles spanned the range from small- to large-incidence angles. The three model areas were selected as typical of relatively flat, moderately rough, and mountainous terrain. The stereo pair judged best for each model area are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: (ISSN 0196-2892)
    Format: text
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  • 8
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    SAR image enhancement via post-correlation signal processing (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Seventeen interpreters ranked sets of computer-generated radar imagery to assess the value of post-correlation processing on the interpretability of SAR (synthetic aperture radar) imagery. The post-correlation processing evaluated amounts to a nonlinear mapping of the signal exiting a digital correlator and allows full use of signal bandwidth for improving the spatial resolution or for noise reduction. The results indicate that it is reasonable to hypothesize an optimal SAR presentation format for specific applications even though this study was too limited to be specific.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-22; 582-585
    Format: text
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  • 9
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    Model for optimal parallax in stereo radar imagery (1984)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Simulated stereo radar imagery is used to investigate parameters for a spaceborne imaging radar. Incidence angles ranging from small to intermediate to large are used with three digital terrain model areas which are representative of relatively flat, moderately rough, and mountaneous terrain. The simulated radar imagery was evaluated by interpreters for ease of stereo perception and information content, and rank ordered within each class of terrain. The interpreter's results are analyzed for trends between the height of a feature and either parallax or vertical exaggeration for a stereo pair. A model is developed which predicts the amount of parallax (or vertical exaggeration) an interpreter would desire for best stereo perception of a feature of a specific height. Results indicate the selection of angle of incidence and stereo intersection angle depend upon the relief of the terrain. Examples of the simulated stereo imagery are presented for a candidate spaceborne imaging radar having four selectable angles of incidence.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: IEEE Transactions on Geoscience and Remote Sensing (ISSN 0196-2892); GE-22; 564-569
    Format: text
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  • 10
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    Optimization of radar imaging system parameters for geological analysis (1981)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of radar image simulation to model terrain variation and determine optimum sensor parameters for geological analysis is described. Optimum incidence angle is determined by the simulation, which evaluates separately the discrimination of surface features possible due to terrain geometry and that due to terrain scattering. Depending on the relative relief, slope, and scattering cross section, optimum incidence angle may vary from 20 to 80 degrees. Large incident angle imagery (more than 60 deg) is best for the widest range of geological applications, but in many cases these large angles cannot be achieved by satellite systems. Low relief regions require low incidence angles (less than 30 deg), so a satellite system serving a broad range of applications should have at least two selectable angles of incidence.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: American Society of Photogrammetry and American Congress on Surveying and Mapping, Fall Technical Meeting; Sep 09, 1981 - Sep 11, 1981; San Francisco, CA
    Format: text
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