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  • EARTH RESOURCES AND REMOTE SENSING  (3)
  • Lunar and Planetary Exploration  (1)
  • 1
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    Landform identification: Lunar radar images (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Three sets of polarized radar-echo images of the Moon were examined to establish the relation between radar resolution and landform-identification resolution. After comparison with lunar maps and photographs, real and apparent landforms on the radar images were grouped into one of seven classes. Results show strong relations between radar resolution and diameter or relief of landforms that are clearly identified and those that would probably be correctly identified (class 1 and class 2). Landforms are not detected (class 5) at all diameters and reliefs, but the percentage of undetected landforms decreases with increasing mean diameter and mean relief. Landforms are simply detected (class 4) at most mean diameters and reliefs. Ambiguous arrays (class 6) portrayed by the radar constitute up to about 16, 22, and 15% of the landforms at various diameters and relief values for the 3.8 cm, 70 cm high resolution, and 70 cm low resolution images, respectively. Only a few percent of the landforms portrayed by the radar images at various diameters and relief values are fictitious (class 7).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 240-242
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    High resolution radar map of the Moon (1987)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Previous radar mappings of the Moon at 70 cm wavelength in the late 1960's by Thompson have been replaced with a new set of observations using the 430 MHz radar at the Arecibo Observatory, Puerto Rico. Radar resolution was reduced to 2 to 5 km radar cell size and a beam-sweep, limb-to-limb calibration was conducted. Advances in computer technology provided the principle means of improving lunar radar mapping at this wavelength. Observation techniques and data processing are described and scattering differences found in the orthographic projection of the radar data are discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA, Washington, Reports of Planetary Geology and Geophysics Program, 1986; p 238-239
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    NASA/JPL aircraft SAR operations for 1984 and 1985 (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The NASA/JPL aircraft synthetic aperture radar (SAR) was used to conduct major data acquisition expeditions in 1983 through 1985. Substantial improvements to the aircraft SAR were incorporated in 1981 through 1984 resulting in an imaging radar that could simultaneously record all four combinations of linear horizontal and vertical polarization (HH, HV, VH, VV) using computer control of the radar logic, gain setting, and other functions. Data were recorded on high-density digital tapes and processed on a general-purpose computer to produce 10-km square images with 10-m resolution. These digital images yield both the amplitude and phase of the four polarizations. All of the digital images produced so far are archived at the JPL Radar Data Center and are accessible via the Reference Notebook System of that facility. Sites observed in 1984 and 1985 included geological targets in the western United States, as well as agricultural and forestry sites in the Midwest and along the eastern coast. This aircraft radar was destroyed in the CV-990 fire at March Air Force Base on 17 July 1985. It is being rebuilt for flights in l987 and will likely be operated in a mode similar to that described here. The data from 1984 and 1985 as well as those from future expeditions in 1987 and beyond will provide users with a valuable data base for the multifrequency, multipolarization Spaceborne Imaging Radar (SIR-C) scheduled for orbital operations in the early 1990's.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-180237 , JPL-PUB-86-20 , NAS 1.26:180237
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Integrating Radar, Multispectral, and Landing Site Data for Analysis of the Lunar Surface (1998)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Radar maps of the Moon have been produced since the late 1960s, and have been used by a number of authors to study the surface roughness, subsurface rock abundance, and dielectric properties of the lunar surface. These studies focused on a range of topics, including the depth and rock population of the regolith, crater ejecta blankets, pyroclastic mantling layers, and cryptomare deposits. Limited radar sounding data from the Apollo missions identified layering in some regions of the maria. As radar datasets have improved in resolution and calibration, it has become more possible to make quantitative comparisons between the backscatter properties of the Moon, other remote-sensing observations, and the ground truth provided by Surveyor photos and Apollo traverses. This presentation will focus on the results of recent studies of the lunar regolith that make use of these diverse sources of information, and discuss research directions that will be possible with radar data to be collected in the near future.
    Keywords: Lunar and Planetary Exploration
    Type: Workshop on New Views of the Moon: Integrated Remotely Sensed, Geophysical, and Sample Datasets; 23-24; LPI-Contrib-958
    Format: text
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    NASA TECHNICAL REPORTS
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