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  • 1
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    Analysis of Radar Images of Angkor, Cambodia (2000)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: During the 1996 AIRSAR Pacific Rim Deployment, data were collected over Angkor in Cambodia. The temples of Angkor date the succession of cities to the 9th-13th century AD, but little is known of its prehistoric habitation. A related area of archaeological debate has been the origin, spiritual meaning and use of the hydraulic constructions in the urban zone. The high resolution, multi-channel capability of AIRSAR, together with the unprecedentedly accurate topography provided by TOPSAR, offer identification and delineation of these features. Examples include previously unrecorded circular earthworks around circular village sites, detection of unrecorded earthwork dykes, reservoirs and canal features, and of temple sites located some distance from the main temple complex at Angkor.
    Keywords: Earth Resources and Remote Sensing
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The Role of Imaging Radar in Forest Management (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The use of synthetic aperture radar (SAR) data from the SIR-C/X- SAR was demonstrated for mapping various land cover and vegetation properties.
    Keywords: Earth Resources and Remote Sensing
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  • 3
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    Development of SIR-C Ground Calibration Equipment (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: SIR-C/X-SAR is currently scheduled for launch in April 1994. SIR-C is an L-Band and C-Band, multi-polarization spaceborne SAR system developed by NASA/JPL. X- SAR is an X-Band SAR system developed by DARA/ASI. One of the problems involved in calibrating the SIR-C instrument is to make sure that the horizontal (H) and vertical (V) polarized beams are aligned in the azimuth direction, i.e.. that they are pointing in the same direction. This is important if the polarimetric performance specifications for the system are to be met. To solve this problem, we have designed and built a prototype of a low-cost ground receiver capable of recording received power from two antennas, one H-polarized, the other V-polarized. The two signals are mixed to audio then recorded on the left and right stereo channels of a standard audio cassette player. The audio cassette recording can then be played back directly into a Macintosh computer, where it is digitized. Analysis of.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience and Remote Sensing; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The Effects of Noise on Polarimetric SAR Data (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Polarimetric SAR data can provide a great deal of information about the scattering behavior of the surface under observation. Polarimetric SAR systems often measure the scattering matrices of the areas under observation in linear polarizations (H and V). From the scattering matrix commonly used forms such as the covariance matrix and the Stokes matrix can be easily derived. Other measures derived from polarimetric SAR data include the standard deviation of texture, correlation coefficients between scattering matrix terms, and the mode and variance of phase differences between scattering matrix terms. The effects of additive system noise on these measurements is not often considered in the literature on this subject.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Calibration Results for J-ERS-1 SAR Data Produced by the Alaska SAR Facility (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Alaska SAR Facility has been receiving and processing SAR data from the J-ERS-1 satellite since Spring 1992. Corner reflectors have been set up for J-ERS-1 SAR calibration at a site near Delta Junction, in central Alaska. Image quality and calibration analysis results from the Delta Junction site and others will be presented in this paper. The impact of the 3-bit Analog-to-Digital Converter and the automatic stepping of the gain as a function of range in the J-ERS-1 radar receiver on calibration performance has been assessed. Preliminary observations on J-ERS-1 SAR data are that the average Signal-to-Noise ratio is generally fairly low, in the range 5-6dB. Azimuth ambiguity levels are higher than preflight analysis indicated. Over land, the dynamic range in the backscatter at L-band for approximately 36 degree incidence angle is often fairly high.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience and Remote Sensing; Tokyo; Japan
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  • 6
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    SIR-C Calibration Results (1995)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE Trans. on Geoscience and Remote Sensing
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    Calibration Results for J-ERS-1 SAR Data Produced by the Alaska SAR Facility (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The Alaska SAR Facility has been receiving and processing SAR data from the J-ERS-1 satellite since Spring 1992. Corner reflectors have been set up for J-ERS-1 SAR calibration at a site near Delta Junction, in central Alaska. Image quality and calibration analysis results from the Delta Junction site and others will be presented in this paper. The impact of the 3-bit Analog-to-Digital Converter and the automatic stepping of the gain as a function of range in the J-ERS-1 radar receiver on calibration performance has been assessed. Preliminary observations on J-ERS-1 SAR data are that the average Signal-to-Noise ratio is generally fairly low, in the range 5-6 dB. Azimuth ambiguity levels are higher than preflight analysis indicated. Over land, the dynamic range in the backscatter at L-band for approximately 36 degree incidence angle is often fairly high...
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    The Effects of Noise on Polarimetric SAR Data (1993)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: Polarimetric SAR data can provide a great deal of information about the scattering behavior of the surface under observation. Polarimetric SAR systems often measure the scattering matrices of the areas under observation in linear polarizations (H and V). From the scattering matrix commonly used forms such as the covariance matrix and the Stokes matrix can be easily derived. Other measures derived from polarimetric SAR data include correlation coefficients between scattering matrix terms and the mode and variance of phase differences between scattering matrix terms. The effects of additive system noise on these measurements is not often considered in the literature on this subject. In this paper, the effects of additive system noise on measurements derived from polarimetric SAR data will be examined. It will be shown how first-order noise effects can be removed and how second-order noise effects can be reduced for some measurements...
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE, Geoscience & Remote Sensing; Tokyo; Japan
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Data Quality of the JERS-1 SAR Global Rain Forest Mapping (GRFM) Project (1998)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: The National Space Development Agency of Japan's (NASDA) JERS-1 SAR began collecting data in 1995 for the Global Rain Forest Mapping Project (GRFM). The GRFM data quality has been examined for products resulting from both the NASDA and Alaska SAR facility's (ASF) processing facilities.
    Keywords: Earth Resources and Remote Sensing
    Type: International Journal of Remote Sensing
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    A Continental Scale Mosaic of the Amazon Basin Using JERS-1 (1999)
    In:  Other Sources
    Details
    Publication Date: 2018-06-08
    Description: In the paper, a methodology, example, and accuracy assessment are given for a continental scale mosaic of the Amazon River basin at 100 m resolution using the JERS-1 satellite.
    Keywords: Earth Resources and Remote Sensing
    Type: IEEE Transactions on Geoscience and Remote Sensing
    Format: text
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