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  • Other Sources  (4)
  • EARTH RESOURCES AND REMOTE SENSING  (4)
  • 1990-1994  (3)
  • 1985-1989  (1)
  • 1965-1969
  • 1935-1939
  • 1
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    Terrain effects on backscattering coefficients derived from multifrequency, polarimetric SAR data (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A set of multidate, multilook angle polarimetric SAR data, acquired in Pennsylvania during July 1990 was recorded to determine the effect of local incidence angle. Cosine-based and polynomial models are found to be equally good for correcting SAR data for local incidence angle effects. A modified approach, considering the correction factor as additive rather than multiplicative, gave better results. The standard error in the estimation of soil moisture improves from 8.1 to 5.8 after applying corrections to incidence angle effects.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: In: IGARSS '92; Proceedings of the 12th Annual International Geoscience and Remote Sensing Symposium, Houston, TX, May 26-29, 1992. Vol. 1 (A93-47551 20-43); p. 86-88.
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  • 2
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    Processing of polarimetric SAR data for soil moisture estimation over Mahantango watershed area (1992)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Microwave remote sensing technique has a high potential for measuring soil moisture due to the large contrast in dielectric constant of dry and wet soils. Recent work by Pults et al. demonstrated the use of X/C-band data for quantitative surface soil moisture extraction from Airborne Synthetic Aperture Radar (SAR) system. Similar technique was adopted using polarimetric SAR data acquired with the JPL-AIRSAR system over the Mahantango watershed area in central Pennsylvania during July 1990. The data sets reported include C-, L-, and P-bands of 10, 13, 15, and 17 July 1990.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL, Summaries of the Third Annual JPL Airborne Geoscience Workshop. Volume 3: AIRSAR Workshop; p 65-68
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  • 3
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    Snow cover, snowmelt and runoff in the Himalayan River basins (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Not withstanding the seasonal vagaries of both rainfall amount and snowcover extent, the Himalayan rivers retain their basic perennial character. However, it is the component of snowmelt yield that accounts for some 60 to 70 percent of the total annual flow volumes from Hamilayan watersheds. On this large hydropotential predominantly depends the temporal performance of hydropower generation and major irrigation projects. The large scale effects of Himalayan snowcover on the hydrologic responses of a few selected catchments in western Himalayas was studied. The antecedent effects of snowcover area on long and short term meltwater yields can best be analyzed by developing appropriate hydrologic models forecasting the pattern of snowmelt as a function of variations in snowcover area. It is hoped that these models would be of practical value in the management of water resources. The predictability of meltwater for the entire snowmelt season was studied, as was the concurrent flow variation in adjacent watersheds, and their hydrologic significance. And the applicability of the Snowmelt-Runoff Model for real time forecast of daily discharges during the major part of the snowmelt season is examined.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-182434 , NAS 1.26:182434
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  • 4
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    Integrated imaging experiment with C-SAR and other geological image data across the Nelson Front, Northern Manitoba (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: This paper presents preliminary results from the integration of geophysical and geological data sets using Bayesian statistical analysis with the purpose of mapping the Churchill-Superior Boundary zone. In the Wabowden area the contribution of each rock type to the aeromagnetic anomaly is judged by convolving the aeromagnetic anomaly value with the average magnetic susceptibility. The 'a posteriori' probabilities of significant patterns in the new data are then computed. The highest 'a posteriori' probability occurs along a narrow corridor whose trend coincides remarkably with the location of the Churchill-Superior Boundary Zone. In the Wekusko Lake area, C-SAR and TM data were integrated using an image analysis system. Here the emphasis is on mapping of geological structures.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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