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  • EARTH RESOURCES AND REMOTE SENSING  (2)
  • 1990-1994
  • 1975-1979  (2)
  • 1965-1969
  • 1925-1929
  • 1979  (2)
  • 1
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    Ocean Chlorophyll Studies from a U-2 Aircraft Platform (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Chlorophyll gradient maps of large ocean areas were generated from U-2 ocean color scanner data obtained over test sites in the Pacific and Atlantic Oceans. The delineation of oceanic features using the upward radiant intensity relies on an analysis method which presupposes that radiation backscattered from the atmosphere and ocean surface can be properly modeled using a measurement made at 778 nm. An estimation of the chlorophyll concentration was performed by properly ratioing radiances measured at 472 nm and 548 nm after removing the atmospheric effects. The correlation between the remotely sensed data and in-situ surface chlorophyll measurements was validated in two sets of data. The results show that the correlation between the in-situ measured chlorophyll and the derived quantity is a negative exponential function and the correlation coefficient was calculated to be -0.965.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-80574
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
  • 2
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    Elimination of environmental effects from Landsat radiance data (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A critical problem involved in quantitative multi-temporal sensing of the physical processes with Landsat is the fact that variations in the spectral signatures for a given target of interest result from a combined effect of target properties and the environmental factors such as sun angles, atmospheric conditions, etc. at the time of an overpass. In an attempt to solve the problem, a transformation procedure is developed to remove the environmental effects from the MSS radiance data. Mathematical derivation of the transformation procedure is elaborated and an example of testing the procedure is illustrated using suspended sediments reflectance data obtained by Landsat MSS during four different overpasses over the lower Mississippi River valley.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: ASP 79-218 , American Society of Photogrammetry, Annual Meeting; Mar 18, 1979 - Mar 24, 1979; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
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