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  • EARTH RESOURCES AND REMOTE SENSING  (5)
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  • 1
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    Extensions and applications of a second-order landsurface parameterization (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Extensions and applications of a second order land surface parameterization, proposed by Andreou and Eagleson are developed. Procedures for evaluating the near surface storage depth used in one cell land surface parameterizations are suggested and tested by using the model. Sensitivity analysis to the key soil parameters is performed. A case study involving comparison with an "exact" numerical model and another simplified parameterization, under very dry climatic conditions and for two different soil types, is also incorporated.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-175144 , NAS 1.26:175144 , MIT-R83-8 , MIT-290
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Estimation of effective hydrologic properties of soils from observations of vegetation density (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A one-dimensional model of the annual water balance is reviewed. Improvements are made in the method of calculating the bare soil component of evaporation, and in the way surface retention is handled. A natural selection hypothesis, which specifies the equilibrium vegetation density for a given, water limited, climate soil system, is verified through comparisons with observed data. Comparison of CDF's of annual basin yield derived using these soil properties with observed CDF's provides verification of the soil-selection procedure. This method of parameterization of the land surface is useful with global circulation models, enabling them to account for both the nonlinearity in the relationship between soil moisture flux and soil moisture concentration, and the variability of soil properties from place to place over the Earth's surface.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-163002 , R80-7 , OSP-87326 , REPT-254
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    A second-order Budkyo-type parameterization of landsurface hydrology (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: A simple, second order parameterization of the water fluxes at a land surface for use as the appropriate boundary condition in general circulation models of the global atmosphere was developed. The derived parameterization incorporates the high nonlinearities in the relationship between the near surface soil moisture and the evaporation, runoff and percolation fluxes. Based on the one dimensional statistical dynamic derivation of the annual water balance, it makes the transition to short term prediction of the moisture fluxes, through a Taylor expansion around the average annual soil moisture. A comparison of the suggested parameterization is made with other existing techniques and available measurements. A thermodynamic coupling is applied in order to obtain estimations of the surface ground temperature.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-169432 , NAS 1.26:169432 , R82-36 , REPT-280
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Inference of effective soil properties from observed vegetal canopy density (1979)
    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: E79-10207 , NASA-CR-158562
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Feasibility of using LANDSAT images of vegetation cover to estimate effective hydraulic properties of soils (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Research activities conducted from February 1, 1985 to July 31, 1985 and preliminary conclusions regarding research objectives are summarized. The objective is to determine the feasibility of using LANDSAT data to estimate effective hydraulic properties of soils. The general approach is to apply the climatic-climax hypothesis (Ealgeson, 1982) to natural water-limited vegetation systems using canopy cover estimated from LANDSAT data. Natural water-limited systems typically consist of inhomogeneous vegetation canopies interspersed with bare soils. The ground resolution associated with one pixel from LANDSAT MSS (or TM) data is generally greater than the scale of the plant canopy or canopy clusters. Thus a method for resolving percent canopy cover at a subpixel level must be established before the Eagleson hypothesis can be tested. Two formulations are proposed which extend existing methods of analyzing mixed pixels to naturally vegetated landscapes. The first method involves use of the normalized vegetation index. The second approach is a physical model based on radiative transfer principles. Both methods are to be analyzed for their feasibility on selected sites.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E86-10003 , NASA-CR-176266 , NAS 1.26:176266
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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