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  • 1
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    Measurements of the intensity-distribution of the white X radiation reflected from a crystal; with a note on the dispersion of the atomic scattering factor of zinc near theKabsorption edge (1939)
    Institute of Physics
    Details
    Publication Date: 1939-07-01
    Print ISSN: 0959-5309
    Topics: Physics
    Published by Institute of Physics
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    PAPER CURRENT
  • 2
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    Procedures for analysis of spatial relationships among ship survey data and sea surface temperature (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The establishment of a limited spatial data base for the U.S. eastern seaboard vicinity is discussed along with the demonstration of computer assisted analysis techniques for investigating spatial patterns and relationships among ship survey data and remotely sensed sea surface temperature. Ship survey variables included concentrations of two zooplankton, two icthyoplankton, and two fish species, in addition to physical data of depth to bottom and surface and bottom water temperatures. Continuous spatial distributions of these data were created by both weighted nearest neighbor and iterative smoothing interpolation techniques. Maps of surface water temperature were created by digitizing GOES satellite images. All mapped data were spatially registered by conversion of latitude and longitude coordinates to rotated Lambert conic conformal rectilinear coordinates and stored in grid format of approximately one hundred square kilometers per cell. The analysis of these data include the generation of statistical summaries and maps describing the joint occurrence among variables.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2d Eastern Reg. Remote Sensing Appl. Conf.; p 353-365
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Fundamental procedures of geographic information analysis (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Analytical procedures common to most computer-oriented geographic information systems are composed of fundamental map processing operations. A conceptual framework for such procedures is developed and basic operations common to a broad range of applications are described. Among the major classes of primitive operations identified are those associated with: reclassifying map categories as a function of the initial classification, the shape, the position, or the size of the spatial configuration associated with each category; overlaying maps on a point-by-point, a category-wide, or a map-wide basis; measuring distance; establishing visual or optimal path connectivity; and characterizing cartographic neighborhoods based on the thematic or spatial attributes of the data values within each neighborhood. By organizing such operations in a coherent manner, the basis for a generalized cartographic modeling structure can be developed which accommodates a variety of needs in a common, flexible and intuitive manner. The use of each is limited only by the general thematic and spatial nature of the data to which it is applied.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2d Eastern Reg. Remote Sensing Appl. Conf.; p 269-281
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Extending the utility of forest cover maps (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A computer-assisted map analysis system is discussed that characterizes timber supply in terms of standing timber; accessibility considering various harvesting factors; and availability as affected by ownership patterns of timberlands. Factors affecting harvesting include proximity to existing roads and consideration of terrain characteristics. Availability considerations include size of ownership, housing density and excluded areas. The model is demonstrated for a seventy square mile tract in western Massachusetts.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center 2nd Eastern Reg. Remote Sensing Appl. Conf.; p 89-99
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Cartographic Modeling: Computer-assisted Analysis of Spatially Defined Neighborhoods (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Cartographic models addressing a wide variety of applications are composed of fundamental map processing operations. These primitive operations are neither data base nor application-specific. By organizing the set of operations into a mathematical-like structure, the basis for a generalized cartographic modeling framework can be developed. Among the major classes of primitive operations are those associated with reclassifying map categories, overlaying maps, determining distance and connectivity, and characterizing cartographic neighborhoods. The conceptual framework of cartographic modeling is established and techniques for characterizing neighborhoods are used as a means of demonstrating some of the more sophisticated procedures of computer-assisted map analysis. A cartographic model for assessing effective roundwood supply is briefly described as an example of a computer analysis. Most of the techniques described have been implemented as part of the map analysis package developed at the Yale School of Forestry and Environmental Studies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Marshall Univ. Proc. of the Natl. Conf. on Energy Resource Management, Vol. 1; p 267-278
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Spatially Characterizing Effective Timber Supply (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The structure of a computer-oriented cartographic model for assessing roundwood supply for generation of base load electricity is discussed. The model provides an analytical procedure for coupling spatial information of harvesting economics and owner willingness to sell stumpages. Supply is characterized in terms of standing timber; of accessibility considering various harvesting and hauling factors; and of availability as affected by ownership and residential patterns. Factors governing accessibility to timber include effective harvesting distance to haulic roads as modified by barriers and slopes. Haul distance is expressed in units that take into account the relative ease of travel along various road types to a central processing facility. Areas of accessible timber are grouped into spatial units, termed 'timbersheds', of common access to particular haul road segments that belong to unique 'transport zones'. Timber availability considerations include size of ownership parcels, housing density and excluded areas. The analysis techniques are demonstrated for a cartographic data base in western Massachusetts.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Marshall Univ. Proc. of the Natl. Conf. on Energy Resource Management, Vol. 1; p 256-266
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 7
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    Extracting scene feature vectors through modeling, volume 3 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The remote estimation of the leaf area index of winter wheat at Finney County, Kansas was studied. The procedure developed consists of three activities: (1) field measurements; (2) model simulations; and (3) response classifications. The first activity is designed to identify model input parameters and develop a model evaluation data set. A stochastic plant canopy reflectance model is employed to simulate reflectance in the LANDSAT bands as a function of leaf area index for two phenological stages. An atmospheric model is used to translate these surface reflectances into simulated satellite radiance. A divergence classifier determines the relative similarity between model derived spectral responses and those of areas with unknown leaf area index. The unknown areas are assigned the index associated with the closest model response. This research demonstrated that the SRVC canopy reflectance model is appropriate for wheat scenes and that broad categories of leaf area index can be inferred from the procedure developed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-147742
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Signature extension for sun angle, volume 1 (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Within a restricted zenith sun angle range of 35 - 50 degrees, it was empirically observed that canopy reflectance is mainly Lambertian. Reflectance changes with crop stage were simple shifts in scale in the sun angle range. It was noted that sun angle variations depend on canopy characteristics. Effects of the vegetative canopy were most pronounced at the larger solar zenith angles (20 %). The linear sun angle correction coefficients demonstrate a dependency on both crop stage (15-20 %) and crop type (10-20 %). The use of canopy reflectance modeling allowed for the generation of a simulated data set over an extremely broad envelope of sun angles.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10272 , NASA-CR-147464
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Signature extension for spectral variation in soils, volume 4 (1976)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The reduced 1975-1976 field data at Garden City, Kansas are presented. These data are being used to evaluate the SRVC model predictions, to compare the ERIM-SUITS model with both the SRVC results and field data, and finally, to provide a data base for reviewing multitemporal trajectories. In particular, the applicability of the tasselled cap transformation is reviewed. The first detailed verification of this approach utilizing actual field measured data from the LACIE field measurement program, rather than LANDSAT data, is given.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-151157
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Signature extension for sun angle, volume 2 (1975)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E76-10273 , NASA-CR-147465
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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