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  • 1
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    Geomagnetic Data from the US Magnetic Observatory Network (1992)
    In:  CASI
    Details
    Publication Date: 2014-09-25
    Description: The United States operates a network of, at present, 13 ground-based magnetic observatories. Continuous, one-minute digital vector and scalar geomagnetic field values have been recorded for the last decade, and extend about five years further back for several stations. Periodic, 3-component absolute measurements of the magnetic field are made to provide baseline reference data with which to determine calibrated field view values at all intervals. These data are now being made available on CD-ROM. The quality of the data depends upon a number of factors, including the types of instrumentation used to monitor and measure the field, the procedures and equipment used to collect and process the data, and the quality controls employed to check the data for erroneous values. These various factors are described here for the U.S. digital geomagnetic observatory data. The observatories have been undergoing an evolution over the last 15 years that will continue to significantly improve the accuracy, precision, and availability of geomagnetic data.
    Keywords: GEOPHYSICS
    Type: NASA. Goddard Space Flight Center, Types and Characteristics of Data for Geomagnetic Field Modeling; p 321-332
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Stable Ni isotopes and Be-10 and Al-26 in metallic spheroids from Meteor Crater, Arizona (1993)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The Canyon Diablo spheroids, which are found around Meteor Crater, Arizona, are nickel-enriched objects with diameters from less than 0.1 to several mm. Previous studies have suggested that the enrichment of nickel resulted either from shock-melting of S-rich areas followed by solidification of the liquids under strongly non-equilibrium conditions at rapid cooling rates during flight outward from the crater or from the selective oxidation of iron. Isotopic studies are an effective tool for constraining the degree of open-system evaporation experienced by a system. The purpose of this study was to see whether Ni isotopes had been fractionated by volatilization during spheroid formation. In addition, the cosmogenic nuclides Be-10 and Al-26 were measured to try to estimate the depths in the parent meteorite from which the spheroids came.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 3: N-Z; p 1547-1548
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    The comparative evaluation of ERTS-1 imagery for resource inventory in land use planning (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Multidiscipline team interpretation and mapping of resources for Crook County is nearly complete on 1:250,000 scale enlargements of ERTS-1 imagery. Maps of geology, landforms, soils and vegetation-land use are being interpreted to show limitations, suitabilities and geologic hazards for land use planning. Mapping of lineaments and structures from ERTS-1 imagery has shown a number of features not previously mapped in Oregon. A timber inventory of Ochoco National Forest has been made. Inventory of forest clear-cutting practices has been successfully demonstrated with ERTS-1 color composites. Soil tonal differences in fallow fields shown on ERTS-1 correspond with major soil boundaries in loess-mantled terrain. A digital classification system used for discriminating natural vegetation and geologic materials classes has been successful in separation of most major classes around Newberry Cauldera, Mt. Washington and Big Summit Prairie. Computer routines are available for correction of scanner data variations; and for matching scales and coordinates between digital and photographic imagery. Methods of Diazo film color printing of computer classifications and elevation-slope perspective plots with computer are being developed.
    Keywords: GEOPHYSICS
    Type: E74-10196 , NASA-CR-136369
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Natural resource inventory and monitoring in Oregon with ERTS imagery (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Natural resource inventory and monitoring in Oregon with ERTS-1 imagery
    Keywords: GEOPHYSICS
    Type: E73-10249 , PAPER-R2 , NASA. Goddard Space Flight Center Multidisciplinary(Regional Resource Surv.; p 161
    Format: text
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  • 5
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    Multi-discipline resource inventory of soils, vegetation and geology (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: The author has identified the following significant results. Computer classification of natural vegetation, in the vicinity of Big Summit Prairie, Crook County, Oregon was carried out using MSS digital data. Impure training sets, representing eleven vegetation types plus water, were selected from within the area to be classified. Close correlations were visually observed between vegetation types mapped from the large scale photographs and the computer classification of the ERTS data (Frame 1021-18151, 13 August 1972).
    Keywords: GEOPHYSICS
    Type: E73-10770 , NASA-CR-133137
    Format: application/pdf
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  • 6
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    Comparative evaluation of spatial features in automatic land use classification from photographic imagery (1973)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Five spatial features have been evaluated for their applicability in automatic land use classification of photographic imagery. Data arrays of approximately 10,000 square meters were classified on the basis of an 8 by 8 point data array. Statistical features, information features, sequency features and texture features were evaluated using a distance to prototype classifier and an adaptive classifier. The results indicate approximately 70% accuracy in the classification.
    Keywords: GEOPHYSICS
    Type: Conference on Machine processing of remotely sensed data; Oct 16, 1973 - Oct 18, 1973; West Lafayette, IN
    Format: text
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    NASA TECHNICAL REPORTS
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