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  • GEOPHYSICS  (1,061)
  • STRUCTURAL MECHANICS  (312)
  • COMMUNICATIONS  (299)
  • ASTROPHYSICS
  • 1970-1974  (1,551)
  • 1960-1964  (162)
Collection
Keywords
Years
Year
  • 11
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    Field-aligned currents and the auroral electrojet (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: A Nike Tomahawk with fields and particles payload was launched on Nov. 18, 1970, over a strong westward electrojet current and auroral forms moving rapidly to the east. Electron fluxes moving up and down the magnetic field lines were measured. Upward-moving electrons below 1-keV energy were dominant and were equivalent to a net downward electric current that fluctuated between .2 and .6 microamp/sq m during the flight above 130 km. As the rocket traversed this broad region of downward electric current over and to the north of the auroral forms, the horizontal electric field slowly rotated from east to west. The magnetic measurements indicate that the westward electrojet was a horizontal sheet of current several hundred kilometers in north-south extent.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research; 79; Aug. 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Design manual: Oxygen Thermal Test Article (OTTA) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The characteristics of a cryogenic tank for storing liquid hydrogen, nitrogen, oxygen, methane, or helium for an extended period of time with minimum losses are discussed. A description of the tank and control module, assembly drawings and details of major subassemblies, specific requirements controlling development of the system, thermal concept considerations, thermal analysis methods, and a record of test results are provided. The oxygen thermal test article thermal protection system has proven that the insulation system for cryogenic vessels is effective.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-CR-140209 , ER15961
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Applications of ERTS-1 imagery to terrestrial and marine environmental analyses in Alaska (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: ERTS-1 imagery provides a means of distinguishing and monitoring estuarine surface water circulation patterns and changes in the relative sediment load of discharging rivers on a regional basis. It also will aid local fishing industries by augmenting currently available hydrologic and navigation charts. The interpretation of geologic and vegetation features resulted in preparation of improved surficial geology, vegetation and permafrost terrain maps at a scale of 1:1 million utilizing ERTS-1 band 7 imagery. This information will be further utilized in a route and site selection study for the Nome to Kobuk Road in central Alaska. Large river icings along the proposed Alaska pipeline route have been monitored. Sea ice deformation and drift northeast of Point Barrow, Alaska has been measured and shorefast ice accumulation and ablation along the west coast of Alaska is being mapped for the spring and early summer seasons. These data will be used for route and site selection, regional environmental analysis, identification and inventory of natural resources, land use planning, and in land use regulation and management.
    Keywords: GEOPHYSICS
    Type: PAPER-E7 , NASA. Goddard Space Flight Center 3d ERTS-1 Symp., Vol. 1, Sect. B; p 1575-1606
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    New England reservoir management: Land use/vegetation mapping in reservoir management (Merrimack River Basin) (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The author has identified the following significant results. It is evident from this comparison that for land use/vegetation mapping the S190B Skylab photography compares favorably with the RB-57 photography and is much superior to the ERTS-1 and Skylab 190A imagery. For most purposes the 12.5 meter resolution of the S190B imagery is sufficient to permit extraction of the information required for rapid land use and vegetation surveys necessary in the management of reservoir or watershed. The ERTS-1 and S190A data products are not considered adequate for this purpose, although they are useful for rapid regional surveys at the level 1 category of the land use/vegetation classification system.
    Keywords: GEOPHYSICS
    Type: E74-10669 , NASA-CR-139239
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Remote sensing techniques for mapping range sites and estimating range yield (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Image interpretation procedures for determining range yield and for extrapolating range information were investigated for an area of the Pine Ridge Indian Reservation in southwestern South Dakota. Soil and vegetative data collected in the field utilizing a grid sampling design and digital film data from color infrared film and black and white films were analyzed statistically using correlation and regression techniques. The pattern recognition techniques used were K-class, mode seeking, and thresholding. The herbage yield equation derived for the detailed test site was used to predict yield for an adjacent similar field. The herbage yield estimate for the adjacent field was 1744 lbs. of dry matter per acre and was favorably compared to the mean yield of 1830 lbs. of dry matter per acre based upon ground observations. Also an inverse relationship was observed between vegetative cover and the ratio of MSS 5 to MSS 7 of ERTS-1 imagery.
    Keywords: GEOPHYSICS
    Type: NASA-CR-140394 , SDSU-RSI-73-19
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    A multilevel, multispectral data set analysis in the visible and infrared wavelength regions (1974)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10571 , NASA-CR-138646
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 17
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    Atmospheric density variations at 140 km deduced from precise satellite radar track ing data (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Atmospheric density variations at 140 km deduced from precise satellite radar tracking data
    Keywords: GEOPHYSICS
    Type: NASA-TM-X-64610
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 18
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    Evaluation of Skylab data for land use mapping (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The present work compares four multispectral data sets acquired within a 24-hour time period over an area in south-central Indiana in a land use analysis of the study area. Data sets were acquired by the 4-channel multispectral scanner (MSS) on the ERTS satellite, the Earth Resource Environmental Package (EREP) 13-channel MSS on Skylab, the color infrared photography from the EREP camera system, and the black and white multiband photography from the EREP camera system. Overall performance of MSS data sets was better than that of digitized photographic data sets. Digitized color IR data sets were better overall than digitized black and white sets. Also, overall performance of 'optimum' four channels in Skylab MSS data set was essentially the same as that for the ERTS MSS data sets. However, when the four channels in the Skylab MSS which most nearly correspond to those in the ERTS MSS were used, overall performance of Skylab MSS data set was significantly lower than that for the ERTS MSS.
    Keywords: GEOPHYSICS
    Type: AAS PAPER 74-143 , Annual Meeting; Aug 20, 1974 - Aug 22, 1974; Los Angeles, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 19
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    Kansas environmental and resource study: A Great Plains model (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. Improvement in the land use classification accuracy of ERTS-1 MSS multi-images over Kansas can be made using two distances between neighboring grey tone N-tuples instead of one distance. Much more information is contained texturally than spectrally on the Kansas image. Ground truth measurements indicate that reflectance ratios of the 545 and 655 nm wavebands provide an index of plant development and possibly physiological stress. Preliminary analysis of MSS 4 and 5 channels substantiate the ground truth interpretation. Results of the land use mapping experiment indicate that ERTS-1 imagery has major potential in regionalization. The ways in which land is utilized within these regions may then be studied more effectively than if no adequate regionalization is available. A model for estimating wheat yield per acre has been applied to acreage estimates derived from ERTS-1 imagery to project the 1973 wheat yields for a ten county area in southwest Kansas. The results are within 3% of the preharvest estimates for the same area prepared by the USDA. Visual identification of winter wheat is readily achieved by using a temporal sequence of images. Identification can be improve by stratifying the project area into subregions having more or less homogeneous agricultural practices and crop mixes.
    Keywords: GEOPHYSICS
    Type: E74-10229 , NASA-CR-136492
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 20
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    Arctic and subarctic environmental analyses utilizing ERTS-1 imagery (1973)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: There are no author-identified significant results in this report.
    Keywords: GEOPHYSICS
    Type: E74-10166 , NASA-CR-136293 , BMPR-7
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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