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  • GEOPHYSICS  (2)
  • ASTROPHYSICS  (1)
  • 1
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    Recognition of crops and soils by spot density measurements of imagery (1970)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Computerized techniques and methods were used to conduct preliminary soil and crop identification experiments. The soil identification experiment was conducted by making densitometer measurements on Ektachrome infrared film exposed at 14,000 feet. The density measurements were analyzed by plotting sample probability density functions, two-dimensional scatter plots, and the use of K-class I to determine the complete set of classification results for one, two, three and four features. Due to the presence of nineteen classes, crop identification experiments were more difficult to formulate. Classes of corn, fallow, harvested wheat, roadways, trees and water were classified 75 percent correct.
    Keywords: GEOPHYSICS
    Type: NASA. Manned Spacecraft Center 3d Ann. Earth Resources Program Rev., Vol. 2; 34 p
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Granulation in a main-sequence F-type star (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The modal approach developed by Nelson and Musman (1977) is used to investigate convection in an F-type main-sequence star (effective temperature of 7300 K, g = 10,000 cm per sec per sec). The convective velocities and intensity contrasts are found to be larger than in the sun. Even though the convective flux is less than 1% of the total flux at a mean optical depth of unity, the spectral-energy distribution is strongly reddened as a result of the fluctuating opacity. This has important implications in the conversion scale from observed colors to effective temperature. The scale of the surface granulation is expected to be in the range 1000-5000 km. Calculations of the combined H-He I and He II convection zones support the prediction of Toomre et al. (1976) that the stable region between the zones is well mixed
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 238
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Use of remote sensing techniques for inventorying and planning utilization of land resources in South Dakota (1974)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The basic procedures for interpreting remote sensing imagery to rapidly develop general soils and land use inventories were developed and utilized in Pennington County, South Dakota. These procedures and remote sensing data products were illustrated and explained to many user groups, some of whom are interested in obtaining similar data. The general soils data were integrated with land soils data supplied by the county director of equalization to prepare a land value map. A computer print-out of this map indicating a land value for each quarter section is being used in tax reappraisal of Pennington County. The land use data provided the land use planners with the present use of land in Pennington County. Additional uses of remote sensing applications are also discussed including tornado damage assessment, hail damage evaluation, and presentation of soil and land value information on base maps assembled from ERTS-1 imagery.
    Keywords: GEOPHYSICS
    Type: NASA-CR-140574 , SDSU-RSI-74-08
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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