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  • Other Sources  (7)
  • 1
    Publication Date: 2019-06-27
    Description: Near-real time operational applications of NOAA satellite enhanced thermal infrared imagery to snow monitoring for river flood forecasts, and a photographic overlay technique of imagery to enhance snowcover are presented. Ground truth comparisons show a thermal accuracy of approximately + or - 1 C for detection of surface radiative temperatures. The application of NOAA imagery to flood mapping is also presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: PAPER-11 , NASA. Goddard Space Flight Center Operational Appl. of Satellite Snowcover Observations; p 143-155
    Format: application/pdf
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  • 2
    Publication Date: 2019-06-27
    Description: The snow melt for a small watershed (5130 sq km) in Central Alaska was successfully monitored with ERTS imagery. Aerial photography was used as supporting data for periods without satellite coverage. Comparison both with actual measurements and with a computer model showed good agreement.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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  • 3
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. The snow melt for a small watershed (5130 sq km) in Central Alaska was successfully monitored with ERTS-1 imagery. Aerial photography was used as supporting data for periods without satellite coverage. Comparison both with actual measurements and with a computer model showed good agreement.
    Keywords: GEOPHYSICS
    Type: E74-10151 , NASA-CR-136210
    Format: application/pdf
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  • 4
    Publication Date: 2019-07-13
    Keywords: COMMUNICATIONS
    Type: Annual International Conference on Communications; Jun 19, 1972 - Jun 21, 1972; Philadelphia, PA
    Format: text
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  • 5
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    In:  Other Sources
    Publication Date: 2019-07-13
    Description: An important factor in establishing domestic or regional communication satellite systems which share a given frequency band is the positioning of the satellites in the arc of the geostationary orbit that is visible to the area to be served. A description is given of the results of orbit spacing studies performed with respect to the eight different space systems proposed to provide U.S. domestic communication services. Some tentative guidelines which may be of general use are proposed. Four sets of computer models were studied, taking into account quasi-homogeneous models, a five-system model, a heterogeneous model with 3-degree spacings, and a heterogeneous model with unequal spacings and with coordination.
    Keywords: COMMUNICATIONS
    Type: EASCON ''73; Electronics and Aerospace Systems Convention; Sep 17, 1973 - Sep 19, 1973; Washington, DC
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  • 6
    Publication Date: 2019-07-13
    Description: The author has identified the following significant results. The Chena River Basin was selected because of the availability of ground truth data for comparison. Very good agreement for snow distribution and rates of ablation was found between the ERTS-1 imagery, the snowmelt model, and field measurements. Monitoring snowmelt rates for relatively small basins appears to be practical. The main limitation of the ERTS-1 imagery is the interval of coverage. More frequent overflights providing coverage are needed for the study of transient hydrologic events. ERTS-1 data is most useful when used in conjunction with snowmelt prediction models and existing snow course data. These results should prove very useful in preliminary assessment of hydrologic conditions in ungaged watersheds and will provide a tool for month-to-month volume forecasting.
    Keywords: GEOPHYSICS
    Type: E74-10675 , NASA-CR-139242
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  • 7
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    In:  Permafrost and Periglacial Processes
    Publication Date: 2022-03-21
    Type: info:eu-repo/semantics/article
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