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  • EARTH RESOURCES AND REMOTE SENSING  (143)
  • 1980-1984  (143)
  • 1970-1974
  • 1980  (143)
  • 1
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    Thermal mapping, geothermal source location, natural effluents and plant stress in the Mediterranean coast of Spain (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Although no significant results were achieved during the report period, research continues. A sample of imagery showing thermal inertia and temperature differences over the northeastern United States and Europe was received. The project coordinator attended a TELLUS Project meeting in Ispra, Italy at which general guidelines for the future were established and the quality of the data received was discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10119 , NASA-CR-164113 , PR-3
    Format: application/pdf
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  • 2
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    Studies of high latitude current systems using Magsat vector data (1980)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Disturbance fields caused by global external current systems are analyzed in order to gain an improved understanding of the phydical processes which control high latitude current systems and to increase the confidence level in the identification of internal field levels. The basic approach is to: (1) categorize the vector data by those physical parameters important for investigation of external current systems; (2) map the disturbances for appropriate conditions; (3) model the currents which might cause the mapped disturbances; and (4) correlate results with data from other sources. It is concluded that the Magsat data set appears to have remarkably high precision and quality and should permit major advances to be made in modeling current distribution at high latitudes in the ionosphere and magnetosphere.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10085 , NASA-CR-163785 , PR-1
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  • 3
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    LACIE - An application of meteorology for United States and foreign wheat assessment (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: This paper describes the overall Large Area Crop Inventory Experiment technical approach utilizing the global weather-reporting network and the Landsat satellite to make a quasi-operational application of existing research results, and the accomplishments of this cooperative experiment in utilizing the weather information. Global weather data were utilized in preparing timely yield estimates for selected areas of the U.S. Great Plains, the U.S.S.R. and Canada. Additionally, wheat yield models were developed and pilot tested for Brazil, Australia, India and Argentina. The results of the work show that heading dates for wheat in North America can be predicted with an average absolute error of about 5 days for winter wheat and 4 days for spring wheat. Independent tests of wheat yield models over a 10-year period for the U.S. Great Plains produced a root-mean-square error of 1.12 quintals per hectare (q/ha) while similar tests in the U.S.S.R. produced an error of 1.31 q/ha. Research designed to improve the initial capability is described as is the rationale for further evolution of a capability to monitor global climate and assess its impact on world food supplies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Journal of Applied Meteorology; 19; Jan. 198
    Format: text
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  • 4
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    Complexities of nadir-looking radiometric temperature measurements of plant canopies (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Effective radiant temperatures (ERTs) of five wheat canopies in different stages of development were measured during morning and noon periods. The observed variability in nadir sensor response was quantitatively described as a function of canopy structure and the vertical temperature profile of canopy components. In many cases, the nadir sensor ERT was a poor measure of vegetation temperature due to effects of soil emissions. Strong vertical temperature profiles of vegetation components were also observed. The theory and measurements presented document that remote measurements of vegetation canopy temperatures cannot be made indiscriminately over large spatial regions without consideration of the underlying physical principles.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Applied Optics; 19; July 1
    Format: text
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  • 5
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    View angle effects in the radiometric measurement of plant canopy temperatures (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The thermal infrared sensor response from a wheat canopy was extremely non-Lambertian because of spatial variations in energy flow processes; the effective radiant temperature of the sensor varied as much as 13 C with changing view angle. This variation of sensor response was accurately quantified (root-mean-square of deviations between theoretical and measured responses reduced to 1.1 C) as a function of vegetation canopy geometry, vertical temperature distribution of canopy components, and sensor view angle. The results have important implications for optimizing sensor view angles for remote sensing missions.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment; 10; Dec. 198
    Format: text
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  • 6
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    Snow Electromagnetic Measurements (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: An electromagnetic system is described for measuring the dielectric constant and attenuation of snow samples in the frequency range of 4 to 12 GHz. System components consists of a swept-frequency source, microwave horns, network analyzer, and XY plotter. The procedure for calibrating the effect of wetness on the snow properties is described. Equations are given that express the experimentally determined relation between attenuation per unit length and volume percent wetness at any frequency between 4 and 12 GHz. permittivity can be calculated from the snow density, attenuation per unit length, and frequency. Some applications of the techniques are described such as runoff forecasting from mountain snowpacks.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Microwave Remote Sensing of Snowpack Properties; p 93-117
    Format: text
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  • 7
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    Enumeration of prairie wetlands with Landsat and aircraft data (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: A method is described for estimating wetland abundance in the 700,000 sq km prairie pothole region of North America. A double sampling procedure is described, incorporating the use of high resolution aircraft imagery, capable of delineating ponds as small as 5 m across, as a means of adjusting the count of surface water features derived from the low-resolution Landsat census over a 38,876 sq km area in east-central North Dakota. The regression expansion formula used to estimate the actual number of total wetlands is also presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Photogrammetric Engineering and Remote Sensing; 46; May 1980
    Format: text
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  • 8
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    The USNO/NRL Green Bank interferometer program (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Application of the connected-element radio interferometer of the National Radio Astronomy Observation in Green Bank, West Virginia to the determination of improved source coordinates, astronomical constants, and variations in Earth rotation parameters is discussed. It is concluded that because of the brevity and discontinuity of the data so far no reliable conclusions regarding the accuracy of the data can be drawn.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 63-70
    Format: application/pdf
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  • 9
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    NOS/NGS activities to support development of radio interferometric surveying techniques (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: National Geodetic Survey activities towards the development of operational geodetic survey systems based on radio interferometry are reviewed. Information about the field procedures, data reduction and analysis, and the results obtained to date is presented.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 9-22
    Format: application/pdf
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  • 10
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    Trophic classification of Tennessee Valley area reservoirs derived from LANDSAT multispectral scanner data (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: LANDSAT MSS data from four different dates were extracted from computer tapes using a semiautomated digital data handling and analysis system. Reservoirs were extracted from the surrounding land matrix by using a Band 7 density level slice of 3; and descriptive statistics to include mean, variance, and ratio between bands for each of the four bands were calculated. Significant correlations ( 0.80) were identified between the MSS statistics and many trophic indicators from ground truth water quality data collected at 35 reservoirs in the greater Tennessee Valley region. Regression models were developed which gave significant estimates of each reservoir's trophic state as defined by its trophic state index and explained in all four LANDSAT frames at least 85 percent of the variability in the data. To illustrate the spatial variations within reservoirs as well as the relative variations between reservoirs, a table look up elliptical classification was used in conjunction with each reservoir's trophic state index to classify each reservoir on a pixel by pixel basis and produce color coded thematic representations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10008 , NASA-CR-163528
    Format: application/pdf
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