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  • Other Sources  (46)
  • 2015-2019
  • 1980-1984  (38)
  • 1970-1974  (8)
  • 1955-1959
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  • 1
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    Microwave and optical remote sensing of forest vegetation (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The objectives and anticipated results of a study to define the strengths and limitations of microwave (SIR-B) and optical (thematic Mapper) data, singly and in combination, for the purpose of characterizing forest cover types and condition classes are described. Other specific objectives include: (1) the assessment of the effectiveness of a contextual classification algorithm (SECHO); (2) evaluation of the utility of different look angles of SAR data in determining differences in stand density of commercial forests; and (3) the determination of the effectiveness of the L-band HH polarized SIR-B data in differentiating forest-stand densities.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: JPL The SIR-B Sci. Invest. Plan; 3 p
    Format: text
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  • 2
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    The corn blight problem: 1970 and 1971 (1972)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Southern corn leaf blight is caused by the fungus, Helminthosporium maydis. Race T of H maydis adapted itself to the Texas male sterile cytoplasm corn. The problems caused by this variety of the blight in 1970 and 1971 are discussed, as well as the symptoms and development of the disease.
    Keywords: GEOPHYSICS
    Type: NASA. Manned Spacecraft Center 4th Ann. Earth Resources Program Review, Vol. 5; 19 p
    Format: application/pdf
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  • 3
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    Vegetation and soils field research data base: Experiment summaries (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Understanding of the relationships between the optical, spectral characteristics and important biological-physical parameters of earth-surface features can best be obtained by carefully controlled studies over fields and plots where complete data describing the condition of targets are attainable and where frequent, timely spectral measurement can be obtained. Development of a vegetation and soils field research data base was initiated in 1972 at Purdue University's Laboratory for Applications of Remote Sensing and expanded in the fall of 1974 by NASA as part of LACIE. Since then, over 250,000 truck-mounted and helicopter-borne spectrometer/multiband radiometer observations have been obtained of more than 50 soil series and 20 species of crops, grasses, and trees. These data are supplemented by an extensive set of biophysical and meteorological data acquired during each mission. The field research data form one of the most complete and best-documented data sets acquired for agricultural remote sensing research. Thus, they are well-suited to serve as a data base for research to: (1) quantiatively determine the relationships of spectral and biophysical characteristics of vegetation, (2) define future sensor systems, and (3) develop advanced data analysis techniques.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E86-10010 , NASA-CR-171894 , NAS 1.26:171894 , LARS-TR-042382
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  • 4
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    Remote sensing of agricultural crops and soils (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Research in the correlative and noncorrelative approaches to image registration and the spectral estimation of corn canopy phytomass and water content is reported. Scene radiation research results discussed include: corn and soybean LANDSAT MSS classification performance as a function of scene characteristics; estimating crop development stages from MSS data; the interception of photosynthetically active radiation in corn and soybean canopies; costs of measuring leaf area index of corn; LANDSAT spectral inputs to crop models including the use of the greenness index to assess crop stress and the evaluation of MSS data for estimating corn and soybean development stages; field research experiment design data acquisition and preprocessing; and Sun-view angles studies of corn and soybean canopies in support of vegetation canopy reflection modeling.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10107 , NASA-CR-171768 , SR-P3-04399 , NAS 1.26:171768 , LARS-022183
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  • 5
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    Effects of management practices on reflectance of spring wheat canopies (1980)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The effects of available soil moisture, planting date, nitrogen fertilization, and cultivar on reflectance of spring wheat (Triticum aestivum L.) canopies were investigated. Spectral measurements were acquired on eight dates throughout the growing season, along with measurements of crop maturity stage, leaf area index, biomass, plant height, percent soil cover, and soil moisture. Planting date and available soil moisture were the primary agronomic factors which affected reflectance of spring wheat canopies from tillering to maturity. Comparisons of treatments indicated that during the seedling and tillering stages planting date was associated with 36 percent and 85 percent of variation in red and near infrared reflectances, respectively. As the wheat headed and matured, less of the variation in reflectance was associated with planting date and more with available soil moisture. By mid July, soil moisture accounted for 73 percent and 69 percent of the variation in reflectance in red and near infrared bands, respectively. Differences in spectral reflectance among treatments were attributed to changes in leaf area index, biomass, and percent soil cover. Cultivar and N fertilization rate were associated with very little of the variation in the reflectance of these canopies.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10019 , NASA-CR-161003 , SR-PO-00458 , LARS-TR-051580
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  • 6
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    Remote sensing of agricultural crops and soils (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Research results and accomplishments of sixteen tasks in the following areas are described: (1) corn and soybean scene radiation research; (2) soil moisture research; (3) sampling and aggregation research; (4) pattern recognition and image registration research; and (5) computer and data base services.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E83-10023 , NASA-CR-167721 , SR-P2-04266 , NAS 1.26:167721 , LARS-113081
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  • 7
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    Soybean canopy reflectance as a function of view and illumination geometry (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The results of an experiment designed to characterize a soybean field by its reflectance at various view and illumination angles and by its physical and agronomic attributes are presented. Reflectances were calculated from measurements at four wavelength bands through eight view azimuth and seven view zenith directions for various solar zenith and azimuth angles during portions of three days. An ancillary data set consisting of the agronomic and physical characteristics of the soybean field is described. The results indicate that the distribution of reflectance from a soybean field is a function of the solar illumination and viewing geometry, wavelength and row direction, as well as the state of development of the canopy. Shadows between rows greatly affected the reflectance in the visible wavelength bands and to a lesser extent in the near infrared wavelengths. A model is proposed that describes the reflectance variation as a function of projected solar and projected viewing angles. The model appears to approximate the reflectance variations in the visible wavelength bands from a canopy with well defined row structure.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10394 , NASA-CR-167644 , SR-P2-04278 , NAS 1.26:167644 , LARS-042182
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  • 8
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    Design and evaluation of pick-up truck mounted boom for elevation of a multiband radiometer system (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Three concepts were considered for the boom design: a one-piece boom with a trolley, a folding boom, and a telescoping boom. The telescoping boom was selected over the other two concepts because of its easy manual operation. The boom is designed to mount on the bed of a pick-up truck and elevate the radiometer system 8 meters above the ground and 4 meters away from the truck. The selection of the boom components is discussed with justification of the final choice. Results of performance tests and one season's operation of the completed boom are reported.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E81-10150 , NASA-CR-160988 , SR-P1-04079 , LARS-TR-040981
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  • 9
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    Effects of nitrogen nutrition on the growth, yield and reflectance characteristics of corn canopies (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Spectral and agronomic measurements were collected from corn (Zea mays L.) canopies under four nitrogen treatment levels (0, 67, 134, and 202 kg/ha) on 11 dates during 1978 and 12 dates during 1979. Data were analyzed to determine the relationship between the spectral responses of canopies and their argonomic characteristics as well as the spectral separability of the four treatments. Red reflectance was increased, while the near infrared reflectance was decreased for canopies under nitrogen deprivation. Spectral differences between treatments were seen throughout each growing season. The near infrared/red reflectance ratio increased spectral treatment differences over those shown by single band reflectance measures. Of the spectral variables examined, the near infrared/red reflectance ratio most effectively separated the treatments. Differences in spectral response between treatments were attributed to varying soil cover, leaf area index, and leaf pigmentation values, all of which changed with N treatment.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10068 , NASA-CR-165090 , NAS 1.26:165090 , SR-P1-04044 , LARS-030381
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  • 10
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    Simulated response of a multispectral scanner over wheat as a function of wavelength and view/illumination direction (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The reflectance response with view angle of wheat, was analyzed. The analyses, which assumes there are no atmospheric effects, and otherwise simulates the response of a multispectral scanner, is based upon spectra taken continuously in wavelength from 0.45 to 2.4 micrometers at more than 1200 view/illumination directions using an Exotech model 20C spectra radiometer. Data were acquired six meters above four wheat canopies, each at a different growth stage. The analysis shows that the canopy reflective response is a pronounced function of illumination angle, scanner view angle and wavelength. The variation is greater at low solar elevations compared to high solar elevations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10144 , NASA-CR-167505 , NAS 1.26:167505 , SR-P1-04202 , LARS-071580
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