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  • EARTH RESOURCES AND REMOTE SENSING  (583)
  • 1985-1989  (170)
  • 1980-1984  (413)
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  • 1
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    Microwave backscatter and emission observed from Shuttle Imaging Radar B and an airborne 1.4 GHz radiometer (1985)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: A soil moisture experiment conducted with the Shuttle Imaging Radar B (SIR-B) is reported. SIR-B operated at 1.28 GHz provided the active microwave measurements, while a 4-beam pushbroom 1.4 GHz radiometer gave the complementary passive microwave measurements. The aircraft measurements were made at an altitude of 330 m, resulting in a ground resolution cell of about 100 m diameter. SIR-B ground resolution from 225 km was about 35 m. More than 150 agricultural fields in the San Joaquin Valley of California were examined in the experiment. The effect of surface roughness height on radar backscatter and radiometric measurements was studied.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 2
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    Calculations of radar backscattering coefficient of vegetation-covered soils (1984)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The present investigation has the objective to develop a simple 'user's' model for simulating the measured radar backscattering coefficients from vegetation-covered fields in conjunction with the data obtained by Jackson et al. (1980, 1982). The theoretical work reported by Fung and Eom (1981) provides the basis for the model. Certain modifications are related to a consideration of the effect of a vegetation canopy. The first part of the model is concerned with a description of scatter from rough bare soil, while the second part takes into account the effect of a vegetation cover. It is shown that the measured angular distribution of the backscattering coefficient of vegetation-covered fields can be satisfactory reproduced by using the developed model.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Remote Sensing of Environment (ISSN 0034-4257); 15; 119-133
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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    NASA TECHNICAL REPORTS
  • 3
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    Radiometric measurements over bare and vegetated fields at 1.4-GHz and 5-GHz frequencies (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: (Previously announced in STAR as N82-22587)
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Remote Sensing of Environment; 12; Sept
    Format: text
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  • 4
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    A model for microwave emission from vegetation-covered fields (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The measured brightness temperatures over vegetation-covered fields are simulated by a radiative transfer model which treats the vegetation as a uniform canopy with a constant temperature, over a moist soil which emits polarized microwave radiation. The analytic formula for the microwave emission has four parameters: roughness height, polarization mixing factor, effective canopy optical thickness, and single scattering albedo. A good representation has been obtained with the model for both the horizontally and vertically polarized brightness temperatures at 1.4 and 5 GHz frequencies, over fields covered with grass, soybean and corn. A directly proportional relation is found between effective canopy optical thickness and the amount of water present in the vegetation canopy. The effective canopy single scattering albedo depends on vegetation type.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: Journal of Geophysical Research; 87; Dec. 20
    Format: text
    Standort Signatur Erwartet Verfügbarkeit
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  • 5
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    Remote sensing of soil moisture (1984)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: Four major objectives are proposed: (1) to study the sensitivity of active and passive microwave remote sensing approaches to soil moisture variations; (2) to investigate the effect of vegetation cover on microwave backscatter and emission; (3) to test theoretical models of microwave backscatter and emission from a natural terrain against the observations obtained from SIR-B and aircraft radiometer flights; and (4) to estimate vegetation biomass with airborne visible and infrared sensors.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: JPL The SIR-B Sci. Invest. Plan; 4 p
    Format: text
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  • 6
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    Microwave radiometer experiment of soil moisture sensing at BARC test site during summer 1981 (1984)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Soil moisture was measured by truck mounted microwave radiometers at the frequencies of 1.4 GHz, 5 GHz, and 10.7 GHz. The soil textures in the two test sites were different so that the soil type effect of microwave radiometric response could be studied. Several fields in each test site were prepared with different surface roughnesses and vegetation covers. Ground truth on the soil moisture, temperature, and the biomass of the vegetation was acquired in support of the microwave radiometric measurements. Soil bulk density for each of the fields in both test sites was sampled. The soils in both sites were measured mechanically and chemically. A tabulation of the measured data is presented and the sensors and operational problems associated with the measurements are discussed.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: NASA-TM-86056 , NAS 1.15:86056
    Format: application/pdf
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  • 7
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    Aircraft remote sensing of soil moisture and hydrologic parameters, Taylor Creek, Florida, and Little River, Georgia, 1979 data report (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Experiments were conducted to evaluate aircraft remote sensing techniques for hydrology in a wide range of physiographic and climatic regions using several sensor platforms. The data were collected in late 1978 and during 1979 in two humid areas--Taylor Creek, Fla., and Little River, Ga. Soil moisture measurements and climatic observations are presented as well as the remote sensing data collected using thermal infrared, passive microwave, and active microwave systems.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E84-10010 , NASA-TM-85468 , NAS 1.15:85468 , ARR-NE-13
    Format: application/pdf
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  • 8
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    Development and testing of a rural credit supervision system at the level of counties and rural properties utilizing remote sensing techniqes (1984)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Remote sensing techniques for supporting the rural credit supervision system were developed and tested. The test area comprised the counties of Aracatuba and Guararapes, located in the State of Sao Paulo. Aerial photography, LANDSAT images and topographic charts were used. Aerial photographs were extremely useful for the out lining of properties boundaries with financing of sugarcane plantations by the Banco do Brasil S.A.. The percentage of correctly interpreted sugarcane on LANDSAT images, considering the 85 analyzed properties, was of 63.12%. The occurrence of atypical conditions such as excessive raining, sugarcane in bloom, and wind damaged sugarcane and sugarcane not harvested due to planning failures verified during the period the images were obtained, were some of the contributing factors associated with a low interpretation performance. An alternative approach was developed using several LANDSAT overpasses and auxiliary field data, which resulted in 91.77 percent correct.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E85-10018 , NASA-CR-168575 , NAS 1.26:168575 , INPE-3239-RPE/462
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 9
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    Calculations of radar backscattering coefficient of vegetation-covered soils (1983)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: A model for simulating the measured backscattering coefficient of vegetation-covered soil surfaces includes both coherent and incoherent components of the backscattered radar pulses from a rough sil surface. The effect of vegetation canopy scattering is also incorporated into the model by making the radar pulse subject to two-way attenuation and volume scattering when it passes through the vegetation layer. Model results agree well with the measured angular distributions of the radar backscattering coefficient for HH polarization at the 1.6 GHz and 4.75 GHz frequencies over grass-covered fields. It was found that the coherent scattering component is very important at angles near nadir, while the vegetation volume scattering is dominant at incident angles 30 degrees.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E83-10291 , NASA-TM-85006 , SM-G3-04400 , NAS 1.15:85006
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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  • 10
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    Radiometric measurements over bare and vegetated fields at 1.4 GHz and 5 GHz frequencies (1981)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Microwave emission from bare and vegetated fields was measured with dual polarized radiometers at 1.4 GHz and 5 GHz frequencies. The measured brightness temperatures over bare fields are shown to compare favorably with those calculated from radiative transfer theory with two constant parameters characterizing surface roughness effect. The presence of vegetation cover is found to reduce the sensitivity to soil moisture variation. This sensitivity reduction is generally pronounced the denser, the vegetation cover and the higher the frequency of observation. The effect of vegetation cover is also examined with respect to the measured polarization factor at both frequencies. With the exception of dry corn fields, the measured polarization factor over vegetated fields is found appreciably reduced compared to that over bare fields. A much larger reduction in this factor is found at 5GHz than at 1.4GHz frequency.
    Schlagwort(e): EARTH RESOURCES AND REMOTE SENSING
    Materialart: E82-10110 , NASA-TM-82151 , NAS 1.15:82151 , SM-G1-04113
    Format: application/pdf
    Standort Signatur Erwartet Verfügbarkeit
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