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  • EARTH RESOURCES AND REMOTE SENSING  (75)
  • 1980-1984  (75)
  • 1955-1959
  • 1940-1944
  • 1
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    Geometric adjustment of simultaneous Doppler-derived range differences (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A mathematical model for the use of simultaneous Doppler derived correlated ranges in the geometric mode is presented. The model was tested with data taken during the EDOC-2 campaign with different integration intervals. The results of this adjustment are compared with the EDOC-2 adopted solution and those from an uncorrelated model used earlier to provide more economical calculations. It is shown that the correlated mode is superior to the uncorrelated one when the optimum integration interval of 23 seconds is used.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Basic Res. for the Geodyn. Program; p 46-94
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Effects of adopting new precession, nutation and equinox corrections on the terrestrial reference frame (1982)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: The effects of adopting new definitive precession and equinox corrections on the terrestrial reference frame was investigated. It is noted that: (1) the effect on polar motion is a diurnal periodic term with an amplitude increasing linearly in time whole on UT1 it is a linear term; (2) general principles are given to determine the effects of small rotations of the frame of a conventional inertial reference system (CIS) on the frame of the conventional terrestrial reference system (CTS); (3) seven CTS options are presented, one of which is necessary to accommodate such rotation. Accommodating possible future changes in the astronomical nutation is discussed. The effects of differences which may exist between the various CTS's and CIS's on Earth rotation parameters (ERP) and how these differences can be determined are examined. It is shown that the CTS differences can be determined from observations made at the same site, while the CIS differences by comparing the ERP's determined by the different techniques during the same time period.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Basic Res. for the Geodyn. Program; p 2-18
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Backpack VLBI terminal with subscentimeter capability (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Backpack portable equipment was developed to measure vector baseline from approximately 1 km to 100 km in length with subcentimeter to few centimeter accuracy. The equipment design features as well as the instrumentation specifications are discussed. It is shown that the unit has the following advantages: it is simple in concept; it is reliable in unattended operation; and it is inexpensive (less than $15,000 per unit).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 409-414
    Format: application/pdf
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  • 4
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    On the VLBI-satellite laser ranging Iron Triangle intercomparison experiment (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Simulations were performed to determine the suitability of the proposed station locations. The criterion was a comparison among the possible station configuration of the standard deviations of baseline and Earth rotation parameters estimated from a least squares covariance analysis. Only the relative magnitudes of the standard deviations were addressed in the analysis. Only random errors were assumed and no provision was made for systematic effects. The Iron Triangle, consisting of the stations at Westford (Haystack), Massachusetts, Owens Valley, California, and Ft. Davis, Texas, was regarded as the structure of the proposed network with options to incorporate either the Goldstone, California, or Green Bank, West Virginia, station or both. It was decided to include the Richmond, Florida, station in the analysis since it offered more North-South separation and therefore could strengthen the geometry of the network especially in the recovery of Earth rotation parameters.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Radio Interferometry; p 435-445
    Format: application/pdf
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  • 5
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    Polar motion and UT1: Comparison of VLBI, lunar laser, satellite laser, satellite Doppler, and conventional astrometric determinations (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Very long baseline interferometry observations made with a 3900 km baseline interferometer (Haystack Observatory in Massachusetts to Owens Valley Observation in California) were used to estimate changes in the X-component of the position of the Earth's pole and in UT1. These estimates are compared with corresponding ones from lunar laser ranging, satellite laser ranging, satellite Doppler, and stellar observations.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Radio Interferometry; p 33-44
    Format: application/pdf
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  • 6
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    Mapping New Zealand and Antarctic snowpack from LANDSAT (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Ther are no author-identified significant results in this report.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA. Goddard Space Flight Center Operational Appl. of Satellite Snowcover Observations; p 53-72
    Format: application/pdf
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  • 7
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    Identification and estimation of the area planted with irrigated rice based on the visual interpretation of LANDSAT MSS data (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The objective was to test the feasibility of the application of MSS-LANDSAT data to irrigated rice crop identification and area evaluation, within four rice growing regions of the Rio Grande do Sul state, in order to extend the methodology for the whole state. The applied methodology was visual interpretation of the following LANDSAT products: channels 5 and 7 black and white imageries and color infrared composite imageries all at the scale of 1:250.000. For crop identification and evaluation, the multispectral criterion and the seasonal variation were utilized. Based on the results it was possible to conclude that: (1) the satellite data were efficient for crop area identification and evaluation; (2) the utilization of the multispectral criterion, allied to the seasonal variation of the rice crop areas from the other crops and, (3) the large cloud cover percentage found in the satellite data made it impossible to realize a rice crop spectral monitoring and, therefore, to define the best dates for such data acquisition for rice crop assessment.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E84-10164 , NASA-CR-173640 , NAS 1.26:173640 , INPE-2991-NTE/212
    Format: application/pdf
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  • 8
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    The effect of earth orientation errors in baseline determination (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Baselines estimated from certain space techniques are susceptible to systematic errors affecting the relative coordinates. The set of parameters that describes the continuously changing relative orientation of the conventional terrestrial (CTS) and inertial (CIS) reference frames is one source of error. As a result of these errors, the coordinates of each terminal station may actually refer to a slightly different coordinate system and therefore errors will result when these coordinates are used to compute the length between the stations. The present paper examines the expected magnitudes of these errors and their possible presence in current solutions. To test for the presence of such errors, some of the NASA/GSFC preliminary SL5 monthly baseline variations during 1979-1981 were analyzed. It is found that the present level of accuracy and stability of the available parameters linking the CTS and CIS is unsatisfactory for centimeter level baseline length determinations. It is noted that the available options are either the use of strictly simultaneous SLR data sets or the improvement of the parameters linking the CTS and CIS.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Bulletin Geodesique (ISSN 0007-4632); 57; 3 19
    Format: text
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  • 9
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    Structure, composition and thermal state of the crust in Brazil (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Efforts in support of a geomagnetic survey of the Brazilian area are described. Software to convert MAGSAT data tapes to the Burroughs/B-6700 binary format was developed and tested. A preliminary analysis of the first total intensity anomaly map was performed and methodologies for more intensive analysis were defined. The sources for correlative geological, aeromagnetic, and gravimetric data are described.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10187 , NASA-CR-168615 , NAS 1.26:168615
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  • 10
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    Structure, composition and thermal state of the crust in Brazil (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Aeromagnetic survey data of the Minas Gerais areas were analyzed and compared with MAGSAT anomaly data. Initially the data set was used to determine the thickness of the magnetized crust. The value obtained is in agreement with crustal models derived from deep seismic sounding and gravity data, indicating that the bottom of the magnetized layer occurs close to the Moho transition. An analysis of the long wavelength pattern indicates that the anomalies form a series of lineations along the magnetic E-W. These are shown to be the result of attenuation. On the MAGSAT total intensity map localized anomalies are superimposed onto an anomaly background formed by alternating positive and negative patches. Implementation and testing of analysis software for MAGSAT data are also discussed.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10134 , NASA-CR-168517 , NAS 1.26:168517
    Format: application/pdf
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