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  • EARTH RESOURCES AND REMOTE SENSING  (841)
  • Physics  (602)
  • SOLAR PHYSICS
  • 1980-1984  (1,402)
  • 1970-1974  (393)
Collection
Keywords
Publisher
Years
Year
  • 11
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    Diode laser heterodyne observations of silicon monoxide in sunspots - A test of three sunspot models (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Absorption features from the 8 micron SiO fundamental (upsilon = 1-0) and hot bands (upsilon = 2-1) have been observed in sunspots at sub-Doppler resolution using a ground-based tunable diode laser heterodyne spectrometer. The observed line widths suggest an upper limit of 0.5 km/s for the microturbulent velocity in sunspot umbrae. Since the silicon monoxide abundance is very sensitive to sunspot temperature, the measured equivalent widths permit an unambiguous determination of the temperature-pressure relation in the upper layers of the umbral atmosphere. In the region of SiO line formation (log P sub g = 3.0-4.5), the results support the sunspot model suggested by Stellmacher and Wiehr (1970).
    Keywords: SOLAR PHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 269; June 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 12
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    Mapping land use changes in the carboniferous region of Santa Catarina, report 2 (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The techniques applied to MSS-LANDSAT data in the land-use mapping of Criciuma region (Santa Catarina state, Brazil) are presented along with the results of a classification accuracy estimate tested on the resulting map. The MSS-LANDSAT data digital processing involves noise suppression, features selection and a hybrid classifier. The accuracy test is made through comparisons with aerial photographs of sampled points. The utilization of digital processing to map the classes agricultural lands, forest lands and urban areas is recommended, while the coal refuse areas should be mapped visually.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E85-10017 , NASA-CR-168574 , NAS 1.26:168574 , INPE-2945-RPE/447
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 13
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    Radar and infrared remote sensing of geothermal features at Pilgrim Springs, Alaska (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: High-altitude radar and thermal imagery collected by the NASA research aircraft WB57F were used to examine the structural setting and distribution of radiant temperatures of geothermal anomalies in the Pilgrim Springs, Alaska area. Like-polarized radar imagery with perpendicular look directions provides the best structural data for lineament analysis, although more than half the mapped lineaments are easily detectable on conventional aerial photography. Radiometer data and imagery from a thermal scanner were used to evaluate radiant surface temperatures, which ranged from 3 to 17 C. The evening imagery, which utilized density-slicing techniques, detected thermal anomalies associated with geothermal heat sources. The study indicates that high-altitude predawn thermal imagery may be able to locate relatively large areas of hot ground in site-specific studies in the vegetated Alaskan terrain. This imagery will probably not detect gentle lateral gradients.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote Sensing of Environment; 12; Nov. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 14
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    Mapping project on land use changes in the carboniferous region of Santa Catarina (1983)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The utilization of remote sensing data for monitoring land use changes by means of digital image analysis is described. The following data were utilized: LANDSAT data from September 4, 1975, April 24, 1978, and September 8, 1981; LANDSAT paper photography data; area IV color photographs; IBGE topography maps, and auxiliary data about the Brazilian state of Santa Catarina. Three kinds of analyses of digital images were carried out. The project identified and mapped major classes of land use areas including urban areas, coal deposits, agricultural areas, forests, lakes, and flood plains. Five areas directly affected by coal exploration southeast of Santa Catarina are identified and described. In addition, the classification system used for organizing data about land cover in a hierarchical arrangement is presented. The project made use of two remote sensing data sources: data of MSS spectral (Mulitspectral Scanner System)/LANDSAT on a scale of 1:100,000 with approximately 80 m resolution, and infrared color aerial photographs on a scale of 1:45,000 with approximately 5 m resolution. Therefore, the classification system included three levels, two selected to be compatible with aerial photography data and the third to conform to the resolution of MSS/LANDSAT.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-173946 , NAS 1.26:173946 , INPE-2874-NTE/204
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 15
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    Improved definition of crustal magnetic anomalies for MAGSAT data (1982)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The routine correction of MAGSAT vector magnetometer data for external field effects such as the ring current and the daily variation by filtering long wavelength harmonics from the data is described. Separation of fields due to low altitude sources from those caused by high altitude sources is affected by means of dual harmonic expansions in the solution of Dirichlet's problem. This regression/harmonic filter procedure is applied on an orbit by orbit basis, and initial tests on MAGSAT data from orbit 1176 show reduction in external field residuals by 24.33 nT RMS in the horizontal component, and 10.95 nT RMS in the radial component.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10314 , NASA-CR-168889 , NAS 1.26:168889
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 16
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    Seasat data utilization project (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: During the three months of orbital operations, the satellite returned data from the world's oceans. Dozens of tropical storms, hurricanes and typhoons were observed, and two planned major intensive surface truth experiments were conducted. The utility of the Seasat-A microwave sensors as oceanographic tools was determined. Sensor and geophysical evaluations are discussed, including surface observations, and evaluation summaries of an altimeter, a scatterometer, a scanning multichannel microwave radiometer, a synthetic aperture radar, and a visible and infrared radiometer.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-CR-168557 , REPT-622-233
    Format: application/pdf
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  • 17
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    Microbial abundance and thermoluminescence of antarctic dry valley soils (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Soil Science; 117; 1, 19; 1974
    Format: text
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    NASA TECHNICAL REPORTS
  • 18
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    Landsat 4 results and their implications for agricultural surveys (1983)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Progress on defining the minimum Landsat-4 data characteristics needed for agricultural information in the U.S. and assessing the value-added capability of current technology to extract that level of information is reported. Emphasis is laid on the thematic mapper (TM) data and the ground processing facilities. TM data from all 7 bands for a rural Arkansas scene were examined in terms of radiometric, spatial, and geometric fidelity characteristics. Another scene sensed over Iowa was analyzed using three two-channel data sets. Although the TM data were an improvement over MSS data, no value differential was perceived. However, the development of further analysis techniques is still necessary to determine the actual worth of the improved sensor capabilities available with the TM, which actually has an MSS within itself.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: AAS PAPER 83-160
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    NASA TECHNICAL REPORTS
  • 19
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    Studies of high latitude current systems using MAGSAT vector data (1981)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The magnetic disturbance fields caused by global external current systems are considered with particular emphasis on improving the understanding of the physical processes which control high latitude current systems. Following processing the MAGSAT data were routinely plotted in the Universal Time (UT) format as well as in a polar plot format. The H'D'U' coordinate system, was adopted as the standard for representing the MAGSAT residual magnetic field vectors. A data file was generated and the TPOLAR computer code was developed to determine from the orbital elements, the time, latitude, and MLT of the extremum latitude of each transpolar segment of orbit. The precision of the vector data set from MAGSAT prompted an extended exploratory phase for data analysis procedures, modeling techniques and phenomenology.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E82-10188 , NASA-CR-168616 , NAS 1.26:168616 , PR-3
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    NASA TECHNICAL REPORTS
  • 20
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    California nearshore processes - ERTS 1 (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The detectability of many nearshore processes from ERTS is made possible due to the suspended sediment present in the coastal waters. From viewing and analyzing the California coastal imagery collected during the last year and a half, the overall current patterns and their changes have become evident. It is now possible to map monthly and seasonal changes that occur throughout the year. The original objectives of detecting currents, sediment transport, estuaries and river discharge have now been expanded to include the use of ERTS information in operational problems of the U.S. Army Corps of Engineers. This incorporates the detected nearshore features into planning and organizing shore protection facilities.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: International Symposium on Remote Sensing of Environment; Apr 15, 1974 - Apr 19, 1974; Ann Arbor, MI
    Format: text
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