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  • Inorganic Chemistry  (637)
  • EARTH RESOURCES AND REMOTE SENSING  (560)
  • 1995-1999
  • 1980-1984  (1,197)
  • 1910-1914
  • 1984  (1,197)
Collection
Keywords
Publisher
Years
  • 1995-1999
  • 1980-1984  (1,197)
  • 1910-1914
Year
  • 11
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    Ice sheet margins and ice shelves (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The effect of climate warming on the size of ice sheet margins in polar regions is considered. Particular attention is given to the possibility of a rapid response to warming on the order of tens to hundreds of years. It is found that the early response of the polar regions to climate warming would be an increase in the area of summer melt on the ice sheets and ice shelves. For sufficiently large warming (5-10C) the delayed effects would include the breakup of the ice shelves by an increase in ice drainage rates, particularly from the ice sheets. On the basis of published data for periodic changes in the thickness and melting rates of the marine ice sheets and fjord glaciers in Greenland and Antarctica, it is shown that the rate of retreat (or advance) of an ice sheet is primarily determined by: bedrock topography; the basal conditions of the grounded ice sheet; and the ice shelf condition downstream of the grounding line. A program of satellite and ground measurements to monitor the state of ice sheet equilibrium is recommended.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
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    NASA TECHNICAL REPORTS
  • 12
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    Earth resources research using the Shuttle Imaging Radar system (1984)
    In:  CASI
    Details
    Publication Date: 2019-08-13
    Description: The Shuttle Imaging Radar (SIR) is an L-band synthetic radar that transmits and receives horizontally polarized microwave radiation. It was originally launched on the second Shuttle test flight (STS-2) in November 1981 with the antenna depression angle fixed at 43 deg. In this configuration, the radar system was referred to as SIR-A, and it collected more than then a million square kilometers of Earth imagery in a variety of areas situated between 38 deg north and south latitude. SIR-A data was optically recorded onboard the Shuttle, and it was subsequently correlated on the ground to produce imagery with a 50 kilometer swath width and a surface resolution of approximately 40 meters. The SIR is presently being upgraded into a new configuration termed SIR-B, in which the radar's antenna can be mechanically rotated in the Shuttle's payload bay during an orbital mission. SIR-B is currently scheduled for flight on the seventeenth Shuttle mission (STS-17) that is tentatively planned for August 1984. In its new configuration, the SIR-B can be used to image selected regions at different angles of incidence ranging from 15 deg to 60 deg (as measured from the local vertical). In principle, multiple incidence angle radar imagery of selected areas can be coregistered and used to differentiate surficial materials on the basis of their roughness characteristics. This procedure is conceptually similar to the use of multispectral imagery acquired at shorter wavelengths to discriminate surficial materials on the basis of their pigmentation.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: AGARD Space System Applications to Tactical Operations; 1 p
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    NASA TECHNICAL REPORTS
  • 13
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    AgRISTARS (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-20
    Description: An introduction to the overall AgRISTARS program, a general statement on progress, and separate summaries of the activities of each project, with emphasis on the technical highlights are presented. Organizational and management information on AgRISTARS is included in the appendices, as is a complete bibliography of publication and reports.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: NASA-TM-89660 , JSC-18920 , NAS 1.26:171947
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    NASA TECHNICAL REPORTS
  • 14
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    Remote detection of geobotanical anomalies associated with hydrocarbon microseepage using thematic mapper simulator (TMS) and airborne imaging spectrometer (AIS) data (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: An interpretation of TMS and AIS data sets collected from Lost River, West Virginia, are presented, along with a brief review of the supervised vegetation classification approach to vegetation mapping used at Lost River. A preliminary study of AIS data suggests that contiguous high-spectral resolution data from a very limited portion of the spectrum (1.2-1.5 micron) provide a greater discriminatory capability than do broad-band sensors such as the TMS covering of wider spectral range (0.45-2.35 microns).
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote sensing for geological mapping; Proceedings of the Seminar; Feb 02, 1984 - Feb 04, 1984; Orleans; France
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    NASA TECHNICAL REPORTS
  • 15
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    Geologic interpretation of Seasat SAR imagery near the Rio Lacantum, Mexico (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A mosaic of the Seasat Synthetic Aperture Radar (SAR) optically processed images over Central America is presented. A SAR image of the Rio Lacantum area (southeastern Mexico) has been digitally processed and its interpretation is presented. The region is characterized by low relief and a dense vegetation canopy. Surface is believed to be indicative of subsurface structural features. The Seasat-SAR system had a steep imaging geometry (incidence angle 23 + or - 3 deg off-nadir) which is favorable for detection of subtle topographic variations. Subtle textural features in the image corresponding to surface topography were enhanced by image processing techniques. A structural and lithologic interpretation of the processed images is presented. Lineaments oriented NE-SW dominate and intersect broad folds trending NW-SE. Distinctive karst topography characterizes one high relief area
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Remote sensing for geological mapping; Proceedings of the Seminar; Feb 02, 1984 - Feb 04, 1984; Orleans; France
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  • 16
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    Testing the radiometric stability of HCMM thermal infrared data (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: A study conducted to test the radiometric stability of thermal infrared (TIR) data from the heat-capacity mapping mission (HCMM) satellites is considered. The radiance values associated with various land use and cover types in a regional study area centered on Washington, D.C. are examined. The study shows that for three different day TIR-data sets, the relative ranking of mean thermal values associated with five Level I and three Level II land-use/land-cover categories remains constant over time. Although HCMM predicted temperatures show variability up to 5 C from ground observed temperatures, the thermal measurements recorded by the satellite are fairly stable as indicators of surface temperature. A method for combining HCMM thermal data and Landsat multispectral scanner (MSS) data to improve the classification of Level I land-cover categories, and in particular the separability of urban and nonurban areas is described. A merged HCMM-MSS data set is found to yield the best results in terms of thematic-map accuracy.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Canadian Symposium on Remote Sensing; May 03, 1983 - May 06, 1983; Montreal; Canada
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  • 17
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    Use of satellite data in agricultural surveys (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The state-of-the-art of crop surveying by satellite is reviewed with an emphasis on the signature extension problem. Registration and preprocessing procedures are discussed with refereence to: normalization of the radiometric values of each scene for scene-to-scene differences; registration techniques, implemented at the NASA Johnson Space Center, capable of 0.5 pixel root-mean-square error; and current research in this direction. Data transformation and modeling techniques applied to the Landsat MSS images and a solution for the field-to-field variations of the greenness and brightness temporal trajectories are included. Finally, a review of the mixture decomposition method of labeling and estimating the areal proportions is given.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Spectral signatures of objects in remote sensing; International Conference; Sep 12, 1983 - Sep 16, 1983; Bordeaux; France
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    NASA TECHNICAL REPORTS
  • 18
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    Estimation of agronomic variables using spectral signatures (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Techniques for the determination of leaf area index or leaf angle distribution from remote-sensing canopy-reflectance (CR) measurements are developed on the basis of empirical models relating CR to parameters such as soil and vegetation spectral properties, solar flux, and viewing angle. A general procedure for inverting CR models is presented and applied to the models of Suits (1972), Verhoef and Bunnik (1981), and Norman (1979) in the IR range. Numerical results for a soybean canopy are compared in a table, and the error sensitivity of the inverted models is shown to be relatively high, requiring the use of ancillary data such as soil reflectance, leaf reflectance, and leaf transmittance.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: Spectral signatures of objects in remote sensing; International Conference; Sep 12, 1983 - Sep 16, 1983; Bordeaux; France
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    NASA TECHNICAL REPORTS
  • 19
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    Study of the urban evolution of Brasilia with the use of LANDSAT data (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The urban growth of Brasilia within the last ten years is analyzed with special emphasis on the utilization of remote sensing orbital data and automatic image processing. The urban spatial structure and the monitoring of its temporal changes were focused in a whole and dynamic way by the utilization of MSS-LANDSAT images for June 1973, 1978 and 1983. In order to aid data interpretation, a registration algorithm implemented at the Interactive Multispectral Image Analysis System (IMAGE-100) was utilized aiming at the overlap of multitemporal images. The utilization of suitable digital filters, combined with the images overlap, allowed a rapid identification of areas of possible urban growth and oriented the field work. The results obtained permitted an evaluation of the urban growth of Brasilia, taking as reference the proposed stated for the construction of the city.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E85-10101 , NASA-CR-175830 , NAS 1.26:175830 , INPE-3322-RPE/468 , Congr. Intern. de Fotogrametria e Sensoriamento Remoto; Jun 01, 1984; Rio de Janeiro; Brazil|Jul 01, 1984
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  • 20
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    CNPq/INPE LANDSAT system: Report of activities from October 1, 1983 to September 30, 1984 (1984)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The status of Brazilian facilities for receiving, recording, processing, and distributing LANDSAT-generated products is presented. Price lists and the revised LANDSAT-4 and -5 coverage map are included.
    Keywords: EARTH RESOURCES AND REMOTE SENSING
    Type: E85-10097 , NASA-CR-175612 , NAS 1.26:175612 , INPE-3323-PRE/623 , LANDSAT Ground Station Operators Working Group and LGWOWG Data Distribution and Marketing Working Group Meetings; Oct 01, 1984 - Nov 01, 1984; Sao Jose dos Campos; Brazil
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