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  • DOCUMENTATION AND INFORMATION SCIENCE  (6)
  • 2020-2022
  • 2005-2009
  • 1990-1994  (6)
  • 1993  (5)
  • 1990  (1)
  • 1
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    Materials And Processes Technical Information System (MAPTIS) LDEF materials data base (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: A preliminary Long Duration Exposure Facility (LDEF) Materials Data Base was developed by the LDEF Materials Special Investigation Group (MSIG). The LDEF Materials Data Base is envisioned to eventually contain the wide variety and vast quantity of materials data generated from LDEF. The data is searchable by optical, thermal, and mechanical properties, exposure parameters (such as atomic oxygen flux) and author(s) or principal investigator(s). Tne LDEF Materials Data Base was incorporated into the Materials and Processes Technical Information System (MAPTIS). MAPTIS is a collection of materials data which has been computerized and is available to engineers, designers, and researchers in the aerospace community involved in the design and development of spacecraft and related hardware. The LDEF Materials Data Base is described and step-by-step example searches using the data base are included. Information on how to become an authorized user of the system is included.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: LDEF: 69 Months in Space. Part 3: Second Post-Retrieval Symposium; p 1201-1222
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    The development of a natural language interface to a geographical information system (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper will discuss a two and a half year long project undertaken to develop an English-language interface for the geographical information system GRASS. The work was carried out for NASA by a small business, Netrologic, based in San Diego, California, under Phase 1 and 2 Small Business Innovative Research contracts. We consider here the potential value of this system whose current functionality addresses numerical, categorical and boolean raster layers and includes the display of point sets defined by constraints on one or more layers, answers yes/no and numerical questions, and creates statistical reports. It also handles complex queries and lexical ambiguities, and allows temporarily switching to UNIX or GRASS.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA, Washington, Technology 2002: The Third National Technology Transfer Conference and Exposition, Volume 2; p 29-42
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    NCDC mass storage systems and technologies (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: National Climatic Data Center (NCDC) data management issues are discussed, such as nature of holdings, history of the site, popularity of data sets, media/technology used for storage, volume distributed per month, mode of distribution, most frequently encountered problems, type of media requested/used, and evolution of media. Current holdings at NCDC are 107.8 terabytes of digital data and about 0.3 terabytes of manuscript data. The nexrad radar system is expected to generate approximately 88 terabytes per year by 1996.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: NASA. Goddard Space Flight Center, The Third NASA Goddard Conference on Mass Storage Systems and Technologies; p 121-124
    Format: application/pdf
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  • 4
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    A reference model for scientific information interchange (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: This paper presents an overview of an Information Interchange Reference Model (IIRM) currently being developed by individuals participating in the Consultative Committee for Space Data Systems (CCSDS) Panel 2, the Planetary Data Systems (PDS), and the Committee on Earth Observing Satellites (CEOS). This is an ongoing research activity and is not an official position by these bodies. This reference model provides a framework for describing and assessing current and proposed methodologies for information interchange within and among the space agencies. It is hoped that this model will improve interoperability between the various methodologies. As such, this model attempts to address key information interchange issues as seen by the producers and users of space-related data and to put them into a coherent framework. Information is understood as the knowledge (e.g., the scientific content) represented by data. Therefore, concern is not primarily on mechanisms for transferring data from user to user (e.g., compact disk read-only memory (CD-ROM), wide-area networks, optical tape, and so forth) but on how information is encoded as data and how the information content is maintained with minimal loss or distortion during transmittal. The model assumes open systems, which means that the protocols or methods used should be fully described and the descriptions publicly available. Ideally these protocols are promoted by recognized standards organizations using processes that permit involvement by those most likely to be affected, thereby enhancing the protocol's stability and the likelihood of wide support.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: The Third NASA Goddard Conference on Mass Storage Systems and Technologies; p 75-97
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    NASA TECHNICAL REPORTS
  • 5
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    LDEF materials special investigation group's data bases (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: The Long Duration Exposure Facility (LDEF) was composed of and contained a wide array of materials, representing the largest collection of materials flown for space exposure and returned for ground-based analyses to date. The results and implications of the data from these materials are the foundation on which future space missions will be built. The LDEF Materials Special Investigation Group (MSIG) has been tasked with establishing and developing data bases to document these materials and their performance to assure not only that the data are archived for future generations but also that the data are available to the space user community in an easily accessed, user-friendly form. The format and content of the data bases developed or being developed to accomplish this task are discussed. The hardware and software requirements for each of the three data bases are discussed along with current availability of the data bases.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: LDEF Materials Results for Spacecraft Applications; p 371-376
    Format: application/pdf
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  • 6
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    Information analysis of a spatial database for ecological land classification (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: An ecological land classification was developed for a complex region in southern California using geographic information system techniques of map overlay and contingency table analysis. Land classes were identified by mutual information analysis of vegetation pattern in relation to other mapped environmental variables. The analysis was weakened by map errors, especially errors in the digital elevation data. Nevertheless, the resulting land classification was ecologically reasonable and performed well when tested with higher quality data from the region.
    Keywords: DOCUMENTATION AND INFORMATION SCIENCE
    Type: Photogrammetric Engineering and Remote Sensing (ISSN 0099-1112); 56; 605-613
    Format: text
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    NASA TECHNICAL REPORTS
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