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  • 1
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    ECHO Responds to NASA's Earth Science User Community (2001)
    In:  CASI
    Details
    Publication Date: 2013-08-29
    Description: Over the past decade NASA has designed, built, evolved, and operated the Earth Observing System Data and Information System (EOSDIS) Information Management System (IMS) in order to provide user access to NASA's Earth Science data holdings. During this time revolutionary advances in technology have driven changes in NASA's approach to providing an IMS service. This paper will describe NASA's strategic planning and approach to build and evolve the EOSDIS IMS and to serve the evolving needs of NASA's Earth Science community. It discusses the original strategic plan and how lessons learned help to form a new plan, a new approach and a new system. It discusses the original technologies and how they have evolved to today.
    Keywords: Earth Resources and Remote Sensing
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    NASA TECHNICAL REPORTS
  • 2
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    The NPOESS Preparatory Project Science Data Segment: Brief Overview (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The NPOESS Preparatory Project (NPP) provides remotely-sensed land, ocean, atmospheric, ozone, and sounder data that will serve the meteorological and global climate change scientific communities while also providing risk reduction for the National Polar-orbiting Operational Environmental Satellite System (NPOESS), the U.S. Government s future low-Earth orbiting satellite system monitoring global weather and environmental conditions. NPOESS and NPP are a new era, not only because the sensors will provide unprecedented quality and volume of data but also because it is a joint mission of three federal agencies, NASA, NOAA, and DoD. NASA's primary science role in NPP is to independently assess the quality of the NPP science and environmental data records. Such assessment is critical for making NPOESS products the best that they can be for operational use and ultimately for climate studies. The Science Data Segment (SDS) supports science assessment by assuring the timely provision of NPP data to NASA s science teams organized by climate measurement themes. The SDS breaks down into nine major elements, an input element that receives data from the operational agencies and acts as a buffer, a calibration analysis element, five elements devoted to measurement based quality assessment, an element used to test algorithmic improvements, and an element that provides overall science direction. This paper will describe how the NPP SDS will leverage on NASA experience to provide a mission-reliable research capability for science assessment of NPP derived measurements.
    Keywords: Meteorology and Climatology
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  • 3
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    Converting from XML to HDF-EOS (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A computer program recreates an HDF-EOS file from an Extensible Markup Language (XML) representation of the contents of that file. This program is one of two programs written to enable testing of the schemas described in the immediately preceding article to determine whether the schemas capture all details of HDF-EOS files.
    Keywords: Documentation and Information Science
    Type: GSC-15017-1 , NASA Tech Briefs, December 2008; 18
    Format: application/pdf
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  • 4
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    Using NASA's Reference Architecture: Comparing Polar and Geostationary Data Processing Systems (2013)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The JPSS and GOES-R programs are housed at NASA GSFC and jointly implemented by NASA and NOAA to NOAA requirements. NASA's role in the JPSS Ground System is to develop and deploy the system according to NOAA requirements. NASA's role in the GOES-R ground segment is to provide Systems Engineering expertise and oversight for NOAA's development and deployment of the system. NASA's Earth Science Data Systems Reference Architecture is a document developed by NASA's Earth Science Data Systems Standards Process Group that describes a NASA Earth Observing Mission Ground system as a generic abstraction. The authors work within the respective ground segment projects and are also separately contributors to the Reference Architecture document. Opinions expressed are the author's only and are not NOAA, NASA or the Ground Projects' official positions.
    Keywords: Ground Support Systems and Facilities (Space)
    Type: GSFC.OVPR.7508.2012 , 93rd American Meteorological Society Annual Meeting; Jan 05, 2013 - Jan 10, 2013; Austin, TX; United States
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    NASA TECHNICAL REPORTS
  • 5
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    NASA's Earth Science Data Systems Standards Process Experiences (2007)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: NASA has impaneled several internal working groups to provide recommendations to NASA management on ways to evolve and improve Earth Science Data Systems. One of these working groups is the Standards Process Group (SPC). The SPG is drawn from NASA-funded Earth Science Data Systems stakeholders, and it directs a process of community review and evaluation of proposed NASA standards. The working group's goal is to promote interoperability and interuse of NASA Earth Science data through broader use of standards that have proven implementation and operational benefit to NASA Earth science by facilitating the NASA management endorsement of proposed standards. The SPC now has two years of experience with this approach to identification of standards. We will discuss real examples of the different types of candidate standards that have been proposed to NASA's Standards Process Group such as OPeNDAP's Data Access Protocol, the Hierarchical Data Format, and Open Geospatial Consortium's Web Map Server. Each of the three types of proposals requires a different sort of criteria for understanding the broad concepts of "proven implementation" and "operational benefit" in the context of NASA Earth Science data systems. We will discuss how our Standards Process has evolved with our experiences with the three candidate standards.
    Keywords: Earth Resources and Remote Sensing
    Type: IGARSS 2007; Jul 23, 2007 - Jul 27, 2007; Barcelona; Spain
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    NASA TECHNICAL REPORTS
  • 6
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    HDF-EOS 2 and HDF-EOS 5 Compatibility Library (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: The HDF-EOS 2 and HDF-EOS 5 Compatibility Library contains C-language functions that provide uniform access to HDF-EOS 2 and HDF-EOS 5 files through one set of application programming interface (API) calls. ("HDFEOS 2" and "HDF-EOS 5" are defined in the immediately preceding article.) Without this library, differences between the APIs of HDF-EOS 2 and HDF-EOS 5 would necessitate writing of different programs to cover HDF-EOS 2 and HDF-EOS 5. The API associated with this library is denoted "he25." For nearly every HDF-EOS 5 API call, there is a corresponding he25 API call. If a file in question is in the HDF-EOS 5 format, the code reverts to the corresponding HDF-EOS 5 call; if the file is in the HDF-EOS 2 format, the code translates the arguments to HDF-EOS 2 equivalents (if necessary), calls the HDFEOS 2 call, and retranslates the results back to HDF-EOS 5 (if necessary).
    Keywords: Computer Programming and Software
    Type: GSC-15008-1 , NASA Tech Briefs, December 2008; 17
    Format: application/pdf
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  • 7
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    HDF-EOS Web Server (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A shell script has been written as a means of automatically making HDF-EOS-formatted data sets available via the World Wide Web. ("HDF-EOS" and variants thereof are defined in the first of the two immediately preceding articles.) The shell script chains together some software tools developed by the Data Usability Group at Goddard Space Flight Center to perform the following actions: Extract metadata in Object Definition Language (ODL) from an HDF-EOS file, Convert the metadata from ODL to Extensible Markup Language (XML), Reformat the XML metadata into human-readable Hypertext Markup Language (HTML), Publish the HTML metadata and the original HDF-EOS file to a Web server and an Open-source Project for a Network Data Access Protocol (OPeN-DAP) server computer, and Reformat the XML metadata and submit the resulting file to the EOS Clearinghouse, which is a Web-based metadata clearinghouse that facilitates searching for, and exchange of, Earth-Science data.
    Keywords: Computer Programming and Software
    Type: GSC-15011-1 , NASA Tech Briefs, December 2008; 17
    Format: application/pdf
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  • 8
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    Converting EOS Data from HDF-EOS to netCDF (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A C-language computer program accepts, as input, a set of scientific data and metadata from an Earth Observing System (EOS) satellite and converts the set from (1) the format in which it was created and delivered to (2) another format for processing and exchange of data on Earth.
    Keywords: Computer Programming and Software
    Type: GSC-15007-1 , NASA Tech Briefs, December 2008; 17
    Format: application/pdf
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  • 9
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    HDF-EOS 5 Validator (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: A computer program partly automates the task of determining whether an HDF-EOS 5 file is valid in that it conforms to specifications for such characteristics as attribute names, dimensionality of data products, and ranges of legal data values. ["HDF-EOS" and variants thereof are defined in "Converting EOS Data From HDF-EOS to netCDF" (GSC-15007-1), which is the first of several preceding articles in this issue of NASA Tech Briefs.] Previously, validity of a file was determined in a tedious and error-prone process in which a person examined human-readable dumps of data-file-format information. The present software helps a user to encode the specifications for an HDFEOS 5 file, and then inspects the file for conformity with the specifications: First, the user writes the specifications in Extensible Markup Language (XML) by use of a document type definition (DTD) that is part of the program. Next, the portion of the program (denoted the validator) that performs the inspection is executed, using, as inputs, the specifications in XML and the HDF-EOS 5 file to be validated. Finally, the user examines the output of the validator.
    Keywords: Computer Programming and Software
    Type: GSC-15015-1 , NASA Tech Briefs, December 2008; 17
    Format: application/pdf
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  • 10
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    XML DTD and Schemas for HDF-EOS (2008)
    In:  CASI
    Details
    Publication Date: 2019-07-12
    Description: An Extensible Markup Language (XML) document type definition (DTD) standard for the structure and contents of HDF-EOS files and their contents, and an equivalent standard in the form of schemas, have been developed.
    Keywords: Documentation and Information Science
    Type: GSC-15016-1 , NASA Tech Briefs, December 2008; 17-18
    Format: application/pdf
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