Review of NASA's Distributed Active Archive Centers (1999) / Chapter Skim
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1 Introduction
1 Introduction
Pages 9-26
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From page 9... ...
. EOSDIS itself is an ambitious endeavor, not only because it must deal with data volumes and acquisition rates that are several orders of magnitude larger than ever before in the earth sciences, but also because its stated goal is to permit seamless access to multidisciplinary data in a timely manner.
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From page 10... ...
The DAACs reviewed are located at the Goddard Space Flight Center (GSFC) , Langley Research Center (LaRC)
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Their primary roles, which are discussed in more detail below, are as follows: · the ECS contractor builds the information system to capture and process data, and link the DAACs together; · instrument and science teams develop algorithms for processing data and generate data products; · DAACs process and disseminate data and provide user services; and · the ESDIS Project sets the requirements for the information system and coordinates the DAAC system. An organization chart, with the reporting lines within EOSDIS is shown in Figure 1.2.
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From page 13... ...
For example, the DAACs worked collectively to implement Version 0 of EOSDIS, which permits users to browse the holdings of all the DAACs, although not in a seamless or transparent manner. Instrument interdependencies, which require data products to be transferred between and distributed by several DAACs (e.g., Moderate Resolution Imaging Spectroradiometer [MODIS]
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From page 15... ...
Geological Survey GSFC DAAC Goddard Space Flight Center NASA Upper atmosphere, atmospheric dynamics, global biosphere, hydrologic processes LaRC DAAC Langley Research Center Radiation budget, aerosols, NASA tropospheric chemistry NSIDC DAAC National Snow and Ice Data Center University of Colorado ORNL DAAC Oak Ridge National Laboratory Department of Energy Snow and ice, cryosphere Biogeochemical fluxes and processes PO.DAAC Jet Propulsion Laboratory Ocean circulation, air-sea NASA-Caltech interaction SEDAC CIESIN Socioeconomic data and Columbia University applications and the most ECS-supplied hardware, software, and personnel (Table 1.3~. DAACs that will receive data mainly from later missions (e.g., PO.DAAC and NSIDC)
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From page 16... ...
StaffHoldings AM-1 DAAC1997a FY 1994-2002b FY 1998C(TB) Instruments ASF 400 DAAC: 6.0 DAAC: 65 110 None foreign JPLd: 6.6 ECS: 1 spacecraft: ERS-1,2; ECS: 0.6 JERS-1; RADARSAT EDC 1,156 DAAC: 5.6 DAAC: 72 9 Landsat 7, ASTER, ECS: 5.0 ECS: 38 MODIS GSFC 12,216 DAAC: 5.1 DAAC: 74 4 TRMM, MODIS ECS: 10.2 ECS: 40 LaRC 804 DAAC: 7.2 DAAC: 84 3 CERES/TRMM, ECS: 3.6 ECS: 6 CERES/AM-1, MISR, MOPITT NSIDC 506 DAAC: 3.1 DAAC: 27 1 MODIS ECS: 1.1 ECS: 6 ORNL 1,143 DAAC: 2.2 DAAC: 14 6-7 GB None data are ECS: 0.1 ECS: 1 mostly field based PO.DAAC 15,527 DAAC: 4.6 DAAC: 28 15 None US-foreign ECS: 0.8 ECS: 1 collaborative missions: AMSR, SeaWinds, Jason NOTE: AMSR = Advanced Microwave Scanning Radiometer; ASTER = Advanced Spaceborne Thermal Emission and Reflection Radiometer; CERES = Clouds and the Earth's Radiant Energy System; ERS = European Remote Sensing Satellite; JERS = Japanese Earth Remote-Sensing Satellite; MISR = Multi-angle Imaging Spectroradiometer; MOPITT = Measurements of Pollution in the Troposphere; TRMM = Tropical Rainfall Measuring Mission.
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From page 17... ...
The performance requirements were developed in consultation with the DAACs, the EOSDIS Panel, and the Mission to Planet Earth Program Office (now part of the Earth Science Enterprise)
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To test these concepts, the DAACs participated in two key prototype exercises the Pathfinder Program and EOSDIS Version 0. Pathfinder data sets were developed by science teams to support global change research and to gain experience in reprocessing and transferring massive data sets in the pre-EOS era.
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In 1998, NASA initiated a prototype federation with participation by three types of Earth Science Information Partners (ESIPs)
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From page 23... ...
Further change, particularly in the EOSDIS Core System, is likely to occur as the system approaches operational readiness. Delays in the ECS led NASA's 1997 Biennial Review Committee to recommend stronger managerial oversight of the ECS, the creation of backup plans, and a reduction in the data requirements for EOSDIS (Indepen
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The backup systems developed by the DAACs rely on Version 0 and their own home-grown information systems to process the data. On the other hand, backup plans developed by the science and instrument teams mostly call for the data to be processed at the Science Computing Facilities, where the algorithms were developed and where the interdisciplinary science teams will eventually analyze the data.
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From page 25... ...
The committee solicited input from the broader community by conducting a user survey. The survey was e-mailed to the Investigator Working Group list, which includes nearly 1,000 individuals associated with EOSDIS and the Earth Science Enterprise, including instrument and science teams, program managers, and NASA advisory panels.
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