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From page 35... ... Such involvement will Data Management and Computation, Volume 1: Issues and Recommendations; Committee on Data Management and Computation, Space Science Board, NRC; National Academy Press, Washington, D.C.; 1982. Read the entire page →
From page 36... ... One example is the initiation by the ISO of the pilot data systems, which directly involved the science community. However, CODMAC also noted its concern that neither NASA nor the space science community seem to be postured "to efficiently implement geographically distributed information systems..." It observed that NASA and the science community, with strong leadership from NASA, "need to work together to achieve the common goad -- to maximize the scientific return from space science data." To this end, CODMAC recommended that NASA estabJish a high-level advisory group, consisting of experienced data users (scientists) Read the entire page →
From page 37... ... Secondary users usually receive data from an archive. Also: Primary users become secondary users when they want to use data from an instrument other than the one with which they are associated. Read the entire page →
From page 38... ... OSSA-User Interaction. During this study, the Committee reviewed background material and documentation pertaining to several missions planned for the 199Os involving astronomy and astrophysics, planetary sciences, solar terrestrial physics, atmospheric sciences, and land resource sciences. Read the entire page →
From page 39... ... NASA mailed out copies of these tapes to 70 users. Many satellite data sets will be used by a few people (perhaps i-10) Read the entire page →
From page 40... ... Such tradeoffs and compromises are cheapest if they are worked out during the mission planning stage, rather than later. Through its briefings from NASA officials, the Committee also learned of several initiatives within OSSA's domain to find common elements in satellite data systems, so that generic systems could be designed for use on such missions. Read the entire page →
From page 41... ... technologies cannot cope with anticipated data rates in the Space Station era. Further, commercial database management systems currently do not have the features required to manage large volumes of space-derived data. Read the entire page →
From page 42... ... read-only memory (ROM) technologies to cope with anticipated data rates in the Space Station era in support of on-board processing, space-to-ground transmission, "1eve1-zero" processing (that is, data that have been corrected for telemetry errors and decommutated) Read the entire page →
From page 43... ... The international processing unit at the Goddard Institute for Space Studies is able to process the smaller of these two archives to derive cloud statistics. While the above data rate of 60 x 1012 bits per year has posed a difficult problem for long-term studies, it should be noted that the composite data rate being planned by NASA for 1995 is more than 50 times greater (see Figure 7~. Read the entire page →
From page 44... ... Technologies. Even with efficient data-rate management and control, the current digital magnetic recording and CD-ROM technologies cannot cope with anticipated data rates in the Space Station era. Read the entire page →
From page 45... ... Processing speeds of 100 MIPS to handle level-zero processing, as well as storage requirements of over 100,000 PSUs per year, present some major problems using projections of current technology. Data rates of the order of 108 bps present possibly insurmountable problems and challenges. Read the entire page →
From page 46... ... Once successful algorithms are applied to the outputs of high-data-rate sensors, the resulting reduced data rates can be handled with existing technology. The development and application of data-compression techniques should be coordinated carefully with the user community, which traditionally takes the view that nobody should "mess around" with the data. Read the entire page →
From page 47... ... However, while commercially available DBMSs will provide a comprehensive set of data management facilities, there remain a number of areas in which these systems fall short of meeting the needs of the engineering and scientific communities for management of large volumes of space-derived data. In conjunction with NOAA, NSF, and the community of vendors and standards organizations, NASA/OSSA should focus on this shortcoming, and encourage the private sector and the standards organizations to develop appropriate solutions. Read the entire page →
From page 48... ... wild be a key factor in achieving systems interoperability. User requirements for both directory content and directory management should be gathered, analyzed, and submitted to vendors and appropriate standards organizations for consideration and adoption. Read the entire page →
From page 49... ... PEAK DATA RATE TIME PROFI LE 1.1 1.0 0.9 on as Cal 3 o ~ 0.6 a: A: n 0.8 0.7 0.5 0.4 0.3 0.2 0.1 O I L// ; AudioMdeo Telemetry ~ ~, ~ 1992 1993 /~/~ 1 994 1995 YEAR FI CURE 5 49 1996 1~ .;, Read the entire page →
From page 51... ... DAI LY DATA VOLUME TI ME PRO FI L E 4.0 3.5 On 3.0 m t o 2.5 2.0 At: 1.5 o 1.0 0.5 o ~///~3 Audio/V'deo Tel~W 1992 1993 1994 1995 1996 1997 1998 YEAR FI CURE 7 51 :... Read the entire page →
From page 52... ... - ~ lo ~ lo lo Jo lo lo lo ~ lo lo lo =-o lo lo ~ ~ - - To CS) Read the entire page →
From page 53... ... No. Report of the Eos Data Panel (NASA Technical Memorandum 87777, Volume Ila) Read the entire page →
From page 54... ... International Standards Organization Jet Propulsion Laboratory (NASA) Ki~obits per second Megabits per second Megahertz Million Instructions per second Mu~tispectra] Read the entire page →
From page 55... ... Pilot Climate Data System Planetary Data System Principal Investigator Pilot Land Data System Pilot Ocean Data System Program Support Communications Network (NASA) Physical Storage Unit Research and Development Request for Proposal Read-Only Memory Science and Applications Information System Synthetic Aperture Radar Space Physics Applications Network Space Science Board (NRC) Read the entire page →

From page 35...

... Such involvement will Data Management and Computation, Volume 1: Issues and Recommendations; Committee on Data Management and Computation, Space Science Board, NRC; National Academy Press, Washington, D.C.; 1982.