Systems for data processing, anaylsis and representation

Allam, Mosaad; Plunkett, Gordon

Bibliographic data

Monograph

Persistent identifier:: 1067490280

Title:: Systems for data processing, anaylsis and representation

Sub title:: ISPRS Commission II Symposium : June 6 - 10, Ottawa, Canada

Scope:: 1 Online-Ressource (XX, 530 Seiten)

Year of publication:: 1994

Place of publication:: Ottawa

Publisher of the original:: The Surveys, Mapping and Remote Sensing, Natural Resources Canada

Identifier (digital):: 1067490280

Illustration:: Illustrationen

Signature of the source:: ZS 312(30,2)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Editor:: Allam, Mosaad; Plunkett, Gordon

Corporations:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Adapter:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Founder of work:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Other corporate:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Monograph

Collection:: Earth sciences

Chapter

Title:: [Wednesday, June 8, 1994]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: [Session F-2 WG II/3 - Technologies for Large-Volumes of Spatial Data - Part B]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: SATELLITE DATA MANAGEMENT AND DISSEMINATION AT THE U.S. GEOLOGICAL SURVEY EROS DATA CENTER Lyndon R. Oleson and Thomas M. Holm [...] Darla J. Werner [...]

Document type:: Monograph

Structure type:: Chapter

auspices of the NASA EOS Program in cooperation with the USGS, NOAA, the European Space Agency, and a worldwide network of AVHRR ground reception and data processing facilities. The primary objective of the project is to obtain complete 1-year coverage of all the land surfaces of the globe with 1-km AVHRR sensor data serving as a precursor data set for EOS investigators involved in the development of scientific algorithms and models. One of the products being derived from the Global Land 1-km AVHRR Data Set is a 10-day global vegetation index composite that will allow scientists to experiment with vegetation index information on a global scale at the 1-km resolution. At full resolution, a single 10-day composite product represents 10 GB of data. The media being used to distribute these composites are 8-mm high-density cassette tapes. This medium was chosen because it required the fewest tapes and the least amount of operator involvement (see table 1). The time estimates provided in table 1 include computer write time only and do not include time for operator tasks such as tape mounting and dismounting and tape labeling. Therefore, even though the wall-clock time required to write a 10-GB composite to 8-mm high-density cassettes was 3 hours more than the time required to write the same composite to write- once compact disk (CD), it would be significantly more expensive operationally to handle and disseminate the 15 CD's. Also, it was felt that the users would prefer having a significantly smaller number of media. Network delivery of a complete 10-GB composite is not a practical alternative. For example, assuming that a remote user has a moderately robust connection to the Internet (25-50 kilobytes per second), it is estimated that it could take from 2.3 to 4.6 days to transfer a full 10-GB composite. This scenario further assumes that the computer systems and network connections at both ends remain up throughout the period and that sufficient disk storage capacity is available to hold the data without operator intervention. Assuming that most users would seldom require complete 10-day composites but would be interested in smaller geographic regions from one or more 10-day composites, the Center is exploring the use of data subsetting and compression techniques to provide a more effective network data delivery alternative. The Center is developing a capability for users to select, for network transfer, a geographic subset of a 10-day composite at a resolution of from 1-16 km. The selection would be done through a graphical user interface accessed by means of the EOS Data and Information System's interactive data query and order system, the Information Management System. A prototype of this capability should be available for demonstration and science-user feedback in July 1994, with a fully operational capability planned for October 1994. 7. SUMMARY The EROS Data Center holds the world's largest collection of satellite- and aircraft-acquired images of the Earth's land surface, including more than 3 million Table 1: Media options for 10-GB composite product. Media Type Capacity | Number . Write - Time 6250 bpi 9-track .16 GB 63 16 hrs. 3480 cassette .30 GB 34 9 hrs. CD Write Once (6x) .68 GB 15 3 hrs. 4mm cassette 2.0 GB 5 15 hrs. 8mm cassette (low) 2.3 GB 5 15 hrs. 8mm cassette (high) 5.0 GB 2 6 hrs. satellite images and more than 7 million aerial photographs. In its role as the National Satellite Land Remote Sensing Data Archive, the Center is exploiting new technologies to ensure the long-term availability of these data. The Center is converting its Landsat MSS and TM satellite data from high-density instrumentation tapes to DCRSI cassette tapes. In conjunction with the media conversion effort, the Center has successfully recovered more than 15,000 Landsat scenes from nearly 700 archive tapes affected by hydrolysis. This recovery was accomplished by applying low levels of heat to the tapes to effect a temporary reversal of the hydrolysis. The Center is also investigating and implementing new techniques to improve the quality and accessibility of products and services. For example, the Landsat media conversion effort is providing the opportunity to assess the overall quality of the Landsat archive data and metadata and to collect digital browse images for user viewing through state-of-the-art information systems, such as GLIS. In preparation for its role as an EOS data archive, processing, and distribution facility, the Center is participating in early prelaunch activities to enhance the availability and utility of existing Earth science data. As part of these activities, the Center is exploring the use of data subsetting and compression techniques to provide an effective network data delivery capability for the 10-day global vegetation index composite products. SELECTED REFERENCES Cuddihy, E.F., 1980. The Aging of Magnetic Recording Tape. IEEE Transactions on Magnetics. Volume 16, Number 4, July 1980, p. 558. Cuddihy, E.F., 1976. Hygroscopic Properties of Magnetic Recording Tape. IEEE Transactions on Magnetics. Volume 12, Number 2, March 1976, p. 126-135. DeLancie, P., 1990. Sticky Shed Syndrome: Tips On Saving Your Damaged Master Tapes. In: Mix Magazine, May 1990, p. 148-152. Holm, T.M., W.C. Draeger, R.R. Risty, 1993. Availability of Earth Observations Data From The 232 U.S. Pecc Spac Aug. Ame Sens Moulats Amp Oleson, Syst Syst Proc Conf Solving 199: Med Vol. Werner, Map Com Lanc Falls Falls Phot

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