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:: [Monday, June 6, 1994]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: [Session B-1 WG II/3 - Technologies for Large Volumes of Spatial Data - Part A]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: DEFINING THE ARCHITECTURAL DEVELOPMENT OF EOSDIS TO FACILITATE EXTENSION TO A WIDER DATA INFORMATION SYSTEM Mark Elkington, Richard Meyer and Gail McConaughy

Document type:: Monograph

Structure type:: Chapter

nd salinity. In this case ble to provide a software imically linked into the | completely specialized fic service/provider. y, objects resulting from able of initiating further e a search of an image | results object which natching the query and a would enable a user to > service and review the of the inventory records. JES/APPROACH t described here offers ne future development of providers have complete /ish to organize data into IS provided type services ecide to create their own ch and retrieval service to replace all data types 1anagement system (and research projects and ' object databases are in 1e lifetime of the global Rowe, 1986; Haas et al., he inclusion of legacy ite is only required to iishes to support in the | minimum set of services mple, a site may only be insfer, but would still be 1 open ended approach to ieval. Searches can be rsite search service, local the level of the data type | be negotiated among e protocols themselves. n of results of ongoing and schema translation, uages might be adaptable Jille and Miller, 1993; iture search engines may telligent searching using arth science community, ertise "knowledge" about xes (Smith et al., 1989). no principal distinction science metadata (e.g., ween metadata and data. 1 GCDIS and UserDIS ns may very well have s. The widely differing s also will likely lead to index, what is data, and onable time. Despite this hat searches on multiple be compared effectively by the user, and thus the query process will include mechanisms to ensure that the user receives the required form of result. The architectural approach shown facilitates the introduction of more powerful search strategies in the future (Hellerstein and Stonebraker, 1993; Haas, 1989). Finally, the concept described above will encourage evolutionary and independent development of system components. By adopting a fully distributed architecture for all components and not mandating the details of the client interface and service implementations, the entire user and development community can participate in the development of components in each of the three layers. For example, computer science research may lead to the development of an improved intersite search agent. Users can then choose whether the new agent provides a ‘better’ service. If it does then, over time, it will make other agents obsolete. Moreover by establishing a conceptual framework which can accommodate the variability of the earth science discipline which can guide rather than constrain development of components, hopefully minimizing the ‘not invented here’ syndrome, it will encourage the development of components and support utilities (e.g. APIs) by the entire community. Although the architectural concept seeks to strike a proper balance between the users' demand for decentralized capabilities and autonomy on one side, and complete anarchy on the other, a network of the type proposed for GCDIS / UserDIS poses significant issues in several system quality areas. For example, the accuracy of search results suffers as incompatibilities among the vocabularies and terms employed by different data providers increases. In an unmanaged network, there can be no expectations regarding service reliability, availability and response time. For example, some sites may respond to a search within seconds or minutes, others may not respond for days because the data provider experiences hardware problems. The solutions to these types of problems are outside the scope of an architecture. They depend on the cooperation of service providers which, in a network like UserDIS, is voluntary. However, the architecture can include measures to facilitate the solutions. For example, EOSDIS will not make a reliable network, in which all sites are always available, a precondition for successful operation. The services will provide feedback which lets users judge the quality of a response (if they so desire). The. architecture will provide mechanisms for characterizing situations where standards or conventions exist and are being followed. As described above there are several areas where the computer science community could contribute solutions to the GCDIS and UserDIS challenges. In each area EOSDIS will need to pick specific technical approaches which are compatible with its implementation time frame, while encouraging the computer science community to seek improved solutions which can replace the baseline approach in the future. 5. SUMMARY The GCDIS / UserDIS concept describes a radical departure from the traditional model of data system. By taking this concept into consideration in its development of EOSDIS, NASA will provide some components of a system in which an open interoperability standard can be used to acquire or provide data and services, enabling an information system to be developed that will operate more as a marketplace with 37 positive competition than as a monolithic, monopoly that focuses on production and storage of data. Such an information system should encourage evolutionary and independent development within a single framework on an inter-agency and international scale. Indeed its success depends on this complementary development. It should also provide more flexibility for accommodation of new user needs and taking advantage of emerging technological developments. Finally, it provides more flexibility to respond to the inevitable change in distribution, prioritization and funding policies over such a long-term undertaking as an earth science information system. ACKNOWLEDGMENTS This work was undertaken as part of Hughes Applied Information Systems contract to NASA for the EOSDIS Core System Project (contract NAS5-6000). Important recommendations which led to the approach described in the paper were received from the National Research Council's review of the EOSDIS plans. REFERENCES Asrar, G. and D. J., Dokken, 1993. EOS Reference Handbook, NASA, March 1993. Haas, L.M., Freytag, J.C., Lohman, G.M., and P. Pirahesh, 1989. "Extensible Query Processing in Starburst," Proceedings of the ACM SIGMOD'89, June 1989. Haas, L.M. et al., 1990. "Starburst Mid Flight: As the Dust Clears," IEEE Transactions on Knowledge and Data Engineering, March 1990. Hellerstein, J.M. and M. Stonebraker, 1993. "Predicate Migration: Optimizing Queries with Expensive Predicates", Proceedings of the ACM SIGMOD '93, June 1993. Lamb, C., Landis G., Orenstein J., and D. Weinreb, 1991. "The ObjectStore database system," Communications of the ACM, Vol 34, Number 10, October 1991. Morrissey, J.M., 1990. "Imprecise Information and Uncertainty in Information Systems," ACM Transactions on Information Systems, Vol 8, No 2, April 1990. NASA, 1994a. GCDIS/UserDIS Study, EOSDIS Core System Project, in preparation. NASA, 1994b. ECS Science Information Architecture, Working Paper FB9401V2, March 1994. Ordille, J., and B. Miller, 1993. "Database Challenges in Global Information Systems," Proceeedings of the ACM SIGMOD'93, June 1993. Smith, P.J., Shute, S.J., and D. Galdes, 1989. "Knowledge- Based Search Tactics for an Intelligent Intermediary System," ACM Transactions on Information Systems, Vol 7, No 3, July 1989. Stonebraker, M. and L. Rowe, 1986; Stonebraker, L. Rowe, "The Design of Postgres", Proceedings of the ACM SIGMOD'86, June 1986.

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