NDLI: Optimization of multiple continuous queries over streaming satellite data

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Optimization of multiple continuous queries over streaming satellite data

Content Provider	ACM Digital Library
Author	Gertz, Michael Hart, Quinn
Abstract	Remotely sensed data, in particular satellite imagery, play many important roles in environmental applications. In particular applications that study rapid changes in the environment require frequent access to these data. For continuous data products, users are often interested in formulating continuous queries that deliver results for each incoming image. In the presence of multiple continuous queries, there is clearly an opportunity to share common intermediate data and thus, increase the overall processing speed of the system.Based on the widely used GRASS, this paper describes a system that realizes multiple query processing using two major components. A query optimizer maintains the current set of active continuous queries. Queries are organized into a single processing plan designed to share intermediate results. For each new image from the stream, the optimizer generates an execution plan specific to the active queries. The query executor then rewrites this plan into a set of geospatial processing steps and executes the plan.We detail experiments using data from NOAA's GOES. Continuous queries are defined in a way similar to the OGC WMS query specification. Using predicted query patterns over the visible hemisphere of GOES, experimental results indicate that multiple-query optimized plans can improve performance significantly when compared to queries that are executed separately.
Starting Page	243
Ending Page	250
Page Count	8
File Format	PDF
ISBN	1595935290
DOI	10.1145/1183471.1183511
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2006-11-10
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Gis Remotely sensed imagery (rsi) Query optimization
Content Type	Text
Resource Type	Article

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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