Query evaluation on efficiently encoded GML streams

Jie Yan; Jinyun Fang; Chengde Han

doi:10.1117/12.812529

3 November 2008 Query evaluation on efficiently encoded GML streams

Jie Yan, Jinyun Fang, Chengde Han

Proceedings Volume 7143, Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Geo-Simulation and Virtual GIS Environments; 714308 (2008) https://doi.org/10.1117/12.812529
Event: Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Geo-Simulation and Virtual GIS Environments, 2008, Guangzhou, China

Abstract

We consider the growing need for querying GML stream and the bulkiness of textual GML. To get things better, we firstly analyze the applicability of Efficient XML Interchange (EXI) encoding for GML and propose EXI encoded GML. Then we develop the SITPath query language supporting geospatial data types and some rich characteristics inherited from XPath within the constraints of streaming limitation. We subsequently present the streaming query evaluation algorithm and some main parts of EGQ engine that evaluates SITPath queries on EXI encoded GML without decoding in advance. Finally, the experimental results indicate the practical time and space performance advantages of EGQ brought about by the query evaluation algorithm and EXI encoding.

Citation Download Citation

Jie Yan, Jinyun Fang, and Chengde Han "Query evaluation on efficiently encoded GML streams", Proc. SPIE 7143, Geoinformatics 2008 and Joint Conference on GIS and Built Environment: Geo-Simulation and Virtual GIS Environments, 714308 (3 November 2008); https://doi.org/10.1117/12.812529

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