The research on QoS assessment and optimization for geospatial service chain
Zhipeng Gui, Huayi Wu, Wei Liu, Yumin Chen · 2009
User experience and satisfaction of Web services and service chain are majorly determined by the quality of services (QoS), which is critical to services selection. Geo-data services and processing services are two fundamental services types of geo-services, where geo-data services provide geo-data, and processing services process and produce data. Therefore, the data quality of geo-data provided by geo-data services and the capabilities of geo-data processing to processing services are inherent characteristics and key quality factors of those geoservices. In this paper, the output quality factors are introduced to cope with above-mentioned characteristics of geo-services. Coupling with process quality factors (common measurement quality factors of Web services), a preliminary QoS assessment model for geo-services is proposed. The dynamic feature and the aggregation functions of QoS factors are discussed. Finally, a services instances' optimization selection algorithm based on linear programming is designed.