A High Precision OGC Web Map Service Retrieval Based on Capability Aware Spatial Search Engine

Abstract

Recent advances in open geospatial web service, such as Web Map Service as well as corresponding web ready data processing service, have led to the generation of large amounts of OGC enabled links on Internet. How to find the correct spatial aware web service in a heterogeneous distributed environment with some special criteria, such as coincidence of type, version, time, space and scale has become a "bottleneck" of geospatial web-based applications. In order to improve the accessing precision of OGC Web Map Service (WMS) on WWW, a new methodology for retrieving WMS based on extended search engine and service capability match is put forward in this paper. Major components include the WMS search engine, WMS ontology generator, WMS catalogue service and multi protocol WMS client. Here we proposed the architecture and interaction between these components before focusing on the service capability match and design of the WMS ontology. The process of WMS link detection, capability matching, ontology modeling, and automatic registry are reported in this paper. Then the precision and response time of WMS retrieval is evaluated, results show that the mean execution time during per effective hit of proposed method is 0.44 times than that of traditional method, moreover, the precision is about 10 times than that of traditional method. WMS ontology record could be generated by ontology reasoning, registered and served by CSW.