Design and Evaluation of Experiment Methods for Improving Performance In GIS Web Services 1)

By introducing Web Services, distributed GIS(Geospatial Information System) services from different vendors can be dynamically integrated into a GIS application using the interoperable standard SOAP(Simple Object Access Protocol). However, it is debatable whether SOAP can really meet the performance requirement of GIS. Additionally, GIS Web Services’ performance may be improved by using asynchronous technique. Ajax, one of the technologies of “Web 2.0”. Integrating Ajax(Asynchronous JavaScript and XML) approach into GIS visualization Web Services have performance enhancement, because it provides more interactive user experience. This paper presents an experimental evaluation of the performance of different SOAP variants: standard SOAP, SwA/MIME, and SOAP/MTOM. SOAP/MTOM is proved to be the fastest and the most efficient messaging protocol. For sintegrating Ajax approach, compare performance of models between Web Services and Web Services using Ajax. This comparison results that Web Services using Ajax represent good performance in images fetching and user roundtrip time because it fetches required images beforehand.

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