Abstract
Web services and web service composition technology have become the primary methods to realize geospatial information sharing and interoperability. There are various integration models and many specifications for web services composition, BPEL4WS is the most typical and prevailing one. But BPEL4WS is IT-oriented, the syntax structure is complicated, a well understanding to XML specifications and web services specifications is demanded, the way to describe processes and define activities in BPEL4WS are different from ways in certain domain, service contracts need early binding before the process instance execution. For above reasons, BPEL4WS is not suit for geospatial processing process's visual modeling. In this paper, an abstract geospatial service chain model based on data-dependent relationship is designed. A mapping algorithm is also proposed for translating the abstract service chain model into BPEL4WS form. So geospatial experts who are not web services experts can intuitively modeling service chain, translate the model into BPEL4WS style and execute it using BPEL4WS engine. Based on these researches, a geospatial web service chain visual modeling platform prototype is built, aiming to meet modeling demand of geospatial domain experts and common users.
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