Recursive Partitioning Based Spatial Join Strategy Between OGC´s Web Feature Services

OGC-compliant(OGC, Open Geospatial Consortium Inc.) Web Feature Services (WFSs) have gradually become an important kind of spatial data sources over the Internet. In such a distributed environment, a user may issue a query that relates two spatial datasets that are provided by two services at different sites. Because of the sheer volume and complexity of spatial data, spatial joins between two spatial datasets by different services are expensive in terms of transmission cost. This paper examines the problems of spatial joins between WFSs, based on the spatial semijoin strategy and partition based spatial join strategy, this paper presents a spatial join processing strategy between two OGC-compliant WFSs. The experimental result illustrates that when in the query window there are enough spatial features from the two related datasets, the proposed strategy can greatly reduce the expensive of transmission cost and thus time cost.