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Since the OGC promoted the specification of OGC Web Processing Service (WPS), several researches on the development of geospatial online service have been happened. Most of WPSs are developed extending on GIS software or APIs. Nowadays, most databases are extended to support spatial data and also provide a number of spatial functions which can be called through SQL. This paper presents the development of WPS which uses spatial database as processing engine. Extended WPS protocol is designed to support SQL to invoke spatial function. Using SQL eases the modification of WPS regarding the change of processing function service.
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