D-WCPS: A Framework for Service Based Distributed Processing of Coverages

摘要

Distributed, service-oriented systems is often used today for geospatial data access and processing. However, it is difficult to find methods for easy, flexible, and automatic composition and orchestration of workflow of geo-services. More promising is the Open Geospatial Consortium (OGC) Web Coverage Processing Service (WCPS), which offers a multidimensional raster processing query language with formal semantics; we believe that this language contains sufficient information for an automatic orchestration. Based on this, we present the D-WCPS (Distributed WCPS) – a framework in which coverage processing workflow can be dynamically distributed among several WCPS servers. Every server can schedule and execute a query using information from its local WCPS registry. Each local registry, in turn, is mirrored across all servers. Some other contributions of this paper include query optimization algorithms, tuple-based parallelism, registry synchronization techniques. Several servers can, therefore, efficiently share data and computation with respect to dynamic, resource-aware coverages processing.