THere is also pywps project http://pywps.wald.intevation.org
with direct support for grass gis jachym Randy George píše v St 27. 02. 2008 v 09:11 -0700: > I noticed OGC finalized the WPS spec: > http://www.opengeospatial.org/pressroom/pressreleases/843 > > > > Does anyone know of projects working on WPS implementations? > > > > The goal of WPS is apparently to provide a consistent framework for > interchangeable service process algorithms that can potentially be > chained together into answers to higher level questions than the > typical ‘what’, ‘when’, and ‘where.’ Dealing with ‘why’, ‘how much’, > and ‘what if’ modeling usually requires a process pipeline for > convolutions, boolean band operations, and summary pixel calculations, > all of which are cpu cycle intense, especially for large imagery sets. > In fact cpu usage issues would make the usual service approach > prohibitive. Even the little I have worked on JAI pipelines shows me > the futility of a one cpu to many service requests approach for WPS. > > > > However, looking at the AWS Simple Queue Service, SQS > http://www.amazon.com/Simple-Queue-Service-home-page/b/ref=sc_fe_l_2?ie=UTF8&node=13584001&no=3435361&me=A36L942TSJ2AJA, > some interesting possibilities come to mind. > > Locking message queues with AMI instance pools is essentially a poor > man’s supercomputer. It would be interesting to look at harnessing the > utility computing concept with instance pools available for each stage > in a process pipeline connected using the asynchronous SQS service. > This is a more or less controlled ‘distributed computing model’ > applied to WPS. > > Ref here for some examples of existing distributed computing projects: > http://distributedcomputing.info/projects.html > > > > Here are a couple possible approaches to a WPS service model that > might overcome the cpu bottle neck: > > 1) Sequential SQS pipeline with dedicated instance for each > process node - this would work best for operations amenable to a > streaming pipeline – Boolean band operations or pixel summary > operations for instance > > > > 2) Distributed computing model with a chunk server feeding a > pipeline and an array pool of instances processing the chunks coming > down the SQS queue – this would be better suited to tiled operations > > > > WPS is great when someone else provides the service. I imagine it > would be very interesting to the academic scientific world and > government groups tasked with providing access to all the myriad > imagery coming off space sensor platforms. > > > > Just thinking out loud. More thoughts here: > http://www.cadmaps.com/gisblog/?p=28 > > > > randy > > > > > _______________________________________________ > Discuss mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/discuss -- Jachym Cepicky e-mail: jachym.cepicky gmail com URL: http://les-ejk.cz GPG: http://www.les-ejk.cz/pgp/jachym_cepicky-gpg.pub
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