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Traitements de données à la demande Introduction au "Web Processing Service" Jérôme Gasperi | CCT OPS&SIL Toulouse - 10 janvier 2013
| Date post: | 27-Jun-2015 |
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Traitements de données à la demande Introduction au "Web Processing Service"
Jérôme Gasperi | CCT OPS&SILToulouse - 10 janvier 2013
Définition
WPS (Web Processing Service) est un standard de l'OGC qui définit des interfaces pour faciliter la publication, la description et l'exécution de traitements
Web Processing Service
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Web Processing Service
donnée
donnée information
Traitement
donnée information
Classification
Batiment
Eau
Végétation
Web Processing Service
GetCapabilitiesThe GetCapabi l i t ies operat ion p r o v i d e s a c c e s s t o g e n e r a l information about a l ive WPS implementat ion , and l i s t s the operations and access methods supported by that implementation
Découverte
1
GetCapabilitiesThe GetCapabi l i t ies operat ion p r o v i d e s a c c e s s t o g e n e r a l information about a l ive WPS implementat ion , and l i s t s the operations and access methods supported by that implementation
Découverte
1
DescribeProcessThe DescribeProcess operation allows WPS clients to request a full description of one or more processes that can be executed by the service. This description includes the input and output parameters and formats and can be used to automatically build a user interface to capture the parameter values to be used to execute a process
Description
2
GetCapabilitiesThe GetCapabi l i t ies operat ion p r o v i d e s a c c e s s t o g e n e r a l information about a l ive WPS implementat ion , and l i s t s the operations and access methods supported by that implementation
Découverte
1
DescribeProcessThe DescribeProcess operation allows WPS clients to request a full description of one or more processes that can be executed by the service. This description includes the input and output parameters and formats and can be used to automatically build a user interface to capture the parameter values to be used to execute a process
Description
2
ExecuteThe Execute operation allows WPS clients to run a specified process implemented by a server, using the input parameter values provided and r e t u r n i n g t h e ou t pu t v a l u e s produced. Inputs can be included directly in the Execute request, or reference web accessible resources
Exécution
3
<wps:Capabilities service="WPS" xml:lang="en-EN" version="1.0.0" updateSequence="1352815432361"><ows:ServiceIdentification> [...Service information i.e. title, abstract, keywords, etc...]</ows:ServiceIdentification><ows:ServiceProvider>
[...Provider information i.e. name, adress, phone, etc...]</ows:ServiceProvider><ows:OperationsMetadata>
[...URLs to GetCapabilities, DescribeProcess and execute services...]</ows:OperationsMetadata><wps:ProcessOfferings>
<wps:Process wps:processVersion="1.0.0"><ows:Identifier>urn:ogc:cstl:wps:otb:classification</ows:Identifier><ows:Title>Classification</ows:Title><ows:Abstract>Performs an image classification</ows:Abstract>
</wps:Process>[...]
</wps:ProcessOfferings><wps:Languages>
[...]</wps:Languages><wps:WSDL xlink:href=""/>
</wps:Capabilities>
GetCapabilities http://mon.serveur.com/wps?service=WPS&request=GetCapabilities
<wps:ProcessDescriptions xmlns:gml="http://www.opengis.net/gml" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" service="WPS" version="1.0.0" xml:lang="en-EN">
<ProcessDescription storeSupported="true" statusSupported="true" wps:processVersion="1.0.0"><ows:Identifier>urn:ogc:cstl:wps:otb:classification</ows:Identifier><ows:Title>Classification</ows:Title><ows:Abstract>Performs an image classification</ows:Abstract><DataInputs>
[...Standardized description of ComplexData, LiteralData or BoundingBoxData...]</DataInputs><ProcessOutputs>
[...Standardized description of ComplexOutput, LiteralOutput or BoundingBoxOutput...]</ProcessOutputs>
</ProcessDescription></wps:ProcessDescriptions>
DescribeProcess http://mon.serveur.com/wps?service=WPS&request=DescribeProcess&identifier=urn:ogc:cstl:wps:otb:classification
storeSupported Si true, l'éxecution est lancée de manière asynchrone - le service rend la main à l'utilisateur et le traitement s'effectue en tâche de fond. Sinon le traitement est exécuté de manière synchrone - la main est rendue à l'utilisateur lorsque le traitement est terminé
<wps:ExecuteResponse xml:lang="en" service="WPS" serviceInstance="http://mon.serveur.com/wps/wps?" statusLocation="http://mon.serveur.com/wps/wps?request=GetExecutionStatus&executionId=5e59-6dfe" version="1.0.0" xmlns:wps="http://www.opengis.net/wps/1.0.0" xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:xlink="http://www.w3.org/1999/xlink">
<wps:Process wps:processVersion="1.0.0"><ows:Identifier>urn:ogc:cstl:wps:otb:classification</ows:Identifier><ows:Title>Classification</ows:Title><ows:Abstract>Performs an image classification</ows:Abstract>
</wps:Process><wps:Status creationTime="2013-01-09T16:17:08.262Z">
<wps:ProcessAccepted>Process accepted</wps:ProcessAccepted></wps:Status>
</wps:ExecuteResponse>
Execute http://mon.serveur.com/wps?service=WPS&request=execute POST data+
statusLocation Le serveur de traitement met à jour le contenu de l'url statusLocation en fonction de l'avancé du traitement. Lorsque ce dernier est terminé, le statut passe en <wps:ProcessSucceeded>. Le client doit donc régulièrement appeler l'url de statusLocation afin de déterminer la fin du traitement
WPS en pratiqueEncapsulation des traitements de l'ORFEO Toolbox
ORFEO Toolboxhttp://orfeo-toolbox.org/
Traitements "simples"
Seuillage binaireAmélioration de la netteté
...etc...
Traitements avancés
OrthorectificationDétection de nuages
Calcul de l'indice foliaireSegmentation
Classification...etc...
Constellationhttp://www.constellation-sdi.org/
Inte
rfac
e W
PS
Client Serveur
http://mapshup.info
