Jérôme Gasperi Web Processing Service CCT SIL - Cloud Computing IAS - Toulouse, France - May 30th, 2013 

Web Processing Service Example - Land Cover Classification WPS on the cloud What's next 

WPS Web Processing Service 

WPS is an OGC standard which defines interfaces to publish, describe and execute geospatial processes 

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GetCapabilities The GetCapabilities operation p r ov i d e s a c c e s s t o g e n e r a l information about a live WPS implementation, and lists the operations and access methods supported by that implementation Publish 1 

GetCapabilities The GetCapabilities operation p r ov i d e s a c c e s s t o g e n e r a l information about a live WPS implementation, and lists the operations and access methods supported by that implementation Publish 1 DescribeProcess The 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 Describe 2 

GetCapabilities The GetCapabilities operation p r ov i d e s a c c e s s t o g e n e r a l information about a live WPS implementation, and lists the operations and access methods supported by that implementation Publish 1 DescribeProcess The 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 Describe 2 Execute The Execute operation allows WPS clients to run a specified process implemented by a server, using the input parameter values provided and returning the output values produced. Inputs can be included directly in the Execute request, or reference web accessible resources Execute 3 

Example WPS for assisted land cover classification 

From pixel... Remote sensing image 

From pixel... Remote sensing image ...to information Land cover thematic map 

WPS a Processing Web application 

mapshup Web application http://mapshup.info WPS Constellation http://www.constellation-sdi.org Orfeo Toolbox Processing http://orfeo-toolbox.org 

Orfeo Toolbox Remote sensing image library Open Source Developped by the French Space Agency Processing 

Orfeo Toolbox More than 70 high level processing chains orthorectification segmentation classification etc. Processing 

Orfeo Toolbox More than 70 high level processing chains orthorectification segmentation classification etc. Processing Supervised learning (land cover is computed from a set of "well known areas" given by user) Based on SVM (http://en.wikipedia.org/wiki/Support_vector_machine) 

Constellation WPS Geospatial Networking Services OGC/ISO implementations Multi platform (JAVA) OpenSource WMS WFS CSW WPS 

mapshup Improves access to geospatial data HTML + javascript Based on OpenLayers and jQuery Web application 

mapshup Supported data sources WMS WFS CSW WPS OpenSearch etc. Flickr Youtube GeoRSS KML Wikipedia Google maps Bing maps OpenStreetMap MapBox WMTS Web application 

mapshup Supported data sources See WPS demo https://vimeo.com/67288678 WMS WFS CSW WPS OpenSearch etc. Flickr Youtube GeoRSS KML Wikipedia Google maps Bing maps OpenStreetMap MapBox WMTS Web application 

WPS a WPS a Web application 1 1 - DescribeProcess request for "Classification" Classification process description 2 2 - Set up MMI from process description + Image Well known areas 3 3 - Execute an asynchronous "Classification" request Land Cover 4 4 - Display result retrieved as a WMS layer Orfeo Toolbox mapshup 

https://vimeo.com/67288677 

WPS on the cloud OWS-10 OGC testbed - Orthorectifying images hosted by a cloud infrastructure using WPS standard 

WMS Web Client mapshup EU Cloud WPS Orthorectification CNES - Orfeo Toobox WMS WPS Assess Quality Improve Quality Astrium Pléiades sample data 

Landsat Landsat Landsat 3. Click on '+' to process a new orthorectification. Process parameters are set by user and sent to an asynchronous WPS orthorectification process located on the 2. Multiple orthorectified images (i.e. processed with different parameters) can be associated to a raw image Landsat 4. Orthorectified image quality can be checked through "Assess Quality" WPS process located on the Result is displayed within the map as a WMS quality layer stored on the 1. Select raw image to orthorectify within CSW catalog located on the Laat 

What's next WPS 2.0 

The major flaw in WPS 1.0 is the lack of true asynchronous process management...There is no way to cancel a launched process ! WPS 2.0 addresses this issue by defining a set of process management operations - Cancel, Stop, Resume and GetStatus. This set of operations is a must have to deploy asynchronous WPS on the cloud. The WPS 2.0 should be an official OGC standard by the end of 2013. 

https://speakerdeck.com/jjrom/web-processing-service [email protected] 

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