Cepicky charvat pdf_gi2011_pywps_final
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GI2011-X-border-SDI/GDI-Symposium, 23..5.2011: Bad Schandau (SAX) [ 11. Sächsisches GIS-Forum ] 24.5.2011: Decin (CZE) [ 1. Bohemian#Saxonian GIS-Forum ]
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Cepicky charvat pdf_gi2011_pywps_final
- 1. PyWPS Jachym Cepicky, Karel Charvát jachym@bnhelp.cz http://bnhelp.cz charvat@ccss.cz http://ccss.cz Jachym Cepicky PyWPS 1 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 2. PyWPS ● Implementation of OGC Web Processing Service (OGC WPS) on the server-side ● Started 2006 ● Python-based ● Support for GRASS GIS, GDAL, PROJ4, R, ... Jachym Cepicky PyWPS 2 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 3. What is PyWPS not ● PyWPS is no analytical tool or engine. It does not perform any type of geospatial calculation. ● PyWPS is not special XML parser or generator. It does not validate your GMLs against given schemas (yet), it does not build GML from Python objects. ● It is not complicated. Or, it should not be. Jachym Cepicky PyWPS 3 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 4. Shortly about OGC WPS ● Protocol similar to WMS ● GetCapabilities → List of Processes ● DescribeProcesses → Selected proces specification (In- and Outputs) ● Execute → Performs calculation, returns result ● KVP vs XML ● service=WPS&request=GetCapabilities&version=1.0.0 ● <ows:GetCapabilities xmlns:ows="http://www.opengis.net/ows/1.1" xmlns:wps=" http://www.opengis.net/wps/1.0.0" … service="WPS"> <ows:AcceptVersions> <ows:Version>1.0.0</ows:Version> </ows:AcceptVersions> </ows:GetCapabilities> Jachym Cepicky PyWPS 4 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 5. PyWPS Featuers ● Python-based (< 3.0) ● WPS 1.0.0 ● No processes within the distribution → User has to code custom ones ● On-the-fly creation of GRASS temporary Location/Mapset, if the process does require GRASS modules ● Support for Java libraries (Sextant, …) ● WSDL/SOAP interface Jachym Cepicky PyWPS 5 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 6. PyWPS Architecture Processes Jachym Cepicky PyWPS 6 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 7. PyWPS Architecture ● PyWPS is „just“ thin layer (wrapper) between Internet and processing tool ● As processing tool, various popular GIS programs can be used, for example: ● GRASS GIS ● GDAL/OGR ● Proj4 ● Shapely, R, ... ● The process is to be desgined by the „user“ - programator, who will setup PyWPS Jachym Cepicky PyWPS 7 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 8. News from SVN ● Runs with Jython (Java implementation of Python interpreter) → Direct access to Java world (Used in Humboldt project) ● Support for GRASS 7 WPS interface (Sören Gebert) ● WSDL/Soap bindings (Jorge de Jesus) → PyWPS 3.2 ● Orchestrization of processes using Taverna Jachym Cepicky PyWPS 8 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 9. PyWPS 4.0 ideas ● Be Python 3 ready - use Python 2.7 (currently, it should work on Python 2.4+) ● Use lxml for XML parsing AND writing ● Bring assynchronous calls to windows ● In the debug mode, validate input XMLs against schemas. ● Prepare for WPS 2.0 ● More closer integration with GRASS GIS ● License change ● Process concept ● Use XML conofiguration? ● Jython issue (lxml is CPython-based) Jachym Cepicky PyWPS 9 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 10. Links ● Main page http://pywps.wald.intevation.org ● Wiki http://wiki.rsg.pml.ac.uk/pywps/ ● http://opengeospatial.org/standards/wps Jachym Cepicky PyWPS 10 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 11. Supportes ● Help Service – Remote Sensing s.r.o. http://bnhelp.cz ● Netmar project http://netmar.nersc.no/ ● Prezem project http://prezem.cz ● Humboldt project http://esdi-humboldt.eu Jachym Cepicky PyWPS 11 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 12. Examples in the real world http://geo.sazp.sk Jachym Cepicky PyWPS 12 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 13. Examples in the real world http://povoden.kraj-lbc.cz Jachym Cepicky PyWPS 13 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 14. Examples in the real world http://dev.bnhelp.cz/inspire/client Jachym Cepicky PyWPS 14 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium
- 15. Projects using PyWPS ● Prezem (precision farming) http://prezem.cz ● Humboldt http://esdi-humboldt.eu ● Netmar http://netmar.nersc.no/ ● … ● PyWPS is used for various INSPIRE-related tasks (e.g. Transformation service) among others at JRC Ispra. Jachym Cepicky PyWPS 15 jachym@bnhelp.cz Help Service – Remote Sensing GI2011-X-border-SDI/GDI Symposium