Downloaded 13 times
![Talk is cheap. Show me the code
1 from pywps.Process import WPSProcess
2 from osgeo import ogr
3 import types
4 [...]
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WPSProcess.__init__(self,
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identifier = "ogrbuffer", # must be same, as filename
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title="Buffer process using OGR")
8 [...]
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self.data = self.addComplexInput(identifier = "data")
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self.size = self.addLiteralInput(identifier="size")
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self.output =self.addComplexOutput(identifier="buffer")](https://image.slidesharecdn.com/cepicky-pywps-140209142834-phpapp02/85/PyWPS-at-COST-WPS-Workshop-26-320.jpg)
![Talk is cheap. Show me the code
1 from pywps.Process import WPSProcess
2 from osgeo import ogr
3 import types
4 [...]
5
WPSProcess.__init__(self,
6
identifier = "ogrbuffer", # must be same, as filename
7
title="Buffer process using OGR")
8 [...]
9
self.data = self.addComplexInput(identifier = "data")
10
self.size = self.addLiteralInput(identifier="size")
11
self.output =self.addComplexOutput(identifier="buffer")](https://image.slidesharecdn.com/cepicky-pywps-140209142834-phpapp02/85/PyWPS-at-COST-WPS-Workshop-27-320.jpg)
![Talk is cheap. Show me the code
1 from pywps.Process import WPSProcess
2 from osgeo import ogr
3 import types
4 [...]
5
WPSProcess.__init__(self,
6
identifier = "ogrbuffer", # must be same, as filename
7
title="Buffer process using OGR")
8 [...]
9
self.data = self.addComplexInput(identifier = "data")
10
self.size = self.addLiteralInput(identifier="size")
11
self.output =self.addComplexOutput(identifier="buffer")](https://image.slidesharecdn.com/cepicky-pywps-140209142834-phpapp02/85/PyWPS-at-COST-WPS-Workshop-28-320.jpg)
![Talk is cheap. Show me the code
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def execute(self):
inSource = ogr.Open(self.data.getValue())
inLayer = inSource.GetLayer()
[...]
outLayer = outSource.CreateLayer(
out,None,ogr.wkbUnknown)
[...]
while index < featureCount:
self.status.set("Calculating buffer for feature %d from %d
(100*(index+1)/featureCount*1.0))
[...]
inGeometry = inFeature.GetGeometryRef()
# make the buffer
buff = inGeometry.Buffer(float(self.size.getValue()))
[...]
self.output.setValue(out)
return](https://image.slidesharecdn.com/cepicky-pywps-140209142834-phpapp02/85/PyWPS-at-COST-WPS-Workshop-29-320.jpg)
![Talk is cheap. Show me the code
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def execute(self):
inSource = ogr.Open(self.data.getValue())
inLayer = inSource.GetLayer()
[...]
outLayer = outSource.CreateLayer(
out,None,ogr.wkbUnknown)
[...]
while index < featureCount:
self.status.set("Calculating buffer for feature %d from %d
(100*(index+1)/featureCount*1.0))
[...]
inGeometry = inFeature.GetGeometryRef()
# make the buffer
buff = inGeometry.Buffer(float(self.size.getValue()))
[...]
self.output.setValue(out)
return](https://image.slidesharecdn.com/cepicky-pywps-140209142834-phpapp02/85/PyWPS-at-COST-WPS-Workshop-30-320.jpg)
Uploaded byJachym Cepicky
PyWPS at COST WPS Workshop
This document provides an overview of PyWPS, an open source Python library for implementing OGC Web Processing Services (WPS). It discusses what PyWPS is and is not, provides code examples of defining and executing a buffer process, and outlines the project's history and future directions. Key points are that PyWPS allows connecting Python and other tools to perform geospatial analyses as WPS processes, is lightweight and modular, and a new version (PyWPS 4) is being developed to improve performance and compatibility.
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PyWPS at COST WPS Workshop
- 1. PyWPS – Projectstatus and demo ˇ ´ Jachym Cepick´ 1 y 1 Geosense s.r.o. http://geosense.cz WPS Workshop
- 2. Jachym Cepicky Forester OpenSource GISdeveloper (former user) - GRASS, OpenLayers, PyWPS, ... Member of Board of directors of Open Source Geospatial Foundation (OSGeo.org) @jachymc http://les-ejk.cz http://www.openstreetmap.org/user/jachymc
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- 4. What is PyWPS OGCWPS on the Server Since 2006 Python http://pywps.wald.intevation.org http://github.org/geopython/pywps
- 5. PyWPS - whatit is 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
- 6. PyWPS - whatit is 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
- 7. PyWPS - whatit is 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
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- 15. Keywords #accessories (GRASS, GDAL,Shapely, #python)
- 16. History of PyWPS 2006-11-10version 1.0.0 Web User Interface for WPS (Embrio). 2007-10-08 version 2.0.0 New version improved stability, Process class, OpenLayers 2.x. 2008-11-06 version 3.0.0 New code structure, implementation of WPS 1.0.0 2009-06-01 version 3.1.0 New generic JavaScript WPS Client library and more. 2011-09-06 version 3.2.0 MapServer 2013 Moved to GitHub http://github.com/geopython/pywps 2013-5 FOSS4G-CEE 2013, Bucharest, Started to work on PyWPS-4
- 17. How does itwork
- 18. How does itwork Internet, sharing
- 19. How does itwork
- 20. How does itwork
- 21. How does itwork
- 22. How does itwork One process
- 23. How does itwork Two processes
- 24. How does itwork Process chain
- 25.
- 26. Talk is cheap.Show me the code 1 from pywps.Process import WPSProcess 2 from osgeo import ogr 3 import types 4 [...] 5 WPSProcess.__init__(self, 6 identifier = "ogrbuffer", # must be same, as filename 7 title="Buffer process using OGR") 8 [...] 9 self.data = self.addComplexInput(identifier = "data") 10 self.size = self.addLiteralInput(identifier="size") 11 self.output =self.addComplexOutput(identifier="buffer")
- 27. Talk is cheap.Show me the code 1 from pywps.Process import WPSProcess 2 from osgeo import ogr 3 import types 4 [...] 5 WPSProcess.__init__(self, 6 identifier = "ogrbuffer", # must be same, as filename 7 title="Buffer process using OGR") 8 [...] 9 self.data = self.addComplexInput(identifier = "data") 10 self.size = self.addLiteralInput(identifier="size") 11 self.output =self.addComplexOutput(identifier="buffer")
- 28. Talk is cheap.Show me the code 1 from pywps.Process import WPSProcess 2 from osgeo import ogr 3 import types 4 [...] 5 WPSProcess.__init__(self, 6 identifier = "ogrbuffer", # must be same, as filename 7 title="Buffer process using OGR") 8 [...] 9 self.data = self.addComplexInput(identifier = "data") 10 self.size = self.addLiteralInput(identifier="size") 11 self.output =self.addComplexOutput(identifier="buffer")
- 29. Talk is cheap.Show me the code 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 def execute(self): inSource = ogr.Open(self.data.getValue()) inLayer = inSource.GetLayer() [...] outLayer = outSource.CreateLayer( out,None,ogr.wkbUnknown) [...] while index < featureCount: self.status.set("Calculating buffer for feature %d from %d (100*(index+1)/featureCount*1.0)) [...] inGeometry = inFeature.GetGeometryRef() # make the buffer buff = inGeometry.Buffer(float(self.size.getValue())) [...] self.output.setValue(out) return
- 30. Talk is cheap.Show me the code 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 def execute(self): inSource = ogr.Open(self.data.getValue()) inLayer = inSource.GetLayer() [...] outLayer = outSource.CreateLayer( out,None,ogr.wkbUnknown) [...] while index < featureCount: self.status.set("Calculating buffer for feature %d from %d (100*(index+1)/featureCount*1.0)) [...] inGeometry = inFeature.GetGeometryRef() # make the buffer buff = inGeometry.Buffer(float(self.size.getValue())) [...] self.output.setValue(out) return
- 31. What can beconnected Python* (GDAL/OGR, GRASS, MapServer, Shapely, Fiona, R, PostGIS, . . . ) Jython - Java* (GeoTools, JTS, GeoServer, . . . ) Any batch file
- 32. Tools, which aretested with PyWPS ¨ GRASS (GRASS-WPS interface, Soren Gebert) R Taverna (WPS-WSDL orchestration, Jorge de Jesus) MapServer (output generation using OGC OWS, still concept)
- 33. TOC 1 About PyWPS 2Code 3 PyWPS 4
- 34. Bright future Started fromscratch Use Python 2.7 (for future 3.0 migration) Try different interpreters of Python (pypy) Easy parsing with lxml Prepare for next WPS version Change of the whole process concept
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- 37. lxml http://lxml.org GRASS-WPS, GRASS-Python Werkzeughttp://werkzeug.pocoo.org/ Python 3 Django MapServer for output generation Respect to new OGC WPS 2.0.0 features ...
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