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OGC Web Service utility library

Project description

Package for working with OGC map, feature, and coverage services.

OWSLib provides a common API for accessing service metadata and wrappers for GetCapabilities, GetMap, and GetFeature requests.

The OWSLib version 0.3 API is incompatible with version 0.2.1.

Dependencies

OWSLib requires elementtree (standard in 2.5 as xml.etree) or lxml.

Usage

Find out what a WMS has to offer. Service metadata:

>>> from owslib.wms import WebMapService
>>> wms = WebMapService('http://wms.jpl.nasa.gov/wms.cgi', version='1.1.1')
>>> wms.identification.type
'OGC:WMS'
>>> wms.identification.version
'1.1.1'
>>> wms.identification.title
'JPL Global Imagery Service'
>>> wms.identification.abstract
'WMS Server maintained by JPL, worldwide satellite imagery.'

Available layers:

>>> list(wms.contents)
['us_landsat_wgs84', 'modis', 'global_mosaic_base', 'huemapped_srtm',
'srtm_mag', 'daily_terra', 'us_ned', 'us_elevation', 'global_mosaic',
'daily_terra_ndvi', 'daily_aqua_ndvi', 'daily_aqua_721', 'daily_planet',
'BMNG', 'srtmplus', 'us_colordem', None, 'daily_aqua', 'worldwind_dem',
'daily_terra_721']

Details of a layer:

>>> wms['global_mosaic'].title
'WMS Global Mosaic, pan sharpened'
>>> wms['global_mosaic'].boundingBoxWGS84
(-180.0, -60.0, 180.0, 84.0)
>>> wms['global_mosaic'].crsOptions
['EPSG:4326', 'AUTO:42003']
>>> wms['global_mosaic'].styles
{'pseudo_bright': {'title': 'Pseudo-color image (Uses IR and Visual bands,
542 mapping), gamma 1.5'}, 'pseudo': {'title': '(default) Pseudo-color
image, pan sharpened (Uses IR and Visual bands, 542 mapping), gamma 1.5'},
'visual': {'title': 'Real-color image, pan sharpened (Uses the visual
bands, 321 mapping), gamma 1.5'}, 'pseudo_low': {'title': 'Pseudo-color
image, pan sharpened (Uses IR and Visual bands, 542 mapping)'},
'visual_low': {'title': 'Real-color image, pan sharpened (Uses the visual
bands, 321 mapping)'}, 'visual_bright': {'title': 'Real-color image (Uses
the visual bands, 321 mapping), gamma 1.5'}}

Available methods, their URLs, and available formats:

>>> [op.name for op in wms.operations]
['GetTileService', 'GetCapabilities', 'GetMap']
>>> wms.getOperationByName('GetMap').methods
{'Get': {'url': 'http://wms.jpl.nasa.gov/wms.cgi?'}}
>>> wms.getOperationByName('GetMap').formatOptions
['image/jpeg', 'image/png', 'image/geotiff', 'image/tiff']

That’s everything needed to make a request for imagery:

>>> img = wms.getmap(   layers=['global_mosaic'],
...                     styles=['visual_bright'],
...                     srs='EPSG:4326',
...                     bbox=(-112, 36, -106, 41),
...                     size=(300, 250),
...                     format='image/jpeg',
...                     transparent=True
...                     )
>>> out = open('jpl_mosaic_visb.jpg', 'wb')
>>> out.write(img.read())
>>> out.close()

A very similar API exists for WebFeatureService. See tests/MapServerWFSCapabilities.txt for details.

Known Issues

OWSLib works with WMS version 1.1.1 and WFS 1.0.0 Other versions are not supported at this time.

Support

OWSLib shares a wiki and email list with the Python Cartographic Library:

http://lists.gispython.org/mailman/listinfo/community

http://trac.gispython.org/projects/PCL/wiki

Updated project information can be found at

http://trac.gispython.org/projects/PCL/wiki/OwsLib

Project details


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