OWSLib

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OWSLib is a Python package for client programming with Open Geospatial Consortium (OGC) web service (hence OWS) interface standards, and their related content models.

Full documentation is available at http://geopython.github.io/OWSLib

OWSLib provides a common API for accessing service metadata and wrappers for numerous OGC Web Service interfaces.

Dependencies

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

Installation

See http://geopython.github.io/OWSLib/#installation

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/wfs_MapServerWFSCapabilities.txt for details.

There is also support for Web Coverage Service (WCS), Catalogue Service for the Web (CSW), Web Processing Service (WPS), and Web Map Tile Service (WMTS). Some of those are beta quality.

Logging

OWSLib logs messages to the 'owslib' named python logger. You may configure your application to use the log messages like so:

>>> import logging
>>> owslib_log = logging.getLogger('owslib')
>>> # Add formatting and handlers as needed, for example to log to the console
>>> ch = logging.StreamHandler()
>>> ch.setLevel(logging.DEBUG)
>>> ch.setFormatter(logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s'))
>>> # add the handler to the logger
>>> owslib_log.addHandler(ch)
>>> owslib_log.setLevel(logging.DEBUG)

Releasing

.. code-block:: bash

update version

vi VERSION.txt vi owslib/init.py git commit -m 'update release version' VERSION.txt owslib/init.py

push changes

git push origin master git tag -a x.y.z -m 'tagging OWSLib release x.y.z'

push tag

git push --tags

update live docs

cd docs make html ./publish.sh

update on PyPI (must be a maintainer)

python setup.py sdist bdist_wheel --universal twine upload dist/*

Support

http://lists.osgeo.org/mailman/listinfo/owslib-users http://lists.osgeo.org/mailman/listinfo/owslib-devel