GitHub - geopython/OWSLib: OWSLib is a Python package for client programming with Open Geospatial Consortium (OGC) web service (hence OWS) interface standards, and their related content models. (original) (raw)
OWSLib
Overview
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 https://owslib.readthedocs.io
OWSLib provides a common API for accessing service metadata and wrappers for numerous OGC Web Service interfaces.
Installation
The easiest way to install OWSLib is via the Python piputility:
Requirements
- Python 3
- virtualenv
Dependencies
Dependencies are listed in requirements.txt. Dependencies are automatically installed during OWSLib installation.
Installing OWSLib
setup virtualenv
python3 -m venv owslib cd owslib source bin/activate
clone codebase and install
git clone https://github.com/geopython/OWSLib.git cd OWSLib python3 setup.py install
Running
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 module-based named Python loggers. You may configure your application to use the log messages like so:
>>> import logging
>>> LOGGER = logging.getLogger(__name__)
>>> # 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
>>> LOGGER.addHandler(ch)
>>> LOGGER.setLevel(logging.DEBUG)Releasing
update version
vi owslib/init.py git commit -m 'update release version' 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 on PyPI (must be a maintainer)
rm -fr build dist .egg-info python3 -m build twine upload dist/