World Ozone & Ultraviolet Radiation Data Centre provides data discovery and access through interfaces implementing OGC standards

Contributed by: 
Tom Kralidis, Data Management, Meteorological Service of Canada

The World Ozone and Ultraviolet (UV) Radiation Data Centre (WOUDC) is one of six World Data Centres which are part of the Global Atmosphere Watch programme of the World Meteorological Organization.

WOUDC Data Search

The WOUDC data centre is operated by the Meteorological Service of Canada, a branch of Environment Canada. The Centre has been archiving ozone data since 1960 and solar ultraviolet (UV) radiation data since 1992.

WOUDC makes it possible to discover, visualize and access ground-based ozone and UV radiation data from a global archive. Data from 500 registered stations in the archive has been provided from over 150 contributors.

WOUDC's delivery of data has advanced with the advance of storage media and Internet and web technologies such as FTP, CD ROM and DVD ROM. This year the website was updated, providing modernized mechanisms that support discovery, visualization, access and management of ozone and UV data. All WOUDC data are available using the Centre’s data search / download, or web accessible folder (WAF) access. In addition, web services based on Open Geospatial Consortium (OGC) web service interface standards now provide standards-based search and on-demand access to the archive as described below.

1. Catalogue Service for the Web (CSW)

The OGC Catalogue Service provides a common interface to discover, browse and query discovery metadata (data about data). The WOUDC CSW provides a catalogue of all WOUDC data available in the archive. Metadata records are formatted using the ISO 19115/19139 geospatial metadata standards. WOUDC provides OGC CSW (version 2.0.2) at the following endpoint:

http://geo.woudc.org/csw?service=CSW&version=2.0.2&request=GetCapabilities

2. Web Map Service (WMS)

The OGC Web Map Service provides a common interface to access visualizations of geospatial data layers. Common web or desktop GIS applications deliver these visualizations in web friendly image formats such as PNG or JPEG. WOUDC provides OGC WMS (versions 1.1.1 - 1.3.0) at the following endpoint:

http://geo.woudc.org/ows?service=WMS&version=1.3.0&request=GetCapabilities

3. Web Feature Service (WFS)

The OGC Web Feature Service provides a common interface to access geospatial data. Typical use of WFS includes custom query / raw access to geospatial features. The WOUDC WFS implementation provides WOUDC archive data in numerous formats, including Extended CSV, KML, CSV, GML, ESRI Shapefile, MapInfo, and GeoJSON. 

The WFS has a server side limit of a maximum of 25000 features to ensure quality of service and availability. WOUDC provides access to data through OGC WFS (versions 1.0.0 - 1.1.0) compliant interface at the following endpoint:

http://geo.woudc.org/ows?service=WFS&version=1.1.0&request=GetCapabilities

For more information, please refer to the WOUDC data access page.