Adding Web Map Service data to a map chart

WMS is an Open Geospatial Consortium protocol for delivering geo-referenced map images over the Internet. There are many public WMS servers. The free ones are mostly provided by government agencies and research and educational organizations. Spatineo (, a commercial spatial web services monitor, provides a free, searchable list of WMS resources, as does Skylab Mobilesystems ( The US government's open Data Catalog ( is a good resource for US-specific WMS links. However, there are lots of other lists; just search for WMS servers.

When you find a WMS server of interest, you want the WMS URL so you can ...

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