An OGC web map service (WMS)
uses a standard syntax of requesting maps from servers. However, the companies that have created map
server software use different urls to access the maps. Some examples are listed below.
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ArcGIS Image Service - http://www.example.com/arcgis/services/<servicename>/MapServer/WMSServer
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ArcGIS Map Service - http://www.example.com/arcgis/services/<servicename>/ImageServer/WMSServer
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GeoServer - http://www.example.com/wms
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MapServer - http://www.example.com/cgi-bin/mapserv?map=<servicename>.map&