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I'd like to provide a map based search of map services in a web app.

Ideally, I'd like a web service that displays markers at different zoom levels: local, municipal, county, regional, state or national level. When I click on a marker, I'd like to see a list of urls representing the map services published by that governmental entity.

For example, for a typical state I would expect to see a marker for each county that has public web mapping services. The marker would appear on the county seat, and would contain a url to that counties' map services.

My primary focus is Texas, USA, but any examples of map service map services would be useful.

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I was going to jump in and say and the related on-premise product, but oddly enough... I don't see a map of maps... just a text based search. – James Schek May 3 '11 at 15:03
I think it's time for someone to build this...which is what I said last time you brought up something similar ;)… – Derek Swingley May 3 '11 at 15:08
@derek - I've generalized my search for any sort of map - not just arcgis. I'm also surprised there isn't something like this in google earth. – Kirk Kuykendall May 3 '11 at 15:16

ONE Geology does this (Europe centric)

Limited USA data - but you can add your own or public WMS links to the map

enter image description here (Internet Explorer 7,8,9 only)

More technical details here

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Although not a map, a carefully crafted google search through the API could work wonders:

getcapabilities application/vnd.ogc.wms_xml

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If you combined those URLs with a Geoip database, you could make a map :) – Ragi Yaser Burhum May 5 '11 at 1:36

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