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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 arcgis.com and the related ArcGIS.com 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 ;) gis.stackexchange.com/questions/4985/… –  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
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2 Answers 2

ONE Geology does this (Europe centric)

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

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http://portal.onegeology.org/ (Internet Explorer 7,8,9 only)

More technical details here http://www.onegeology.org/wmsCookbook/home.html

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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 site:.gov

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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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