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I need to develop a map where KMLs are overlayed with road layers. So, KMLs are polygons, and I would need to use a map tiles like OpenStreetMaps. But the problem is how to put roads on top of KML areas? What do you suggest me? I would like to use some open source software. Thank you.

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I'm not sure that helps. – againstflow Aug 10 '12 at 20:21
Can you explain what else you need? I guess you have specific goals, but they aren't being communicated effectively. Saying "not useful" doesn't really help us to help you. – BradHards Aug 11 '12 at 3:53
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I need to develop a web map with any open source software which will show OpenStreetMaps. Then I need to add KML polygons and on the top of polygons I need to put roads. What do you suggest? How to add layer roads, does some shapefile or KML with world roads exists somewhere on the web or? – againstflow Aug 11 '12 at 12:42

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Openlayers will do this, eg when using a transparent wms.

http://docs.openlayers.org/library/introduction.html#adding-an-overlay-wms

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Can I add WMS with roads only? Where I can find it? – againstflow Aug 10 '12 at 21:30

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