Re: Maps Data API without authentification / Get list of features in a radius from an owned map.

If your map is public, no sign in is required. According to this blog
post:
http://googlegeodevelopers.blogspot.com/2009/12/maps-data-api-bringing-geospatial.html

Maybe you should search or post the Google Maps Data API forum for
details
http://groups.google.com/group/google-maps-data-api

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