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I know that Google gave a way to opt out of Google News and recently started identifying the News spider to let the site owners decide whether they want it or not. Is there a similar process for Maps?
I am wondering if Google provides a finer-grained option, as it now does for newspaper owners (i.e. you can keep your articles in the main index, but not participate in Google News). Anybody know?
No, I do not believe there's any way to be indexed in one without the other, aside from trying to detect Googlebot and suppress addresses and geocoordinates from being displayed to Googlebot (which would be a form of cloaking, risking penalization).
I don't quite understand why you have no trouble with excerpts/snippets showing up in regular SERPs, but do not want them to show up in local search where they may actually be even more relevant. Both provide multiple opportunities for your content to be found and clicked upon...