Another nice post from Chris Silver Smith on Local Business SEO for Geo titled Should You Geotag Pages For Local SEO? As Silver Smith points out, geocoding web pages is acheived through semantic markup formats such as Geo microformat, ICBM meta tag (GeoURL), RDF tags, and the Geo tag meta data format. These various approaches are nicely summed up at the following Geotagging wikipedia page.
Which format to use? Here’s what Silver Smith has to say on the matter:
If you were only going to add one set of geotags, I’d suggest adding either the Geo microformat or RDF, because they’re supported in some ways by Yahoo! and Google (”supported” in the sense that both deliver up local content with microformats, and both have used microformats and RDF for purposes of special results listing treatments). Also, providing the coordinates on the page visibly can enhance usefulness as people are able to copy them directly into their GPS devices.