 
The center of a spot is simply the longitude and latitude. Google maps allows more precision than Microsoft's TerraServer. For instance, this URL will show the streets in Morton:
City of Morton, WA with Google Maps On Microsoft's TerraServer, the above number is rounded up: City of Morton, WA with Microsoft TerraServer Another option is TerraServer.com, which will allow exact decimal coordinates here: TerraServer.com - Coordinates Search These methods can all be used to verify the longitude and latitude of your spot. Of course, there are a variety of ways to make this easier for the user; however, we need to specify a spot first. Google Maps has a zoom factor, which is specified by spn=x,y. For our spot calculation we will assume we want .03,.03. For the actual spot for the morton area, we will round to two decimal places: http://maps.google.com/maps?ll=46.56,-122.28&spn=.03,.03 So far, then, it seems like the best definition for a spot is just to just cat the numbers together using the same precision. That is, a spot would be: 46DOT56NEG122DOT28 The above spot would be very easy to search for. Pretty much if you put a page up that got any traffic at all, the database could be existing search engines. It is kind of interesting. With this, just put the spot up wherever. People could search for the spot quite easily. The "service" would simply be search engines. Of course, you can't rely on search engines, but there could be specific mirrors, etc. Trust, though, is a different matter.
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