"Geotagging is the association of geographic location
information with an object. A geotag comprises three pieces of
information: a name and longitude and latitude values. Once files
are geotagged, they can be indexed and searched based on the
geographic information they contain. Here's how you can tag your
photos, documents and other files so you can search for
place-related information on your PC using Google Earth.
"Libferris is a virtual filesystem with index and search
capabilities that allows you to geotag files..."