Users can upload their own photos onto Google Maps and mark them on the map precisely where they were taken and of course what they were actually of. This is a relatively new concept has become known as 'Geotagging'. With the advent of mobile devices such as the Apple iPhone or Blackberry which feature both GPS (Global Positioning System) technology and a camera, I predict this will become a more and more popular thing for people to do. It is a very democratic way for amateurs to share material on a specific place/space. The iPhone now automatically adds geographical identification metadata to the photograph/video that is taken and in Apple's iPhoto the image/video can be viewed on a map showing where it was taken in the world. Above is a map of edinburgh showing all the real estate/photos/wikipedia articles that members of the public have added and gives evidence that their are considerable number of people participating.
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