Vlad

Wikipedia:

Geotagging is the process of adding geographical identification metadata to various media…

Let’s see how this works for pictures. There are several reasons for doing that:

• You want to remember where was it that  you took some great picture.
• Or, you want to brag about it and show your friends the places you’ve visited.

I won’t question your reasons; if you’ve read so far, I assume you’re really interested in how to do it. It’s quite easy: buy yourself a camera with integrated GPS. A phone (or an iPhone). It will automatically add geotags to your photos’ EXIF information.

Or, if you already have a camera (or phone) and a GPS receiver, why not use the data recorded by the GPS and cross-reference it with your photos’ date and time. You only need to:
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