I'm going to do my best to put together that primer. The ExifTool website describes exactly how to use the tool, but you might need a bit of a primer before you can get started.
For those of you old enough to have forgotten how DOS worked, too young to have heard of DOS, or not savvy enough for Linux (like me), you'll need to do a bit of scratching around online for the procedures. The tool is a command line tool, meaning that you'll have to go back to good old typing instructions into the command line window of your computer (just go to the Windows search and type in "CMD", and you'll be able to open the command-line interface).
I'm going to explain how I use Exiftool to geotag several hundred photographs at a time, using separate GPS trackfiles. The one that I've been using is a free tool called ExifTool. There are several software tools available online that can make the process a lot easier. But what if you don't have that tool, and you have a batch of several hundred photos that need geotagging? You can't manually geotag them all in Picassa or Google Earth.
Modern cellphones come with a geotagging option (you need to turn on the Geotagging in the camera settings). If your camera has a built-in GPS or you have a GPS accessory for your camera, you can automatically geotag your photos. If you look at the properties of one of your photographs, under the "details" tab, you will see a range of information about the photograph, right down to the focal length, f-stop and shutter speed, make and model of the camera, and of course the time the photo was taken (for some reason, in Windows, the time the photo was taken is labelled under "Date modified" not "Date created"). All photo files come with an associated metadata file the most common is the EXIF format, although there are others. Geotagging photographs is the process of adding a latitude and longitude to the photograph. They are part of the data collection process and provide evidence of the state of vegetation or of specific features of importance in the landscape, like a rare species or illegal dumping. Photographs are an important tool for consultants and researchers.
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