- Install a GPS datalogger application on your iPhone 3G, I can recommend using "Trails" ($2.99). The data logger is used to create a GPS track of your movement, placing the data into a GPX file.
- Make sure to sync your camera's clock to the date & time on your iPhone.
- Launch the datalogger on your iPhone, the iPhone will have to remain in "awake" mode to track your movements, I suggest shutting down wifi, 3G and dimming the screen brightness to save battery life if you are planning to shoot for several hours.
- If you are using "Trails" touch the "+" to create a new track, place your iPhone in your pocket and...
- Start shooting digital images as you normally would, you can pause and re-start datalogging at anytime. Keep in mind, as long as Trails is logging your location to a track and you are simultaneously taking photos, the GPS data can then be synched up to your images.
- When you are done shooting, halt your GPS tracking in Trails and email the resulting track file (GPX) to yourself.
- The last step is to sync the GPX file with your digital images, resulting in location aware digital images. There are a few applications out there, HoudahGEO ($30) is very popular, I use Maperture Pro beta (currently $0) as a plugin for Apple Aperture. If you are an Aperture user, I recommend using Maperture Pro as it fits in nicely with Aperture workflow, you import your images (RAW or jpeg) as you normally would, then you select the images that you want to geotag. Then launch the Mapeture Pro plugin and drop the GPX file onto the Maperture Pro interface... and presto your images are updated with location information. No need for a separate $100 GPS data logger.
- In conclusion: 3 easy steps... 1. TRACK (iPhone 3G with Trails) -> 2. SHOOT images(your camera) -> 3. Sync GPS data to Images (HoudahGEO or Maperture Pro).
What can you do with you location aware digital images? With Aperture or iPhoto you can display your images on a google map and sort/organize by location. Additionally, there are a number of photo sharing web sites that support displaying geotagged images on a map such as Picasa Web Albums, Smugmug, Flickr and Panoramio.