I could share the iPhone shots immediately on Instagram and record the geotags for use later in Aperture. Back home, here's how I applied the location information.
1. Connect the iPhone to my Mac.
2. Select the images I want to geotag in Aperture's browser.
3. Click on Places.
4. Click on the GPS button and choose Import GPS from iPhone photos.
5. Navigate through the thumbnails and choose the photo that is closest to the desired location. Click OK.
6. Drag images on the the purple marker that appears on the map. Aperture will change the marker to a red pin and add the location data to those images.
7. Check my work by selecting GPS from the popup menu in the Info tab of the Inspector.
Exporting with geotags in place
The location data applied to the photos can travel outside of Aperture too. To make sure this happens, check Aperture's Preferences. Click on the Export tab and confirm that the box next to include location info in exported photos is checked. Conversely, if you don't want geotags to travel with exported pictures, uncheck the box.
You can test that all systems are go by exporting a geotagged image from Aperture. Then open the picture in the Preview app on your Mac. Hold down Command-I to reveal the General Info Box. Click on the i tab then choose GPS. If there aren't any geotags for the image, there also won't be a GPS button.
But if there are geotags for the picture, you'll see a map and coordinates when you click on the GPS button. And the fun doesn't stop there. Click on the Locate button, and if you have Max OS X Mavericks, your Mac will launch Maps and display the area where you took the photo.
Since driving directions are available in Maps, you can send an image to a friend and they'll know how to get there.
These methods of applying location data to your images aren't as precise as an accurate GPS accessory connected to your camera. If you need a high level of accuracy, I probably wouldn't go this route.
But, for travel photos and general usage, adding tags to your favorite shots in Aperture is easy, and probably close enough for most applications.
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