Figure 1: Theodolite photo of the building housing Washington Apple Pi’s corporate offices. Overprinted information includes the date and time, a position of 39.0539ºN and -077.1067ºE, with an altitude of 384 feet. The photo was taking with a bearing of 292.3º, an elevation angle of +0.7º, and a horizontal angle of +02.1º. Compare the imprinted information with that in Figure 3. (Photo by Lawrence I. Charters)Figure 2: Theodolite’s screen shows an image as viewed through the iPhone camera overlaid with various buttons and readings. This screen capture was made in Olney, MD, at +039.1449ºN, -077.0419ºE, altitude 440 feet, near Olney Theater. (Photo by Lawrence I. Charters)Figure 3: The Station Hassler survey marker, shot from directly overhead with Theodolite. Overwritten on the image is the time and date, a position of +038.9927º, -077.0313º, an altitude of 397 feet, azimuth/bearing of 139º S41E, elevation angle of -87.3º, horizontal angle of +160º, and no zoom. There are slight differences in how the information is displayed from the earlier photo of the Pi offices (Figure 1), taken four months earlier, thanks to updates from the publisher. (Photo by Lawrence I. Charters)An iPhone photo special: georeferenced photo of my finger. (Photo by Lawrence I. Charters)The plinth in Hassler Park with the survey marker on the top. (Photo by Lawrence I. Charters)Ferdinand Hassler's image, on display in Hassler Park. (Photo by Lawrence I. Charters)More information on Hassler, from the plaque in Hassler Park. (Photo by Lawrence I. Charters)Photo taken with Theodolite inside Verizon Center in downtown Washington, DC. The GPS information obviously comes from cell tower signals, since the phone can't "see" satellites inside the building. There is a certain irony in getting GPS information from an iPhone linked to the AT&T network from inside Verizon Center. (Photo by Lawrence I. Charters)Photo of the building housing Washington Apple Pi's corporate offices, taken with Theodolite's 2X zoom setting. (Photo by Lawrence I. Charters)Photo of the building housing Washington Apple Pi's corporate offices, taken with Theodolite's 4X zoom setting. (Photo by Lawrence I. Charters)Screen shot of Theodolite's screen, overlaid atop a photo of the building holding Washington Apple Pi's corporate offices. There are a number of differences between this screen capture, made in December 2009, and Figure 2, made in April 2010. (Photo by Lawrence I. Charters)An attempt to use Theodolite in Scotland while the iPhone was in Airplane Mode. Airplane Mode turns off the radios in the iPhone, and that obviously doesn't work too well: the GPS information should read 56.462551 N, -4.320236 E, and instead indicates a spot in Maryland 3,400 miles away. (Photo by Lawrence I. Charters)The iPhone is perfectly capable of logging GPS information, but it hides the data in the photos EXIF metadata. IMG_0225, taken with an iPhone, is highlighted in Aperture 3, with the metadata revealing a location of 38.992667
