How do I measure the distance traveled by an iPhone using the accelerometer?

Question

While GPS works for long distance changes, I would like to measure a shorter distance by using the iPhone\'s accelerometer.

Say I want to measure a height of a box u

Answer 1

GPS is currently not accurate enough to measure a box. Take into account that there may be an error of about 10 meters to a mile. You can get back the accuracy of the measure with CLLocation.