Measuring velocity via iPhone SDK

Question

I need to implement a native iPhone app to measure the velocity of the phone (basically a speedometer). I know that you can do so via the CoreLocation API fairly easily, bu

Answer 1

I'm not sure you'll get very far trying to track velocity using the accelerometer. To do this, you'd have to make sure you captured EVERY acceleration, since any missed data points would indicate the wrong velocity (this is assuming, of course, you're able to convert the reported accelerometer values into standard units). Thus, you'd have to constantly run the accelerometer stuff, which sucks quite a bit of juice in itself (and, again, you won't be guaranteed all accelerations). I'd recommend using CoreLocation.