Originally Posted by tennisplayer_85
As explained in the previous comment, moving the spot where the ball hits (lands on) the court horizontally almost doesn't have any effect on the speed.
Moving the ball 1 foot in the vertical direction does by 1.6 miles of error (see previous comment). So the 10 miles you talk about would mean moving the ball more than 6 feet from it's real landing location. In normal circumstances you should be able to guess the balls location within a foot of its real location (especially if its close to the lines).
I have tested it with real videos from the australian open where the professional radar gun shows the speed so i was able to compare. All the calculations i did where within 2,5 miles of the radar gun's speed except for 1 out of 10, I suggest you try it your self at a pro tournament.
It would still be really nice to overcome the 'human error' of this step and i do have a way to reduce it! the idea is to overlay the 4 corners of the servicebox and then transfer the balls location from 1 dimension to the real dimension of the court. I am confident that this will be quite accurate. I hope to come with an update with this functionality, but give me some time
Anyway i think the App, as how it is, is the most accurate we can get with today's smartphones. And i still think the 2.5 miles error is not bad at all!
Agreed. Don't let the naysayers get to you.
If I could ever find my iPod touch I'll buy it - dying to try the app!
4 PS 85 StV, 2 PS StV 110, PS Chicago 125 & 110, 3 Bab Aero Origs, 2 KPS88, Donnay X-Blue 99, 2 Snauwaert ATP and 7 Wilson Woodfordes, Hi-Ten Set