iPhone Core Location: Calculate total elevation loss/gain

Question

I am wanting to calculate total elevation loss and gain at the end of recording Core Location data. I am having a hard time thinking of the math for this one.

Say if I started at 600 feet and I go up and down during the tracking, how would I calculate my elevation gain and loss?

Ideas?

Answer 1

If you go up, increase one number. If you go down, increase (or decrease?) the other.

Exactly how you decide to handle noise is up to you...