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by: WB-InternalPosted on 2008-12-29 at 10:07:50ID: 23257368
I would think via some type of API you could get data about a given point (latitude/longitude) and once you have that, you just get the info form your next point and then calculate the difference.
if you just need to know for yourself on a one time basis, just click where you want, get the elevation and calculate the difference manually.