Reply to "Defendable Elevations"

duanerussellMeasurer

Oscar, I think we are trying for too much precision using methods that are not intended to be precise.

Using the barometric elevations on my Garmin Oregon 400, I don't trust it at all. I can ride the routes multiple times, then compare tracks, and all will be different for the Start and Finish point, even when it is a single point, not separated locations.

Satellite-based elevations could be more accurate, if the unit is capable of more accuracy. But, unless we get a survey-grade GPS, I don't think we can expect inexpensive devices, nor free online imagery (GoogleEarth, etc) to give us accuracy to a foot, or even 10 feet. But, why do we need such accuracy?

For a drop of less than 1 meter in 1 km for records, we don't need less than a meter accuracy, unless the Finish is right around 5 meters lower than the Start (for a 5k). When it is that close to the threshold, it may take locating a topo map with sufficient scale.

11/22/178:28 AM

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