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JMunaretto

Accessing Data from GPS

Now I can get the each intervals time, distance, elevation, and coordinates, but I'm looking for a few more things.

In the gpx info I get, there is one value of elevation for each point. Now in reality, I can see 3 ways to get elevation.

#1 Altimeter reading. I'm assuming this is what it's outputting

#2 Vertical GPS coordinate. Or maybe its this

#3 Estimating elevation by mapping the latitude/longitude coordinates onto a topo map to calculate.

My question is, I want all 3 values, and does anyone know how to get all 3, ideally in a efficient manner? I would like to formulate some sort of accuracy improvement of altitude with an algorithm considering all three values and their pros/cons.

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