Taking elevation into account when calculating distance
Ask Pythagoras? On a small enough raster so that you can ignore the (nearly) spherical earth its just sqrt(dx^2+dy^2+dz^2) where dz is the elevation difference in the same units as x and y. Sample the elevations from the raster using the functions in the raster package. Job done? Barry
On Fri, Nov 29, 2013 at 10:27 AM, John Tellat <john.tellat at gmail.com> wrote:
Hi,
I?m currently dealing with telemetry data combined with altitude
measurements in a mountainous area with many valleys.
I want to compute the straight distance between points but taking into
account the elevation which is likely to extend the distance.
Any idea on how to compute the "real distance" based on elevation raster
data?
Thanks!
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