[Proj] Length of a deg in metres

Charles Karney charles.karney at sri.com
Thu Nov 8 13:06:37 EST 2018

Dunno about getting the result from proj.  The formula you want is given


This includes the ellipsoidal correction.

On 11/8/18 10:18 AM, Nicolas Cadieux wrote:
> Hi,
> I am writing to python code to calculate the length (in metres) of a
> degree of longitude at a certain degree of latitude.  I would like to
> take various ellipsoid in mind (WGS84, GRS80, Clarke 1866...).  The goal
> is to find the right scale (or z factor) when making slope or shade
> raster models when x and y are in long/lat and z in feet or meters.  Can
> someone point me in the right direction to do this in using Proj?  Is
> Proj the best option for this?
> Thanks,
> Nicolas
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