[Proj] Length of a deg in metres

Luí­s Moreira de Sousa luis.de.sousa at protonmail.ch
Fri Nov 9 05:30:20 EST 2018

Hi Nicolas,

PROJ itself relies on the GeographicLib package [0] for the computation of geodesics and rhumb lines. Since you are programming in Python, the easiest option is to use directly the GeographicLib port to Python [1].


[0] https://geographiclib.sourceforge.io/
[1] https://pypi.org/project/geographiclib/

Luís Moreira de Sousa
Email: luis.de.sousa at protonmail.ch
RingID: ring:7ca91d83f4f9dec82fec9f1144b8e5c1ef2a110c
URL: https://ldesousa.github.io

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‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Thursday, November 8, 2018 4:18 PM, Nicolas Cadieux <nicolas.cadieux at archeotec.ca> 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
> Proj mailing list
> Proj at lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj

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