[gdal-dev] Spherical Mercator Projection mismatching major/minor axis

[Tobias Wendorff]

Am 06.11.2020 um 12:07 schrieb jratike80:
> This does not really belong to my knowledge area but I'll have a try anyway.

To add a bit of my knowledge, EPSG:3857 is the king/queen of 
unconformness (better unconform-mess):

The geographic reference is based on geographic coordinates in WGS84 
(ellipsoid), the projection is based on a sphere. The background is that 
the spherical math is way easier and it was therefor faster to render 
(and easiert to code). You don't need to solve any integrals etc.

Wikipedia describes the problem:
https://en.wikipedia.org/wiki/Web_Mercator_projection

A discussion about that is appear at least once a year in OpenStreetMap 
community, when a GIS specialist or scientist uses the data for the 
first time ;)