[Openstreetmap] Formula for EPSG:4362 and questions to mercator projection?

[Mikel Maron]

My understanding is that EPSG:4326 specifies a projection, 
with WGS84 as the Coordinate Reference System (the agreed abstract geometry of the earth)
and no coordinate transformation (really, the sphere of the earth is projected into 2D onto a cylinder)

That wikipedia Mercator map does appear to stop before the poles, couldn't say precisely at what latitude though.

----- Original Message ----
From: Immanuel Scholz <immanuel.scholz at gmx.de>
To: openstreetmap at vr.ucl.ac.uk
Sent: Thursday, January 12, 2006 11:56:42 PM
Subject: [Openstreetmap] Formula for EPSG:4362 and questions to mercator projection?

Hi,

can someone explain me the formula for the projection "EPSG:4362" used in 
WGS84?

It looks a bit like a mercator projection but with the pole not as much 
distorted... ?



And when we are on it: The mercator projection can not project the north- and 
south pole correctly. A picture of the whole world would be infinite in 
height.

How comes, that there are maps of the whole world in mercator projection?
http://en.wikipedia.org/wiki/Image:Mercator-proj.jpeg

Are there a standard at which latitude the projection stops? If I stop at +-85 
degree of latitude, I get a map with roughly equal dimension in width and 
height. Is the "border latitude" for mercator somewhere there?

Or is some kind of magic used to project the near-pole regions in mercator 
projection and the formular at 
http://en.wikipedia.org/wiki/Mercator_projection is simple wrong?


Ciao, Imi.

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