[PROJ] Latitude of natural origin in Transverse Mercator

[Charles Karney]

These are two interchangeable ways of shifting the northing component of
the projected coordinate.  Mathematically they both do exactly the same
thing and there's nothing the matter with specifying both a latitude of
origin and false northing.  Indeed the Ordnance Survey grid system for
Britain specifies

  central longitude = -2 deg
  latitude of origin = 49 deg
  false northing = - -100 km

This means that a shift is added to the northing component to ensure
that the northing at latitude/longitude = (49 deg, -2 deg) is -100 km.


On 1/13/23 09:28, Javier Jimenez Shaw wrote:
> Hi
> 
> I have a question about Transverse Mercator.
> What is the impact of the parameter "Latitude of natural origin", 
> compared with the "False Northing"? (apart from the fact that one is in 
> degrees and the other in meters)
> Is there any difference on using a Latitude of natural origin of, let's 
> say, 40 degrees, or compute the equivalent False Northing?
> 
> Thanks.
> Javier
> .___ ._ ..._ .. . ._.  .___ .. __ . _. . __..  ... .... ._ .__
> Entre dos pensamientos racionales
> hay infinitos pensamientos irracionales.
> 
> 
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