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MathGroup Archive 2005

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mercator, robinsen projections

  • To: mathgroup at smc.vnet.net
  • Subject: [mg56104] mercator, robinsen projections
  • From: Edward Peschko <esp5 at pge.com>
  • Date: Fri, 15 Apr 2005 04:48:08 -0400 (EDT)
  • Sender: owner-wri-mathgroup at wolfram.com

hey all, 

    I was wondering if people had some pointers on how to translate Mercator 
Latitude/Longitude points to Robinsen (or other projections.)


Example:

    suppose I had a robinsen graph of the world, which is on a flat, 2D graph.
I'd like to 'pick points' off of this axis, and turn them into equivalent points 
on a mercator graph. And I'd like to go vice versa.

Is there a simple, mathematica function or package that will do this, eg:

	Mercator[.1,.1]

which takes the linear representation of Mercator 

	(
		x == 0 => corresponds to zero meridian, 
		x == -1 => corresponds to -180 longitude, 

		y == 0 => corresponds to equator, 
		y == -infinity => corresponds to the south pole
	)

and turns it into a latitude/longitude representation? Ultimately, I'd like to be 
able to say something like:

	Robinson_Coords[
		Mercator_LatLong[.1,.1]
	];

to convert from the flat, Mercator version of a map to the Robinson coordinates,
and

	Mercator_Coords[
		Robinson_LatLong[.1,.1]
	]


to go the other way around.

There's got to be a projections package out there somewhere, or is this a 
particular wheel I need to reinvent?

Thanks much,

Ed





	


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