Thursday, 15 November 2018

coordinate system - What's the purpose of the reference latitude in Lambert Conformal Conic?


Going through flight school I got acquainted with the Lambert Conformal Conic projection, as it's the common projection for VFR sectional charts, and I think I have pretty good grasp of it, geometrically.


However, trying to wrap my head around the mathematics behind it I browse around on Wikipedia and on MathWorld which both more or less simply list the formulas, not really diving into the mathematics behind it.


It appears to have 4 parameters:



  • The two standard parallels,

  • reference longitude, and reference latitude



What is the purpose of the reference longitude/latitude? Do they affect the actual projection, or will they simply shift the result to let the reference coordinates result in (x,y)=(0,0)?




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