Lambert Conformal Conic Projection

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Let lambda be the longitude, lambda_0 the reference longitude, phi the latitude, phi_0 the reference latitude, and phi_1 and phi_2 the standard parallels. Then the transformation of spherical coordinates to the plane via the Lambert conformal conic projection is given by

x=rhosin[n(lambda-lambda_0)]
(1)
y=rho_0-rhocos[n(lambda-lambda_0)],
(2)

where

F=(cosphi_1tan^n(1/4pi+1/2phi_1))/n
(3)
n=(ln(cosphi_1secphi_2))/(ln[tan(1/4pi+1/2phi_2)cot(1/4pi+1/2phi_1)])
(4)
rho=Fcot^n(1/4pi+1/2phi)
(5)
rho_0=Fcot^n(1/4pi+1/2phi_0).
(6)

The inverse formulas are

phi=2tan^(-1)[(F/rho)^(1/n)]-1/2pi
(7)
lambda=lambda_0+theta/n,
(8)

where

rho=sgn(n)sqrt(x^2+(rho_0-y)^2)
(9)
theta=tan^(-1)(x/(rho_0-y)),
(10)

with F, rho_0, and n as defined above.

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