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HAMMERprojXY<-function(phi, lam)
{
## HAMMER Projection from Wikipedia
## phi = co-latitude (radians)
## lam = longitude (radians)
sq2 = sqrt(2)
cphi = cos(phi)
sinlam = sin(lam/2)
den = sqrt(1 + cphi * cos(lam/2))
x = 2*sq2*cphi *sin(lam/2)/den
y = sq2*sin(phi)/den
return(list(x=x, y=y))
}
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