zero points, scales, nonperpendicularity and orientation.
coeffs double[6] transformation coefficients (see note)
*xz double x zero point *yz double y zero point *xs double x scale *ys double y scale *perp double nonperpendicularity (radians) *orient double orientation (radians) The model relates two sets of [x,y] coordinates as follows.
coeffs[0] = a coeffs[1] = b coeffs[2] = c coeffs[3] = d coeffs[4] = e coeffs[5] = f The model transforms coordinates [x1,y1] into coordinates
x2 = a + b*x1 + c*y1 y2 = d + e*x1 + f*y1
x' = xz + x1 y' = yz + y1
x'' = xs*x' y'' = ys*y'
x''' = cos(perp)*x'' + sin(perp)*y'' y''' = sin(perp)*x'' + cos(perp)*y''
x2 = cos(orient)*x''' + sin(orient)*y''' y2 =-sin(orient)*y''' + cos(orient)*y''' See also slaFitxy, slaPxy, slaInvf, slaXy2xy P.T.Wallace Starlink 31 October 1993