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include <math.h>
task pltmodel = t_pltmodel
procedure t_pltmodel()
double x_zero, y_zero, xi_zero, eta_zero, ra_tan, dec_tan, scale, ratio
double xrot, yrot, dra_tan, ddec_tan, x, y, xstep, ystep, tra, tdec
double xpix[1000], ypix[1000], xi[1000], eta[1000], dxi[1000], deta[1000]
double cosd, sind, dra, ddec, c1, f1, b1, ddxi, ddeta, q1, q2, q3
double rpix, theta, rstd, tstd
int i, j, ncols, nlines, ncgrid, nlgrid, npts
double clgetd()
int clgeti()
begin
# Get the image size.
ncols = clgeti ("ncols")
nlines = clgeti ("nlines")
ncgrid = clgeti ("ncgrid")
nlgrid = clgeti ("nlgrid")
# Get the image zero point in pixels.
x_zero = clgetd ("x_zero")
if (IS_INDEFD(x_zero))
x_zero = (1.0d0 + ncols) / 2.0d0
y_zero = clgetd ("y_zero")
if (IS_INDEFD(y_zero))
y_zero = (1.0d0 + nlines) / 2.0d0
xi_zero = clgetd ("xi_zero")
if (IS_INDEFD(xi_zero))
xi_zero = 0.0d0
eta_zero = clgetd ("eta_zero")
if (IS_INDEFD(eta_zero))
eta_zero = 0.0d0
# Get the image scale in " / pixel and the ratio of x to y scales.
scale = clgetd ("scale")
if (IS_INDEFD(scale))
scale = 1.0d0
scale = DEGTORAD (scale / 3600.0d0)
ratio = clgetd ("ratio")
if (IS_INDEFD(ratio))
ratio = 1.0d0
# Get the rotation and ske in degrees.
xrot = clgetd ("xrot")
if (IS_INDEFD(xrot))
xrot = 0.0d0
yrot = clgetd ("yrot")
if (IS_INDEFD(yrot))
yrot = 0.0d0
# Get the assumed image tangent point in hours and degrees.
ra_tan = clgetd ("ra_tan")
if (IS_INDEFD(ra_tan))
ra_tan = 0.0d0
dec_tan = clgetd ("dec_tan")
if (IS_INDEFD(dec_tan))
dec_tan = 0.0d0
cosd = cos (DEGTORAD(dec_tan))
sind = sin (DEGTORAD(dec_tan))
# Get the tangent point error.
dra_tan = clgetd ("dra_tan")
if (IS_INDEFD(dra_tan))
dra_tan = 0.0d0
ddec_tan = clgetd ("ddec_tan")
if (IS_INDEFD(ddec_tan))
ddec_tan = 0.0d0
# Get the tilt error.
tra = clgetd ("tra")
if (IS_INDEFD(tra))
tra = 0.0d0
tdec = clgetd ("tdec")
if (IS_INDEFD(tdec))
tdec = 0.0d0
# Get the cubic distortion term
q1 = clgetd ("q3ra")
if (IS_INDEFD(q1))
q1 = 0.0d0
q2 = clgetd ("q3dec")
if (IS_INDEFD(q2))
q2 = 0.0d0
q3 = clgetd ("q3")
if (IS_INDEFD(q3))
q3 = 0.0d0
# Compute the x and y grid.
xstep = (ncols - 1.0d0) / (ncgrid - 1.0d0)
ystep = (nlines - 1.0d0) / (nlgrid - 1.0d0)
npts = 0
y = 1.0d0
do j = 1, nlgrid {
x = 1.0d0
do i = 1, ncgrid {
npts = npts + 1
xpix[npts] = x
ypix[npts] = y
dxi[npts] = 0.0d0
deta[npts] = 0.0d0
x = x + xstep
}
y = y + ystep
}
# Compute the linear part of the plate solution.
do i = 1, npts {
xi[i] = xi_zero + scale * (xpix[i] - x_zero) *
cos (DEGTORAD(xrot)) - scale * ratio * (ypix[i] - y_zero) *
sin(DEGTORAD(yrot))
eta[i] = eta_zero + scale * (xpix[i] - x_zero) *
sin(DEGTORAD(xrot)) + scale * ratio * (ypix[i] - y_zero) *
cos(DEGTORAD(yrot))
}
# Estimate the tilt terms.
dra = DEGTORAD(tra / 60.0d0)
ddec = DEGTORAD(tdec / 60.0d0)
c1 = cosd * dra
f1 = ddec
do i = 1, npts {
ddxi = c1 * xi[i] ** 2 + f1 * xi[i] * eta[i]
ddeta = f1 * xi[i] * eta[i] + c1 * eta[i] ** 2
dxi[i] = dxi[i] + ddxi
deta[i] = deta[i] + ddeta
}
# Compute the components of the centering error.
dra = DEGTORAD(dra_tan / 60.0d0)
ddec = DEGTORAD(ddec_tan / 60.0d0)
c1 = cosd * dra
b1 = sind * dra
f1 = ddec
do i = 1, npts {
ddxi = c1 - b1 * eta[i] + c1 * xi[i] ** 2 + f1 * xi[i] *
eta[i]
ddeta = f1 + b1 * xi[i] + f1 * eta[i] ** 2 + c1 * xi[i] *
eta[i]
dxi[i] = dxi[i] + ddxi
deta[i] = deta[i] + ddeta
}
# Compute the radial distortion terms
dra = DEGTORAD(q1 / 60.0d0)
ddec = DEGTORAD(q2 / 60.0d0)
c1 = -cosd * dra * q3
f1 = -ddec * q3
do i = 1, npts {
ddxi = c1 * (3.0d0 * xi[i] ** 2 + eta[i] ** 2) + 2.0d0 * f1 *
xi[i] * eta[i] + q3 * xi[i] * (xi[i] ** 2 + eta[i] ** 2)
ddeta = 2.0d0 * c1 * xi[i] * eta[i] + f1 * (xi[i] ** 2 + 3.0d0 *
eta[i] ** 2) + q3 * eta[i] * (xi[i] ** 2 + eta[i] ** 2)
dxi[i] = dxi[i] - ddxi
deta[i] = deta[i] - ddeta
}
# Estimate the refraction and aberration terms.
# Compute the cubic distortion correction.
# Do the correction
do i = 1, npts {
xi[i] = xi[i] + dxi[i]
eta[i] = eta[i] + deta[i]
}
# Print the results.
do i = 1, npts {
rpix = sqrt ((xpix[i] - x_zero) ** 2 + (ypix[i] - y_zero) ** 2)
if (ypix[i] == y_zero && xpix[i] == x_zero)
theta = 0.0d0
else
theta = RADTODEG(atan2 (ypix[i] - y_zero, xpix[i] - x_zero))
#if (theta < 0.0d0)
#theta = theta + 360.0d0
rstd = sqrt ((xi[i] - xi_zero) ** 2 + (eta[i] - eta_zero) ** 2)
if (eta[i] == eta_zero && xi[i] == xi_zero)
tstd = 0.0d0
else
tstd = RADTODEG(atan2 (eta[i] - eta_zero, xi[i] - xi_zero))
#if (tstd < 0.0d0)
#tstd = tstd + 360.0d0
call printf ("%12g %12g %12g %12g %12g %12g %12g %12g\n")
call pargd (xpix[i])
call pargd (ypix[i])
call pargd (RADTODEG(xi[i]) * 3600.0d0)
call pargd (RADTODEG(eta[i]) * 3600.0d0)
call pargd (rpix)
call pargd (theta)
call pargd (RADTODEG(rstd) * 3600.0d0)
call pargd (tstd)
}
end
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