POLAR will transform the image in the `source' buffer from observed Cartesian coordinates (x,y) to polar coordinates (r,theta) in the `dest' buffer. The transformation assumes that the object is intrinsically round and projected into an ellipse in the sky plane with the given position angle, ellipticity (1-b/a) and center.
The SINC keyword instructs ROUND to use high-accuracy sinc interpolation instead of the default bilinear interpolation algorithm.
The NORM keyword is used to renormalize the pixel intensities (surface brightness/pixel) in the transformed image.
The R=(rmin,rmax) keyword is used to specify the radial limits of the r-axis of the polar deprojection. By default, if R= is not given the r-axis will run from 0 to the maximum semi-major axis of the inscribed ellipse.
See Also: ROUND