This inspired me to revisit some older data and do a similar polar projection. I did so with what I considered to be my finest Saturn from last year's apparition. This image was made on March 11 at 07:35 UT. It is a Baader 685 image made with a TIS DMK21-618 and 15" Newt at f/21. I've got this image as part of a slide show on my laptop background and while working (or not) on a paper happened to see it. With Darryl's image in mind, I was inspired to perform an image measurement and polar projection.
Here is the original image. Next post will be the projection.