Originally posted by Aaron28 neat....have always wanted to do one of these....is photoshop necessary to do it??
Not sure, but using Photoshop is how I learned to do it.
Make a 360 degree panorama.
Turn it upside down.
Change the image dimensions so they are the same height and length wise. Be sure to deselect Constrain Proportions.
Change it to 8 bits/channel.
Go to Filter>Distort>Polar Coordinates, be sure Rectangular to Polar is selected, and click OK.
The result will have empty corners, so you can either use the Content Aware fill tool, clone in the empty space, or if there is room, simply crop it down to eliminate the empty corners. I did the latter on this one, as the sky occupied a large portion of the final result. On most of my attempts I have had to use the fill tool or clone in the corners.
Not sure if the freeware opensource Gimp has similar tools, but it might.