Correlations between Huygens and ISS images

Rene Pascal has posted an informative look at correlating features seen by Huygens and features seen by Cassini ISS. While I disagree with his conclusions, I highly doubt that the higher altitude height estimates for DISR images are off by 250%, the exercise is instructive. Knowing how the images presented from ISS were constructed, I find it highly plausable that the "Huygens scale" is accurate and corresponds well with what we have seen in ISS images. Height measurements for Huygens images may only need to be off by as much as 10-20%.