There are 4 distinct images on this DVD

2 are from SHEBA
  -ShebaMosaic0725 is a mosaic  from 25 July 1998 of helicopter photos
  -Sheba17June98 is a grayshade satellite photo where all the leads have been painted black. Just need to pick a threshold between ice and ponds.

2 are from the 2014 ONR Marginal Ice Zone experiment (miz files)
  - for each image there is a raw grayshade file (big file) and a classified version (smaller file) that has been partitioned into components