thanks, guys. the maps are 46.5x66.75 inches. they are composite images made from scraps of aerial and sometimes satellite photography, including some hi-res images of, you guessed it, mars. they were made over the course of 2 years. i used photoshop to morph them into something that makes since with a hex grid over the top of it (the real world has a nasty habit of not conforming to a hex grid). the photoshop files average 1.5 gig in size. the finished jpegs are about 75 meg, and the preview images are around 1 meg apiece.
if you have any other, sensitive questions about them, feel free to email or pm me (i'm pretty sure i'm not supposed to advertise on here, so i won't be posting any links).