Well, it's not like every corn snake comes from the exact same habitat with 8.4 pine trees per acre or anything, so habitat shots are rare because they're pretty pointless.
If what you're looking for are range maps for particular species, get a peterson field guide ($14 US) they show the species range in north america. It also describes the general habitat in words. If you want to know about a specifiy state/province, usually using google with "reptiles of [insert locale here]" will usually give you what you're looking for....
Rome did not build a great empire by having meetings, they did it by killing all who opposed them.