Why don't you just make a savestate while on the overworld and open up VSNES? That would probably let you discover a large amount of information very quickly. That's what I would do. That program is a great time saver when trying to figure out how a screen is put together. The only thing it can't handle is certain HDMA effects for obvious reasons. Mode7 should be covered and covered well though.
apparently i wasn't very clear in what exactly i was doing sorry.
i am taking someone else's PNG dump of the sd2/som mode7 overworld and tearing it into unique tiles, palette, etc. ripping as 4x4's in order to later make 2x2 combos of 4x4's in order to verify the accuracy of their dump.
reason i am using 4x4's is objects like trees, waves, cannons, houses, bridges, mountain, grassland, are all in 4x4 sections embedded within a set of 8x8 tiles.
reason i am ripping as 4x4's from the dump they already made is so i can compare 4x4 sections (unique objects with unique color rotation) in order to verify whether the entire mode 7 dump was made using the same frame of animation for the whole overworld or not, and if not, create a new dump from it where it shows each 8x8 cell with the correct palette per frame timing info.