Terrain at spawn and around it was simply reset and replaced with another biome. Unsure if it was caused during 1.6.2 when the map was first created but it did destroy half my spawn village, some supply roads for horses, and regenerated loads of terrain. Not a simple terrain reset and regeneration, it goes quite a long way in both east and west.
(Possible helpful information)
It is an SMP server hosted by a friend. I once renamed it from "World" to "Vanfer" to give it a proper name for rendering maps. It also transitioned from 1.6.2 into 1.6.4 with the terrain around spawn simply regenerating. Nothing else really regenerated. Only new chunks spawned some odd new chunks on the "Vanfer" name, not the world or so I'm assuming.
I'm pretty sure that leaving the world name as is or renaming shouldn't have done anything that drastic, nor should it have regenerated existing terrain. My guess is something happened in 1.6.2 or 1.6.4 is to blame.
(I did a search but didn't find anything exactly as this one. Maybe I'm blind or maybe one wasn't even added in the same version as my issue.)
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Attachment:
First image is an untouched and new spawn settlement with the rest being terrain being regenerated. Half of it was ocean and the other half a frozen wasteland.
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Different seed, as in when I had it renamed to make it easier to find for map rendering? Even so, it shouldn't eat away at old chunks making new ones, or from what I know from hosting private maps before. The new seed that spawned in unexplored chunks makes sense, not how it reformed terrain at spawn for a good distance (2 minutes flight or horse in either direction.). Even renaming it shouldn't have that much on an effect, should it? Already formed chunks shouldn't regenerate even if you screw around with simple renaming. I'm confused.
Waiting for my friend to send me the world file so I can restore it with MCEdit and to restore terrain.
it shouldn't eat away old chunks, it only creates the new terrain on new generated ones. Seeds from 1.6 and earlier won't apply to 1.7. Maybe you deleted the spawn chunks in programs like MCEdit. Renaming shouldn't be a problem at all, only if you renamed the world to an already existing world name, or even a name you used for a deleted world.
I haven't touched MCEdit, only renamed and had the server files show the change with the "Vanfer" name. That's all. I was then alerted by my friend possibly days after it had changed, glitched, bugged, or whatever did happen. MCEdit wasn't used and shall be now in an attempt to restore.
(This comment aimed at Galaxy_2Alex.)
Then the chunks might have been corrupted and regenerated. Don't ask me why, I really have no idea, I'm sorry.
I'm just trying to explain why the terrain that generated is different than the previous one. At present I have no explanation as to why this occurred.
Resolving all "Chunk restore" tickets to MC-32418.
What doesn't make sense to me is that the terrain generator hasn't changed between 1.6.4 and 1.6.2, meaning that the new chunks that are generated are likely from a different seed. Your problem could very well be caused by having renamed the world files.