read that they were declared to be thousands of years old. I'm guessing carbon-dating, however I am really interested to see if any radiometric dating was done on it.
It would have changed this country's future from what it was! There is a spattering of information that has survived concerning world maps.
Chinese appear to have been among those who were mapping the world at that time - a mapping project which included North and South America as well as Antarctica - and some of whose maps were later copied by Piri Reis. But this does not explain the other 99% of sophisticated technology found in the ruins of ancient civilizations.
China (founded a few centuries after the Great Flood) was just a portion of a vastly bigger picture.
Evidence suggests that the major factor was a sudden climate change (this would require a lengthy explanation which is a topic for the future) - being an aftermath of the Flood.
or is this most likely the result of the earth shift during the flood?
The 'Topkapi' map of Piri Reis that you referred to, is actually compiled from ancient Chinese maps now in Beijing museum and not from some mysterious ancient culture.