Please tell me that's not your channel, otherwise I might have to scold you for not giving us a slow overview of that map's detailing!
You might know (or not) that back in the 80s, Nintendo Power magazine had a promotion where they gave you a free copy of Dragon Warrior with a full subscription, which is how I obtained the game. I'm intimately familiar with this map, enough so that it took me only as few seconds to realize the map wasn't oriented properly for the majority of the video. I *really* wish we had gotten a better closeup of it because the way they handled altitude seemed really cool.
In any case, thanks for sharing!