I am not sure yet if this is the way to go. Because we have this invisible border. Rather, we should substract 2 of these, and let the map data start from the map inside the border. Ie, we have a width and height of 62 here and have the map data also have that. 

From the player perspective this would still seem to be that 001=xxx starts from upper-left in his map, but technically it started at 1,1 instead of 0,0