|Green = tech 5. Blue = tech 6. Purple = tech 7.|
I don't know if I'll do this again for higher tech levels - it takes a lot of time. But I did want to play a little with the map, just to highlight at least some of the pattern the tech level ideal makes. Obviously, the above means that most of what's shown is a tech level higher than 7 (except, of course, places where desert exists, appearing white on the map).