Both the Tang and Song dynasties tried to deal with a “land problem.” What was this problem and how did both dynasties try to solve it? Were they successful?

i just did something on this guy a few days a go give me two minutes to find it in my notes.

where is the

map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground. for example, on a 1: 100000 scale map, 1cm on the map equals 1km on the ground.