It was not until the 20th century that Pei Xiu's third century assessment of earlier maps' dismal quality would be overturned and disproven. The makers of the Han maps were familiar with the use of scale, while the Qin map makers had pinpointed the course of rivers with some accuracy.
It wasn't until the 20th century that Pei Xiu's third-century critique of earlier maps' inadequacy was refuted and superseded. In contrast, the Han cartographers were skilled in utilizing scale, whereas the Qin mapmakers showed some precision in charting river routes.