“…However, compared to DEA AHP, PCA and factor analysis can only be used to measure a single aspect of input or output, and cannot measure ULGUE from the land use system as a whole. Addressing the patterns, trends, and development of ULGUE over time and space, mainly at the scale of cities, there are Yellow River Basin [20], Yangtze River Economic Belt [21], 284 prefecture-level cities in China [22], etc. Regarding the mainly influencing factors of ULGUE, there are environmental regulations [23], regional integration [24], new urbanization [25], economic development level, urban land intensification, ecological environment, governmental behavior, and social development level [26], etc.…”