1. This paper proposed a nighttime light economy index (NLEI) to investigate the urban NTE level

2. Data: DMSP/OLS Nighttime Light Data
? ? ? ? ? ? ? The administrative boundary maps, Land use/land cover data (http://www.resdc.cn/)

3. Methods
? ? 3.1 Extraction of Built-up Area
? ? ? ? ? Method: threshold technique
? ? 3.2 ?The Compound Night Light Index (CNLI)
? ? ? ? ? ? ??

3.3. The Urban Night Light Economy Index (NLEI)
? ? ? ??