Global Database of Light-based Geospatial Income Inequality (LGII) Measures, Version 1

The Global Database of Light-based Geospatial Income Inequality (LGII) Measures, Version 1 data set contains Gini-coefficients of inequality for 234 countries and territories from 1992 to 2013. The measurement Unit is the Gini-Coefficient (Range: 0-1), with higher values representing higher inequality. These measures are constructed using worldwide geospatial satellite data on nighttime lights emission as a proxy for economic prosperity, matched with varying sources of data on geo-located population counts. The nighttime lights data were supplied by the National Oceanic and Atmospheric Administration (NOAA), National Centers for Environmental Information (NCEI), Earth Observation Group (EOG), and Operational Linescan System (OLS) instruments. The population data used consisted of CIESIN's Gridded Population of the World (GPW) collection, and the Oak Ridge National Laboratory (ORNL) LandScan (LSC) data set. The nighttime lights and population data were combined to produce an array of geospatially-informed Gini-coefficients, which were then weighted to optimize their correlation with a benchmark - specifically, the Standardized World Income Inequality Database (SWIID), to generate a parsimonious composite inequality metric.

《全球基于光照的地理空间收入不平等数据库（LGII）测量值》第一版数据集收录了1992年至2013年间234个国家和地区的不平等基尼系数。测量单位为基尼系数（范围：0-1），数值越高代表不平等程度越深。这些测量值系利用全球地理空间卫星数据中夜间灯光发射量作为经济繁荣的代理指标构建而成，并与不同来源的地理位置人口数据相匹配。夜间灯光数据由美国国家海洋和大气管理局（NOAA）、国家环境信息中心（NCEI）、地球观测组（EOG）和操作线扫描系统（OLS）仪器提供。所用人口数据包括CIESIN的《全球人口网格化数据集》（GPW）和橡树岭国家实验室（ORNL）的《土地扫描》（LSC）数据集。将夜间灯光和人口数据相结合，生成一系列地理信息化的基尼系数，随后对这些系数进行加权，以优化其与基准——即标准化世界收入不平等数据库（SWIID）的相关性，从而生成一个简明的不平等综合指标。