Human influence intensity index

The human influence intensity (HII) index proposed by Sanderson et al., (2002) was used. We applied a road distance map (https://www.openstreetmap.org/), a grided population density map from 2015 (1 km × 1 km) (https://www.resdc.cn/), nighttime lights from 2018 (500 m × 500 m) (https://dataverse.harvard.edu/) (Chen et al., 2020) and land use data from 2020 (30 m × 30 m) (http://www.globeland30.org/) to generate the HII at 500 m × 500 m. We assigned scores to population density, roads and railways, land use/ cover, which were summed to quantify the HII, which ranges from 0.05 to 30本研究采用Sanderson等人（2002）提出的人类影响强度（Human Influence Intensity, HII）指数。研究借助OpenStreetMap提供的道路距离图（https://www.openstreetmap.org/）、2015年1km×1km格网人口密度图（https://www.resdc.cn/）、2018年500m×500m夜间灯光数据（哈佛大学数据仓储，https://dataverse.harvard.edu/，Chen等，2020）以及2020年30m×30m土地利用数据（Globeland30，http://www.globeland30.org/），生成了分辨率为500m×500m的HII数据。本研究对人口密度、道路与铁路、土地利用/覆被进行打分赋值，将各分项得分求和以量化人类影响强度指数，该指数的取值范围为0.05至30。