Table 1 Data sources and processing of environmental and socioeconomic factors
Variables/description | Data processing | Data source |
|---|---|---|
Mean temperature | Mean temperature from 2010 to 2014 (April–November) in each grid | China Meteorological Data Service Center (CMDC, http://data.cma.cn/) |
Mean precipitation | Mean precipitation from 2010 to 2014 (April–November) in each grid | |
Mean relative humidity | Mean relative humidity from 2010 to 2014 (April–November) in each grid | |
Vegetation index | Mean normalized difference vegetation index (NDVI) from 2010 to 2014 (April–November) in each grid | |
Land use | According to the land use coverage classification system of the Data Center for RESDC, land use data in 2010 were divided into cultivated land, forest land, grass land, water areas, urban land, rural residential areas, other construction land, and unused land. Statistics on the proportion of various land use areas in the grid | Resource and Environmental Science Data Center of the Chinese Academy of Sciences (RESDC, www.resdc.cn) |
Population size | Summing the population (persons) for each grid based on the 2010 population density data | |
Economic conditions | Summing the gross domestic product (GDP) values (RMB) for each grid based on the 2010 GDP data | |
Road density | Summing the road density (km/km2) for each grid based on the road network data in 2010 | OpenStreetMap (http://download.geofabrik.de/) |