从CHELSA下载气象数据

海拔数据下载

http://edcintl.cr.usgs.gov/downloads/sciweb1/shared/topo/downloads/GMTED/Grid_ZipFiles/mn30_grd.zip

CHELSA提供的19个Bioclimate 数据下载

https://www.wsl.ch/lud/chelsa/data/bioclim/integer/

各环境变量

Bio1 = Annual Mean Temperature 年均温 

Bio2 = Mean Diurnal Range，即 Mean of monthly (max temp - min temp) 平均月温差 

Bio3 = Isothermality 等温性

Bio4 = Temperature Seasonality 温度的季节性 

Bio5 = Max Temperature of Warmest Month 最暖月最高温 

Bio6 = Min Temperature of Coldest Month 最冷月最低温 

Bio7 = Temperature Annual Range 气温年较差 

Bio8 = Mean Temperature of Wettest Quarter 最湿季均温

Bio9 = Mean Temperature of Driest Quarter 最干季均温 

Bio10 = Mean Temperature of Warmest Quarter 最暖月均温 

Bio11 = Mean Temperature of Coldest Quarter 最冷月均温 

Bio12 = Annual Precipitation 年降水 

Bio13 = Precipitation of Wettest Month 最湿润月降水 

Bio14 = Precipitation of Driest Month 最干旱月降水 

Bio15 = Precipitation Seasonality 气温的季节性 

Bio16 = Precipitation of Wettest Quarter 最湿润季降水 

Bio17 = Precipitation of Driest Quarter 最干旱季降水 

Bio18 = Precipitation of Warmest Quarter 最暖季降水 

Bio19 = Precipitation of Coldest Quarter 最冷季降水

CHELSA气候图层， 选择整数还是浮点数图层？

可选择整数图层 integer ，这是因为整数图层占用空间较小， 同时也有相对较高的精度， 如温度可精确到0.1度。 注意，这里的温度是*10的值， 也就说，某地年均温为15.2度， 则提取出的数值为152。