CDO使用简介（一）
作者：第八星系-李智
邮箱：lizhi258147369@163.com
1.1查看变量
!cdo vardes nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
!cdo：表示需要使用cdo这个工具;
vardes：表示执行的操作：VARiable DEScription;
nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc：表示需要执行的对象。
1.2查看格网griddes：grid description
!cdo griddes nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
1.3展示文件时间
!cdo showtimestamp nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
1.4数据求和输出结果
对nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc每年的12个月数据求和，结果输出到nbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
!cdo yearsum nbp_Lmon_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc nbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
!cdo showtimestamp nbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
1.5 info 查询统计
!cdo infonbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
1.6-h 查看 函数的详细帮助
!cdo -h yearsum
假如我们当记不清具体函数时，只记得year,也可以查找所有包含year的函数。
!cdo -h year
1.7 裁剪小区域
裁剪小区域 sellonlatbox：lonmin lonmax latmin latmax
sellonlatbox 最小经度，最大经度，最小纬度，最大纬度。
!cdo sellonlatbox,100,125,25,30 nbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc nbp_small_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
!cdo infonbp_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
!cdo griddes nbp_small_year_CanESM5_hist-aer_r11i1p1f1_gn_185001-202012.nc
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