EU watch 数据处理基本流程

1. download data from EU watch (I looked for the data for nearly one month... just because of the wrong ftp site...)
2. use R script to make the land vector into a normal 3d array (terrible!)
3. use R script to write netcdf file
4. compress the nc file
   $ ncks -4 -L9 input.nc output.nc
5. use GrADS to resample 0.5 deg to 1.0 deg into control file and binary file
   fwrite use different time settings to put the data into one written file
6. use CDO to convert binary and control files into netcdf again!
   $ cdo -f nc import_binary input.ctl output.nc