The IMD gridded rainfall can be freely downloaded from http://www.imdpune.gov.in/Clim_Pred_LRF_New/Grided_Data_Download.html

The script is to convert imd .grd gridded rainfall of resolution 0.25 degrees to NetCDF (.nc) format and extract the rainfall for region of interest.

There are 3 steps.

• (i) Creation of control File (.ctl) for each rain file (.grd)
• (ii) Convert .grd to .nc file using CDO tool.
• (iii) Extract the rainfall for region of interest (roi) and dump to .csv

$ for FILE in *.ctl; do OUTPUTFILE=$(echo "$FILE" | awk '{gsub(".ctl",".nc"); print}'); echo $OUTPUTFILE ; cdo -f nc import_binary $FILE $OUTPUTFILE; done