Sudheer Keshav Bhat · December 25, 2020
CDO (Climate Data Operators) is a set of command line Operators to manipulate and analyse Climate data. netCDF 3/4 is one of the supported formats which we demonstrate here.
NCView is a visual browser for netCDF format files. It runs on UNIX platforms under X11.
ncdump command-line utility converts netCDF data to human-readable text form.
Extract a subset of dataset. In this case, selecting months 6-9 and writing to a file.
cdo -f nc4 -selmon,6/9 Rainfall.nc Summar_Rainfall.nc
Calculate yearly mean
cdo -f nc4 -yearmean Summar_Rainfall.nc year_mean.nc
Trend analysis / linear regression
cdo -f nc4 trend year_mean.nc trend1.nc trend2.nc
Export .nc to .tsv
cdo outputtab,year,lon,lat,value year_mean.nc > year_mean.tsv
Dump info about a dataset (similar to pandas pd.head())
ncdump -h Rainfall.nc
Dump detailed info about specific variable
ncdump -t -v lat Rainfall.nc
ncdump -t -v time Rainfall.nc
Open ncview with a dataset.
ncview Summar_Rainfall.nc