Learning R - Handling NetCDF files

Handling NetCDF files

http://tinyurl.com/LearningR-NetCDF

José Roberto Motta Garciagarcia.cptec@gmail.comMay 3, 2023

Leaning

José Roberto M. Garcia Dec-16Handling NetCDF files

NetCDF file

• Network Common Data Form• Stores data in matrix format (grid), e.g., climate data• Self-documented → metadata inside• Portable • Created by Unidata http://www.unidata.ucar.edu/software/netcdf/ (UCAR)• Handling NetCDF with R → RNetCDF package

Visualizing NetCDF via sfwhttp://www.giss.nasa.gov/tools/panoply/

Visualizing NetCDF via R

José Roberto M. Garcia Dec-16Handling NetCDF files

Reading NetCDF file

# of dimensions, e.g., lon, lat, time, ...

# of variables, e.g., lon, lat, time, temp, ...

# of global attributes, e.g., title, source, ...

# ID of the unlimited dimension or NA

José Roberto M. Garcia Dec-16Handling NetCDF files

More on NetCDF info

variable's attributes

José Roberto M. Garcia Dec-16Handling NetCDF files

NetCDF variable content

It's a monthly dataset, so there are 12 months!

José Roberto M. Garcia Dec-16Handling NetCDF files

Reading variables and attributes

José Roberto M. Garcia Dec-16Handling NetCDF files

Plotting data

José Roberto M. Garcia Dec-16Handling NetCDF files

Creating attributes

Defines global attributes

Defines attributes of existing variables