learning r - handling netcdf files
TRANSCRIPT
Handling NetCDF files
http://tinyurl.com/LearningR-NetCDF
José Roberto Motta [email protected] 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