Learn a way to handle NetCDF files.

1. Handling
NetCDF files
http://tinyurl.com/LearningR-NetCDF
José Roberto Motta Garcia
garcia.cptec@gmail.comDec-16
Leaning

2. 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 sfw
http://www.giss.nasa.gov/tools/panoply/
Visualizing NetCDF via R

3. 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

4. José Roberto M. Garcia Dec-16Handling NetCDF files
More on NetCDF info
variable's attributes

5. José Roberto M. Garcia Dec-16Handling NetCDF files
NetCDF variable content
It's a monthly dataset,
so there are 12
months!

6. José Roberto M. Garcia Dec-16Handling NetCDF files
Reading variables and attributes

7. José Roberto M. Garcia Dec-16Handling NetCDF files
Plotting data

8. José Roberto M. Garcia Dec-16Handling NetCDF files
Creating attributes
Defines global
attributes
Defines attributes of
existing variables