The activities leading to these results have been contracted by Mercator Ocean International, operator of CMEMS on behalf of the European Union. This document has been produced in the context of the Copernicus Marine Environment Monitoring Service (CMEMS). Through a chat session available in the bottom right corner of the page If you are facing any issue about any step of this article, then feel free to contact us: How to automate a series of MOTU downloads with R?įeel free to share your feedback with us! How to subset and download Copernicus Marine data in R? How to access and subset data via OPeNDAP with R? In the Copernicus Marine User Learning Services, you will find another tutorial and a script in R proposed during the 2021 Copernicus Marine Service MarineData4America Training Workshop.įinally, for further reading, here are some more articles: The dim() function will list the number of variables values: nlon <- dim(longitude)Ĭongratulations! You have opened and plotted your first map in R! 👏 Once the NetCDF file opened, you can read coordinates variables, according to the position of the dimensions: longitude <- nc_file$dim]$vals nc file, just call the names() function: names(nc_file) Global attributes (title, history, source, references, etc.) Nc_file <- nc_open('CMEMS-MEDSEA_006_013-bottomT_thetao-2020.nc')Īll information about the product will be listed:ĭimensions (4D - depth, longitude, latitude, time) To open the NetCDF file, call the nc_open function, from the ncdf4 package: #set the working directory and filename Setwd: define the working directory, where the files were downloaded and saved The first step is to open the NetCDF file you previously downloaded, by setting some temporary variables: We will plot here the sea temperature ( thetao) for the MEDSEA_ANALYSISFORECAST_PHY_006_013 product. Let's see now an example of data visualization script code. You must then load the different libraries in your script to use them: library(ncdf4) 📌 Note: supplementary information and detail about R packages can be found in the official Rdocumentation website.

Working with net cdf files in r