Working with irregularly spaced gridded NetCDF data in R

How to read a NetCDF file in R?

You can read netCDF data in R using the ncdf4 package. You can use the nc_open function from the ncdf4 package to open a connection to a netCDF file.
 

How to extract data from NetCDF file using R?

How to convert NetCDF to CSV using R?

1. Install ncdf4 and lubridate packages.
2. Load your NetCDF file.
3. Extract the coordinates.
4. Time conversion.
5. Extract the variables.
6. Export result as CSV.

How to create a NetCDF file in R?

In this set of example code, an R data frame is reshaped into an array that can be written out as a netCDF file.



4.1 Convert a “full” R data frame to an array

1. 1 Initial set up – create dimension variables.
2. 2 Reshaping a “full” data frame to an array.
3. 3 Check the conversion.

What is NetCDF used for?

NetCDF (network Common Data Form) is a file format for storing multidimensional scientific data (variables) such as temperature, humidity, pressure, wind speed, and direction. Each of these variables can be displayed through a dimension (such as time) in ArcGIS by making a layer or table view from the netCDF file.

Is netCDF a raster or vector?

ArcGIS currently supports three multidimensional raster types—GRIB, HDF, and NetCDF—which correspond to multidimensional raster data stored in those formats.

How do I read netCDF data?

To read a netCDF file of known structure, you need to:

1. open the file – Specify the file name and whether you want read-write or read-only access.
2. read variable or attribute data – Read the data or attributes of interest.
3. close the file – Release all resources associated with this file.

How do I convert NC to CSV?

One file conversion (specifying a filename)



We set some variables to get the input netcdf_file_name, its path and the output csv_file_name and path. We open the netcdf file (using open_dataset() method), convert it to a dataframe ( to_dataframe() method) and write this object to a csv file ( to_csv() method).

Are netCDF files compressed?

NetCDF compression is lossless: the data is exactly as it was when read from disk. It can still be read using the same programming interface.
 

How can I tell what format my netCDF file is?

In a program, you can call the function nc_inq_format(or nf90_inq_format for the Fortran-90 interface) to determine the format variant of an open netCDF file.

How do I convert NC to CSV?

One file conversion (specifying a filename)



We set some variables to get the input netcdf_file_name, its path and the output csv_file_name and path. We open the netcdf file (using open_dataset() method), convert it to a dataframe ( to_dataframe() method) and write this object to a csv file ( to_csv() method).

How do I open .NC files in GrADS?

Reading NetCDF and HDF Files with GrADS

1. Use the sdfopen command to open the file. This requires the least amount of effort for the user — simply provide the file name (or an OPeNDAP URL) and GrADS does the rest.
2. Use the xdfopen command to open the file.
3. Use the open command to open the file.

Is netCDF a raster?

Using the Make NetCDF Raster Layer tool from the Multidimension Tools toolbox, you can create a raster layer from a netCDF variable. The output raster layer can be used in other tools that accept rasters as input for further analysis.