How to create a new NETCDF file with an existing variable?

I have a script in which I produced a 3D variable named "mask3", now I have to create a completely new NETCDF file in which I have to put this variable mask3. How could I do it? Thank you so much

Answer 1

[Gayatri]

Hi Fabrizio,

To create a new NETCDF file and write 3D variable to it, you can use MATLAB's built-in functions for working with NETCDF files.

Here's an example MATLAB script that demonstrates this process:

% Example 3D variable 'mask3' with random data
mask3 = rand(50, 75, 20); % Replace with your actual data

[X, Y, Z] = size(mask3);

% Define the path and name of the new NETCDF file
filename = 'my_new_netcdf_file.nc'; 

% Create a new NETCDF file
ncid = netcdf.create(filename, 'NETCDF4'); 

% Define the dimensions in the NETCDF file
dimidX = netcdf.defDim(ncid, 'X', X); 
dimidY = netcdf.defDim(ncid, 'Y', Y);
dimidZ = netcdf.defDim(ncid, 'Z', Z);

% Define the variable in the NETCDF file. Here we assume the data type of mask3 is double
varid = netcdf.defVar(ncid, 'mask3', 'double', [dimidX, dimidY, dimidZ]);

% Leave define mode
netcdf.endDef(ncid);

% Write the data to the variable
netcdf.putVar(ncid, varid, mask3); 

netcdf.close(ncid);  % Close the NETCDF file

This script will create a NETCDF file named "my_new_netcdf_file.nc" in your current MATLAB directory containing the variable "mask3" with the random data.

If you want to verify the contents of the created file, you can use MATLAB's "ncdisp" function:

ncdisp(filename); %This will display the information about the NETCDF file, including dimensions, variables, and attributes.

Please refer the below documentation for "ncdisp" function: https://in.mathworks.com/help/matlab/ref/ncdisp.html

I hope it helps!