modify multiple netcdf files into one

I have several files in netcdf and I want to join them to form one.

Does anyone have any ideas?

Answer 1

[Manish]

Hi,

I understand that you want to combine multiple NetCDF files into a single NetCDF file. You can achieve this by following these steps:

1. Use ‘nccreate’ to create an output file.
2. Use ‘ncread’ to read data from each of the input files.
3. Cumulatively write the data into the output file using ‘ncwrite’.

Here is the code implementation of the above steps:

% The code creates 3 NetCDF Files and combine them.
numFiles = 3;
dimSize = 10;
% Step 1: Create Multiple NetCDF Files
for i = 1:numFiles
    filename = sprintf('test_file_%d.nc', i);
    nccreate(filename, 'data', 'Dimensions', {'x', dimSize, 'y', dimSize})
    data = rand(dimSize, dimSize);
    ncwrite(filename, 'data', data);
end

% Step 2: Combine NetCDF Files into One
outputFile = 'combined_file.nc';
% 'data' is the variable name in the NetCDF file
nccreate(outputFile, 'data', 'Dimensions', {'x', dimSize, 'y', dimSize, 'file', numFiles});
for i = 1:numFiles
    filename = sprintf('test_file_%d.nc', i);
    data = ncread(filename, 'data');
    ncwrite(outputFile, 'data', data, [1, 1, i]);
end

You can refer to the documentations for the functions used:

• nccreate: https://www.mathworks.com/help/matlab/ref/nccreate.html
• ncread: https://www.mathworks.com/help/matlab/ref/ncread.html
• ncwrite: https://www.mathworks.com/help/matlab/ref/ncwrite.html

Hope this helps!