How to extract perticular variable from multiple netcdf files (daily data). And merge them together as a one .mat file.

I have sst daily data in .netCDF format from 1990 to 2020. some files have 365 days, some have 366. How can I extract sst variable from each file and make a one single .mat file.

Then how can I calculate climatalogy for each day for 31 years.

file ='sst.day.mean.1990.nc'

following figure shows the 'sst' variable.

I hope to have final .mat file as

total (at least) = '1440*720*11315'

Answer 1

[Asvin Kumar]

I'm not sure if there is a single function to do that. Here are some functions you can use to create a script for yourself.

1. ncread to read from you NetCDF files.
2. dir function with the dir name syntax to get a list all the files in your folder.
3. save to save the data that has been read into a MAT File.

You can concatenate the matrices along the third dimension before saving them. Admittedly, it will be a large matrix. You can explore tall arrays and other options mentioned on this page about handling Large Files and Big Data.

[Dushantha Sandaruwan WIJENDRA NAIDHELAGE]

Thank you very much for your kind advice, i could able to extract . But as you mentioned , i faced a system error due to insufficient memory.I will follow the mentioned path for handling the matrix . Thanks again