CONVERT GRIB TO CSV/MAT

Hello,

I would like to know if there exists anyway to convert GRIB file to CSV/MAT in MATLAB. The GRIB file I downloaded from https://cds.climate.copernicus.eu/cd...e?tab=overview.

Let me know if this can be done in MATLAB

[Stephen23]

https://www.mathworks.com/matlabcentral/fileexchange?q=grib

[SAPTORSHEE KANTO]

I have tried all of them before none of them works for conversion of GRIB to CSV

Answer 1

[Rushikesh]

Hello @SAPTORSHEE KANTO,

I understand that you want to convert GRIB file to CSV file to work on it in MATLAB.

You can use ‘readgeoraster’ function provided by MATLAB Mapping Toolbox which enables you to read geospatial raster data file. Mapping Toolbox supports variety of file formats which includes GRIB file format as well.

Please find below about Mapping Toolbox file format support for reference:

https://www.mathworks.com/help/map/supported-geospatial-file-formats-for-import-and-export.html

You need to have access to Mapping Toolbox and I suggest working in Recent MATLAB versions to get latest support, preferably R2023b or later.

Here is an example of how to use ‘readgeoraster’ function inside MATLAB, I have used same dataset you have referred to with a few variables to demonstrate.

gribFileName = '/1month_anomaly_Global_ea_2t_199101_1991-2020_v02.grib'; 
data = readgeoraster(gribFileName); 
csvFileName = '1month_anomaly_Global_ea_2t_199101_1991-2020_v02.csv'; 
writematrix(data, csvFileName);

I have tested above code in MATLAB 2024a release, and it is giving expected results.

Additionally, you can also use ‘ecCodes’ package provided by ECMWF for reading GRIB file followed by converting it to CSV using Python. MATLAB also provides two-way integration with Python if you want to execute the same in MATLAB.

Disclaimer: Please use this resource at your own discretion as it is from a third party and not supported or validated officially by MathWorks.

You can refer to below the documentation to download and use ‘ecCodes’ package in Python:

https://confluence.ecmwf.int/display/ECC/ecCodes+installation#ecCodesinstallation-Python3bindings

Listed here are the steps to convert GRIB file to CSV file:

https://confluence.ecmwf.int/display/CKB/How+to+convert+GRIB+to+CSV

Let me know if this solution helps.

Answer 2

[Anagha Mittal]

Hi,

To convert from GRIB to CSV, you may refer to the following github repository:

https://github.com/mezorian/grb2ToCSV