How do i use datasets from ecmwf?

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Emmeirrt 2024-1-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2075486-how-do-i-use-datasets-from-ecmwf

编辑： Karanjot 2024-2-8

ecmwf.zip

Hi,

I want to learn more about matlab so i reached out one of my professors. And he told me we can make a comperason with data from "ecmwf" and his own measurement.

I cannot contact my proffessor atm. and i have a lot of free time between semesters. Can andbody guide me on how can i plot these files?

Not even sure if these files are coorect so here is the link to the ecmwf open database.

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Answer 1

Karanjot 2024-2-6

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https://ww2.mathworks.cn/matlabcentral/answers/2075486-how-do-i-use-datasets-from-ecmwf#answer_1403591

编辑：Karanjot 2024-2-8

在 MATLAB Online 中打开

Hi Emmeirrt,

First of all, Since you are new to MATLAB, I recommend exploring MathWorks' Self-Paced Courses. For instance, to get started with the MATLAB language and environment, Consider completing the MATLAB Onramp:

https://matlabacademy.mathworks.com/details/matlab-onramp/gettingstarted

Now, The ecmwf data seems to have files in the GRIB and INDEX format. To import GRIB Files into MATLAB, You may use NetCDF/GRIB reader from File Exchange or NCTOOLBOX. These offer a collection of functions to read GRIB and netCDF files.

Here is an example using NCTOOLBOX:

%Sample data obtained from ftp://polar.ncep.noaa.gov/pub/history/waves/multi_1.at_4m.dp.200607.grb2
% create ncgeodataset object
nc=ncgeodataset('multi_1.at_4m.dp.200607.grb2');
% list variables
nc.variables
% create geovariable object
dirvar=nc.geovariable('Primary_wave_direction_degree_true_surface');
% get data at 1st time step
dir=dirvar.data(1,:,:);
% get grid at 1st time step
g=dirvar.grid_interop(1,:,:);
% plot
pcolorjw(g.lon,g.lat,dir);
title(datestr(g.time))