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how to turn netcdf into contour map

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I have T2M data plot and want to put it into a contour plot at lat and lon 80.5N and -58W showing T2M over time how do I do this?
I've never used this before
Thanks

Accepted Answer

Chad Greene
Chad Greene on 2 May 2021
Hi Abigail,
The first thing I do with a netcdf file is type
ncdisp('myfile.nc')
to see what's inside it. If you have some variables named latitude, longitude, and T2M, read them in like this:
lon = ncread('myfile.nc','longitude');
lat = ncread('myfile.nc','latitude');
T = ncread('myfile.nc','T2M');
Most of the time with NetCDF's of climate data, you'll have to swap the first two dimensions of any gridded data. That probably looks like this:
T = permute(T,[2 1]);
for 2D data or
T = permute(T,[2 1 3]);
if T is a 3D data cube.
Assuming T is 3D where the third dimension corresponds to time, you could contour the first time slice like this:
contour(lon,lat,T)
But you say you want to show T over time. What exactly do you mean by that?
  1 Comment
Abigail Waring
Abigail Waring on 12 May 2021
Thank you
I managed to get it working but had to rewrite the code

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