Unable to add coastlines to SST plot

Im currently using MATLAB R2022a and trying to add coastlines to my SST plot.I have tried everything load coast, load coastlines, coast.mat but not working. The file just not exists , please tell me how to add coastlines to my plot.

[MJFcoNaN]

Hello, you should post your code and a sample of data.

There are many toolbox or built-in function to do it.

Answer 1

[Chunru]

unzip('sst_data.zip')
%dir
filename="sst_data.cdf";
%ncdisp(filename);
long=ncread(filename,'COADSX');
lat=ncread(filename,'COADSY');
sst=ncread(filename,'SST');
sst_march=sst(:,:,3:3);
imagesc(long,lat,sst_march')
colorbar
load coastlines
hold on
%borders
plot(wrapTo360(coastlon), coastlat, 'r.', 'MarkerSize', 2);
axis xy

[Chunru]

When you "load coastlines", you read in variable coastlon and coastlat. The variable coastlon has range from -180 to 180 deg while the netcdf you have lon range from 0 to 360 deg. So you need to wrap around the lon data.

[Chunru]

You are haveing the whole world map (check out the range of lon and lat) and you can just zoom into any part in the plot. The coastlines data (default in matlab) is of coarse resolution. Note also that coast lines only specify the coast lines and it does not give the country boundaries. For showing country boundaries, you need to read other map data.