Make coastline contour from DEM (3d matrix)

Hello,

I have a DEM, 3d matrix with elevation coordinates depending on the xy location. I would like to create a plot (or matrix it doesn't really matter) of the coastline. The goal is to plot temperature of the area with the coastline on top of it.

I tried the different 'contour' functions but they all give me horrible results. I thought to use the imcontour function, but then I lose the 330x300 dimension of the matrix when I save the image.

Does somebody have any idea about what I could do to create this contour plot ?

Have a nice day and thank you !

Answer 1

[KSSV]

[c,h] = contour(dem,[0.5 0.5]) ; 
% filter c 
idx = c(1,:)<1 ; 
c(:,idx) = NaN ; 

figure
pcolor(dem) ; 
shading interp ; 
hold on
plot(c(1,:),c(2,:),'r')

[V.D-C]

Hello, thank you for your answer ! It's almost what I want but there is an issue with the plotting:

[KSSV]

Edited the answer.

[V.D-C]

Thank you very much !!