Inserting black lines on pcolor plot

2022 9 4
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I have a matrices of values which I want to use to create a pcolor plot.
My data is constrained by water depths where I have set all depth >100m to NaN and all values of 0 to NaN.
This has created a confusing plot where I'm unable to show coastal outlines properly.
How would I change this plot so that I retain my '0 depth' or land values but create a black outline that will clearly show the outline of the coasts.
Thanks.

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KSSV
KSSV 2022-9-4

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You can use contour.
Let X, Y, H be your data of (x,y) coordinates and H be your depth.
figure
hold on
pcolor(X,Y,H)
shading interp
contour(X,Y,H,[0 0],'k')

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Charlie Milford
Charlie Milford 2022-9-4
Thank you for your answer it works perfectly and will use in future. I ended up using the m_map addon and imported a coastal data zip file in the end.

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