Plotting coastlines at different levels in a 3D plot

I have a 3D plot of Cloud Top Pressure. I need to plot coastline at the base of this 3D plot. But since CTP decreases with height, when I plot (>> load coast), the map lies above the 3D plot. How do I modify it so that the my coastlines lie below the CTP. Image for reference.

Code:

for j = 1:8
     
    CTP_a = reshape(CTP(j,:,:),159,155);
    surf(LON,LAT,CTP_a)
 
    hold on
    shading interp 
    az = -28;
    el = 75;
    view(az, el);
    set(gca,'YLim',[0 35],'tickdir','out','ytick',[0:10:30],'yticklabel',[{'Eq','10^oN','20^oN','30^oN'}],'Fontweight','bold')
    set(gca,'XLim',[60 90],'tickdir','out','xtick',[60:10:90],'xticklabel',[{'60^oE','70^oE','80^oE','90^oE'}],'Fontweight','bold')
    set(gca,'Zdir','reverse')    
    colormap (jet(50))
    colorbar vert
    caxis([0 1000])
    load coast
    plot(long,lat,'-k')
    
 end

Answer 1

[Bjorn Gustavsson]

Since you've selected to set zdir to 'reverse' your coastline-plot might look better something like this:

z_bottom = max(get(gca,'ZLim'));
plot3(long,lat,z_bottom*ones(size(lat)),'k')

HTH

[Arun Nair]

It worked. Thanks!