pcolor and contour in the same map

Hey all,

My problem is that I want to overlay to a pcolor of velocities in a curvilinear grid, the contour of another array that contains the batimetry ( I just one the line of 0 meters)

When I try just to hold on one figure and plot the otherone, the colorbar change and the contour line doesn't appear.

Thak you in advice,

Miguel.

[Tommy]

Can you provide what you've tried so far?

[Miguel andres]

Yeah, here it is. Where peak_mod_atl and bat_final are 40x144. I want to plot the contour of the coast and some depths.

peak_vel_atl=pcolor(lon,lat,peak_mod_atl);colormap jet; colorbar

peak_vel_atl,EdgeAlpha=0

shading interp

hold on

contour_bat=contour(bat_final,[0,0],'k')

Answer 1

[Ameer Hamza]

This shows an example of overlaying contour and pcolor. You need to use the FaceAlpha property to make the surface make by pcolor transparent

x = linspace(-1,1);
y = linspace(-1,1);

[X, Y] = meshgrid(x, y);
Z = X.^2 + Y.^2;

pcolorData = sin(X) + cos(Y);

figure;
ax = axes();
hold(ax);
c = contour(X, Y, Z);
p = pcolor(X, Y, pcolorData);
p.FaceAlpha = 0.2;
colorbar;

[Miguel andres]

Thak you really much. But my problem is that the datas for the contour and the pcolor are different.

[Ameer Hamza]

I also used different data for both. Are you getting unexpected output?

Answer 2

[Georgy Shapiro]

A simple way to overlay a contour plot over pcolor can be seen from this example

 p=pcolor(peaks(250));shading flat; colorbar; caxis ([-8 8 ])
 hold on
 contour(peaks(150),'k','LineWidth',0.5,'Show','on');

Here the data used in pcolor and contour are different and unrelated. If you wish to highlight your pcolor plot with the same data used for contours you can do it like this

 p=pcolor(peaks(250));shading flat; colorbar; caxis ([-8 8 ])
 hold on
 contour(peaks(250),'k','LineWidth',0.5);