Countour plot based on velocity data

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JACK LONDON
JACK LONDON 2022-12-24
编辑： JACK LONDON 2022-12-25
I have data consist of X(x coordinate) Y(y coordinate) Z(velocity). I created below countour plot with especial flow software as below:
I try to plot countour in matlab with below code but it gives wrong results.
xyz=dlmread('velocity.txt');
x=xyz(:,1);
y=xyz(:,2);
z=xyz(:,3);
[X,Y]=meshgrid(min(x):max(x),min(y):max(y));
Z=griddata(x,y,z,X,Y);
contourf(X,Y,Z)
Which code I need to create velocity countour similar to first image? Thank you.
Note: I uploaded my data as an attachment.

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Voss
Voss 2022-12-24
Ran in:
The x and y don't quite make a grid (a point is missing in the upper-left corner near (0,2)):
xyz = readmatrix('velocity.txt');
plot(xyz(:,1),xyz(:,2),'.')
so it's most convenient to use a scatteredInterpolant:
I = scatteredInterpolant(xyz(:,1),xyz(:,2),xyz(:,3));
[x,y] = meshgrid(unique(xyz(:,1)),unique(xyz(:,2)));
contourf(x,y,I(x,y))
colorbar

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