Interpolate scattered values on a regular grid with bi-harmonic interpolation method

Hi mates.

I've got an vector with values and Corresponding x, y vectors.

I would like to interpolate values in an entire study area.

This is my approach:

reservoir(:,1) is the Vector with the x-Values, reservoir(:,2) contains y-Values. '"y" is the vector with the actual measured values at the coordinates.

honestly, I don't know, what 'v4' stands for.

That's, what I get:

And I don't know why.

Any guesses or tips?

Best regrades

Felix

Answer 1

[darova]

Create appropriate mesh

x = linspace(min(reservoir(:,1)),max(reservoir(:,1)),20);
y = linspace(min(reservoir(:,2)),max(reservoir(:,2)),20);
[X,Y] = meshgrid(x,y);
Z = griddata(reservoir(:,1),reservoir(:,2),y,X,Y);
surf(X,Y,Z)

[Felix Ja]

Thank you, that worked. It worked defently in another way as i should do it, but I think thats fine.

Because I'm not realy into it, would it be posible, that you shortly explain to me what did you do?

What is linspace for?

Best

Felix

[darova]

YOu have wrong mesh (surface) because the data is not ordered. Or you create new mesh (as i did) or you order the data

[XI,YI] = meshgrid(sort(reservoir(:,1)),sort(reservoir(:,2)));

[Felix Ja]

got it. Thank you.

Best regrades and have a nice time.

Felix Roth