Any algorithm exist for sorting contours based on features?

I have to sort data such that inner loops contours should store in one matrix, then second loops and then for third loops. Actually I am able to store data in one matrix for 2 or 3 contours in a same plane but when number of contours changes with plane like at 6th slice there are 2 contours and at 7th slice there are 3 contours my program is unable to sort data contour wise. So how con I differentiate data any idea.

[Mohammad Sami]

How is your original dataset stored ?

Are all these completely inside x-y plane ?

You can just calculate max x and maxy for each contour and z plane that you have

[Image Analyst]

What do you want to sort ON? Like first by z level, then from outside to inside? I have no idea what you want to sort by. Based on "features" - well, what features? Radius? Z???? Saying "sort data contour wise" means absolutely nothing to me. "Contour wise" is not a number that we can sort on. But things like radius or Z or whether it's inside another circle are. In what form are your curves? How did you draw them? Do you have a list of (x,y) coordinates for each of the 37 curves?

[Akshay Sahu]

So here is the picture of curves that have been plotted in a sequence given in figure.

and my data in the matrix in arranged such that

{{1;NaN;2},{3;NaN;4},{5;NaN;6},{7;NaN;8},{9;NaN;10;NaN;11},{12;NaN;13;NaN14}}... and so on.

here number represents contours at different Z-height

now, I want to arrange all these contour such that I have 3 different matrix consist of

A1={{1},{3},{5},{7},{10},{13}} and so on

A2={{2},{4},{6},{8},{11},{14}} and so on

and

A3={{9},{12},{15}} and so on until the last contour

when we look from the top A1 = concave feature, A2 = convex feature and A3 = concave feature