How to fill the gaps in a patch plot through adaptive interpolation

I have a 2 dimensional patch plot that looks like this where the colors represent magnitude of flow rate so basically I have x position, y position and magnitude of flow rate for each of the patches you see.

Is there any way I can fill in the entire area (within the red lines in the below image )through some sort of adaptive interpolation of particular connectivity so it does not fill up the entire image?

Thanks in advance!!!

[KSSV]

Try Griddata, scatteredinterpolant.

[J. Alex Lee]

but i'm not sure that the red curves correspond to any kind of human-interpolation scheme my eye could apply on the data points...what "rule" in english do you imagine to define the positions making up the red curve??

[AAS]

The red curves dont matter as much.. its just somethign I drew to show how I want the patches filled.

[J. Alex Lee]

AAS, it seems to me your question is about how to define the location of the red curves...in what sense do they not matter as much?

[AAS]

Hi Alex,

I basically want to do some sort of adaptive interpolation for each point you see. The color of the point defines the magnitude. So I want to do some sort of interpolation through connectivity. For example, for each point, create 8 more points around it with same magnitude. I tried griddata and scatteredinterpolant @KSSV but the white space gets filled due to some errors with the convex hull. Do you have any other recommendations?

[J. Alex Lee]

so you are not asking to fill in the space between the red curves with a single color, but you want the region between the red curves to be a patchwork of color, informed by the small patches you already have in there?

[AAS]

Yes exactly

Answer 1

[J. Alex Lee]

You could add in "corners" where your red curves intersect the y-axes as new (x,y) coordinates, then do a convexhull on them. That should create a "tight" blanket around your points.

If you can then identify those points along the top edge vs bottom edge (in this case maybe above and below mean y-value?) you can shift or stretch the appropriate y-coordinates up and down appropriately.

Could it work?

[J. Alex Lee]

edit: this answer is for drawing a single colored band indicated by something like the red curves in the question, it does not answer the actual question.

[AAS]

No I am sorry that’s not what I am looking for but thanks for the suggestion.

Answer 2

[J. Alex Lee]

If you reduce your current patches into single (x,y) coordinates, e.g., center of mass, then you can triangulate/find the voronoi diagram of them

https://www.mathworks.com/help/matlab/ref/delaunaytriangulation.html

And hopefully be able to use that as a basis to create the patches you are looking for