interpolate vectors represented as (X & Y) per point on a Grid represented as (X&Y)

Is there a way to interpolate a surface without separating the vector into X & Y?

Let say I have a surface and I want to plot topography over that surface.

I could;

x_Vector2=TriScatteredInterp(Xgrid,Ygrid,xVector)

y_Vector2=TriScatteredInterp(Xgrid,Ygrid,yVector)

problem is that I have one interpolate per direction.

[Nabeel Abbood]

This is what I am doing for now and still looking for a better way if there is.