Hi! There are multiple packages than can do multivariate interpolations. You can have a look at the following thread: 3D interpolation in Julia. To name some you might want to look at: Dierckx.jl, GridInterpolations.jl, GMT.jl, DIVAnd.jl, RadialBasisFunctions.jl, ScatteredInterpolation.jl, KernelInterpolation.jl. Which of these is suited the best for your use case depends on how your data looks like, especially the location of your data points in \mathbb{R}^2 (e.g., grid data or scattered data). If you have any questions about one (or multiple) of these packages, feel free to ask.
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