choosing between Multivariate, Univariate and Spline interpolation

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I have dataset of points with coordinates and temperature measured at each point. I would like to interpolate the points to generate a continuous image.
I have checked Scipy and I have seen that there are different types of interpolation methods on scipy.

what is the difference between Multivariate interpolation, Univariate interpolation and splines?When should I choose each one?