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How could someone interpolate spatial data on a curvilinear grid, like the one in the picture shown?

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    $\begingroup$ What do you know about interpolating onto any grid? Have you tried anything? $\endgroup$ – tpg2114 Mar 11 at 11:05
  • $\begingroup$ Do you know a set of appropriate orthogonal functions for the task? $\endgroup$ – Whit3rd Mar 11 at 11:19
  • $\begingroup$ @tpg2114 I know about bi-linear and tri-linear interpolation onto a regular Cartesian mesh grid. I also understand how spline interpolation works. However ,based on bi-linear interpolation, I cannot understand how I would find the value of a function f at the point f(r0,theta0) knowing the values of f at every node on the grid. Would I just use weights for nearest neighbors? $\endgroup$ – Kostis Papadakis Mar 12 at 16:58

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