XYZ geographic data interpolation, part 3

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This will be probably be a final posting on interpolation of xyz data as I believe I have come to some conclusions to my original issues. I show three methods of xyz interpolation:
1. The quick and dirty method of interpolating projected xyz points (bi-linear)
2. Interpolation using Cartesian coordinates (bi-linear)
3. Interpolation using spherical coordinates and geographic distances (thin plate spline)
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