YetAnotherCoupler 3.1.1
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Hybrid cubic spherical Bernstein-Bézier patch interpolation

Table of Contents


The Hybrid cubic spherical Bernstein-Bézier (short: HCSBB) patch interpolation method is based on Alfeld, P. et al. (1996). It is implemented for source fields defined on grid cell or corner points.

The interpolation method first triangulates the source grid. Then the derivatives of the source field across the edges of the triangles are estimated. Using these, triangular patches from a blend of spherical Bernstein-Bézier polynomials are constructed which are used for the interpolation of the target points.

The resulting target field will always have a contiguous first derivative.

The Patch recovery interpolation method (Zienkiewicz, O. et al. (1992)), which was in included in YAC1 and is implemented in the Earth System Modeling Framework does not guarantee the above mentioned property, which is why we implemented HCSBB in YAC2 as a replacement.

This interpolation method is computationally expensive and produces a quite big interpolation stencil.

Source field
Target field


HCSBB currently has no option that can be configured by the user.

YAML example

- bernstein_bezier