Dear @AndersMS

Thanks for your detailed replies. I think there are only two outstanding points 
in those you have answered.

**18**: Now I understand what you mean, thanks. To make this clearer to myself, 
I would say something like this: Bounds interpolation uses the same tie point 
index variables and therefore the same tie point cells as coordinate 
interpolation. One of the vertices of each coordinate tie point cell as chosen 
as the bounds tie point for the cell. For 1D bounds, the vertex chosen is the 
one which is on the side closer to the boundary of the interpolation subarea. 
For 2D bounds, the vertex chosen is the one which is closest to the boundary of 
the interpolation subarea, considering all the interpolated coordinates 
together, or in other words, the one closest to the corner of the interpolation 
subarea.

Are you restricting the consideration of 2D bounds to rectangular cells, or are 
polygons of _n_ vertices allowed?

**27**: I think the key point is that you mean _three-dimensional_ Cartesian 
interpolation. I didn't think of that. If you could clarify this, it would be 
fine.

Cheers

Jonathan


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