3d Interpolation with irregular input grid

[blueade7]

Hi,

I have a 3-dimension dataset on a grid which has regular monotonic x and y coordinates, but an irregular, non-monotonic z coordinate.

In other words this z coordinate varies with every data point, so is necessarily 3-dimensional itself.

I would like to take a horizontal slice through this data, i.e. to interpolate it onto a single z level.

Does anyone know of a way to do this in python? I've tried interpolate.griddata but I don't think that can handle a 3-d input coordinate.

Thanks