iso surface extends above topo

[craigmillernz]

When I create an isosurface using the Create Iso Surfaces geoapps notebook, the surface is extrapolated above topography

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Is this related to the Max Interpolation distance? For this example I used 1000m Max Interpolation Distance.
Can the interpolation be limited to not go above the topo (i.e. into inactive cells)?
Alternatively if the topo was available as a slicing surface I could just chop it off.

[github-actions]

JIRA issue [GEOPY-424] was created.

[RichardScottOZ]

Which notebook Craig? Looks pretty cool.

[craigmillernz]

Thanks, this is the Create Iso Surfaces notebook in geoapps.

[craigmillernz]

Update that this issue occurs when the cells above topo have been set to a "no data value" i.e. cells are blank in the Analyst cell table. If those cells are filled with a numerical value i.e -99999 then the isosurface forms correctly.