does `gen_topo` average altitude irrespective of sign?

[aekiss]

Hi @micaeljtoliveira do you recall whether gen_topo averages altitude irrespective of sign? Or does it just average the points that are underwater?

[micaeljtoliveira]

@aekiss I'm not sure. I couldn't see anywhere the sign being taken into account, but this part of the code is quite convoluted, so I might just have missed it.