SMRF replacement?

[smathermather]

Call me grump, but I don't like SMRF. I think it's difficult to tune, still doesn't give great results, and could be upgraded / updated with better algorithms easily.

Any objection to testing the alternatives? And if we are doing so, what are our criteria?

https://pdal.io/en/latest/stages/filters.html#classification

I'm a huge fan of filters.pmf in my own work, mostly just set and forget. What have others experienced?

(parallel post here: https://community.opendronemap.org/t/smrf-replacement-for-point-cloud-filtering-in-odm/21993)