Julian O - 2019-10-04

Hi Everyone,
I am coooompletely new here, please applogize if I say something... dumb.
I have a mesh, so far in XYZ but what I would like is to upsample it, or make it denser.... the grid comes from the airborne survey and represent a terrain. Everywhere where I asked for such option I was told it is not possible without interpolation.. I kind of agree but anyhow seeking other ways, especially after googling the following

https://sourceforge.net/p/meshlab/discussion/499533/thread/15417ea5/

Any tips more than welcome,

P.S. Attached MESH
Thank you
J