Attached Link: http://forum.daz3d.com/viewtopic.php?t=125244&highlight=bryce+unit

I could be wrong, but I really thought I read somewhere what a Bryce unit is supposed to be equal to, although as we all know, scale is relative in Bryce...to a certain extent.  I've seen people respond with "it's whatever you want it to be.

Ok.  I'll let the default terrain be a thousand feet high, and therefore a cube, and a Bryce unit will be a thousand feet high.  Good luck with getting any good results with atmosphere, haze, etc.  How about if I make a Bryce unit equal one foot?  That's better but how accurate is the view from a 30 degree Bryce camera with that scale?

Granted, all these things are scalable, but there must be some very, very general guideline for scale, not that I'm going to adhere to that religiously.  Even Poser has it's Poser units which are equal to a certain amount.  Oddly enough, that means that most of the Poser figures are very tall in their default state.

Then again, and I really mean this, I could have dreamed that I read about what a Bryce unit equals!  But I'm still going to keep looking.  Someone got the figure of 8 feet here: