"In the year 25 25..." I think that the scheme you are looking at has more to do with a mindset of image resolution. For example, if my final render in Bryce is going to be 1024 wide, I'll use a jpg mat that's 1024 wide. Once I'm in that mindset, the units which use that scheme are easy to think about. As opposed to translating to a different scheme. Imagine measureing a house in square feet and the wall height in meters. Takes too much brain power to translate. Does this make sense?