Interesting question! I just had an appraisal come back badly because the appraiser didn't know the difference between a bi-level (or as you call it a 'hi-ranch', I had never heard it called that before), and a raised ranch. The home in question is a lake front home. A great many lake fronts here are raised ranches to take advantage of the view. The appraiser only counted the upper floor, where the living room, dining room, etc, were located, as square footage, essentially reducing it by half. In fact, at least here in New Jersey, both floors of a raised ranch should be counted as square footage because there is no 'basement' only the first level, which, in this case, consisted of family room, den, laundry room, 4th bedroom and a half bath.
This much I know a raised ranch has the main living area on the second floor, typically consisting of living room, dining room, kitchen, master bedroom, and smaller bedrooms; and additional living space, family room, office, etc, on the first floor. They are often seen at the water's edge, or in extremely rocky areas where digging a basement is not practical. Bi-levels, on the other hand, have two half staircases at the entrance, one that goes up to the living area, and one that goes down to the 'basement' area.