It may be possible to recognise more substantial buildings (taller structures, or two-storey builds) from two factors:
On the ground there are notably larger mounds: is it possible to conjecture the scale of building from the scale of debris? The assumption is that more substantial structures, with thicker load-bearing walls to support upper floors or larger vaulted spaces, and with a greater volume of building material, will generate larger quantities of debris during their collapse and erosion, thus creating more substantive mounds, relative to surrounding structures.
These higher mounds often produce a distinctive visual signature on aerial/satellite images: because the mounds are higher than the surrounding surface they tend to catch the light and often appear slightly lighter than surrounding mounds.
Taken together, it is possible to argue that more substantial building ranges may sometimes be identified on the APs.