For instance, I'm in a room that has a "popcorn" textured ceiling. Suppose I take detailed pictures of it, and start making maps, giving names to the numerous bumps. Would that really be knowledge? There is no doubt that it would be data.
Now there can be other relevant limitations, like physical constraints such as how much data storage is available, or social concerns like not divulging the physical address when some threats and hurts are very plausible consequences.