The answer would depend upon the local zoning, local fire code, state fire code, type of construction, type of occupancy, type of hazard, among other things.
PTR
Distance.
Spatial distance is the separation between various objects.
"Separation," in terms of aircraft, is the minimum distance, both laterally and vertically, permitted in order to be considered "safe." In other words, "separation" is the distance between aircraft in all directions. If a flight is maneuvered for "separation," it is simply being turned in a direction that puts more distance between it and other aircraft.
what is the required distance beteen emergaency exit dorrs for industrial buildings
decreases
The electrostatic force between two charged objects is inversely proportional to the distance of separation between the two objects. An Increase in the separation distance between objects decreases the force of attraction or repulsion between the objects.
VLAN
The amount of separation between two horizontal surface/Plane
Distance is measured using reference points therefore distance, between objects, is relative. Some of the units used can be absolute, the separation between two or more points cannot.
1 Meter
The difference in the y coordinates would be your vertical separation.