Setting altitude type Possible to select between two altitude types (floors or meters). Meters are representing meters of altitude defined by the vertical datum specified. Floors are representing altitude in a form more relevant in buildings which have different floor-to-floor dimensions. An altitude = 0.0 is meaningful even outside a building, and represents ground level at the given latitude and longitude. Inside a building, 0.0 represents the floor level associated with ground level at the main entrance.