Location Accuracy

The Where application location accuracy depends on the distance of the beacon signals from the tags to the sensors mounted on the ceiling or anchored to a fixture. Several critical factors such as the floor height, floor elevation, sensor height offset from the ceiling, and type of fixture installation determine the accurate location of objects or people on a floor.  All these have to be configured in Manage for the Where application to locate objects or people precisely on the floor. Note that these fields are only used by the Where application and are optional for other applications. Before entering the following information in Manage, verify the existing elevations on a site with the available civil drawings.

Ceiling Height – This is the ceiling height, above the finished floor, of each floor in the building. Typical ceiling heights in commercial office buildings is 10-12 feet. If the ceiling height is not specified, the Where application uses a default height of 12 feet. Valid values range from 0 to 100 feet and values must be entered in feet (e.g. 12’ 3” = 12.25).

Floor Elevation – This is the vertical distance above or below the Ground Floor. In North America, the first floor is considered the Ground Floor and would have a Floor Elevation of 0. The second-floor elevation could be 20 feet above the Ground Floor, the third floor at 40 feet above Ground Floor, and the basement could be negative 20 (-20) feet below the Ground Floor. Valid values range from -1000 to 10,000 feet and values must be entered in feet (e.g. 75’ 6” = 75.5).

Ceiling Height Offset – The difference between the ceiling height and the height of the sensor, relative to the finished floor. For example, a pendant fixture hanging 3 feet below the ceiling would have a Sensor Height Offset of negative 3 (-3). If no value is entered the offset is assumed to be zero feet. A lobby entrance with a 5-foot taller ceiling than the waiting area would have a Sensor Height Offset value of positive 5 feet.

Note: The offset value must not be above or lower than the ceiling height.  For example, if the ceiling height is 12 feet, the height offset value from the ceiling cannot be greater than +12 or lower than -12 feet. Values must be entered in feet (e.g. 1’ 2” = 1.17).

Ceiling Height and Floor Elevation

Only the system or facility admin may update the ceiling height and floor elevation information for the building or add new floors. To edit the floor height and elevation for a building,

  1. Select a facility in the facility's navigation panel.
  2. Select a campus and building.
  3. Click the Settings tab.
  4. Scroll to the Details panel.
  5. Select a Floor Name from the list of floors and click the Edit button.
  6. Type a value for Ceiling Height in feet.
  7. Type a value for Floor Elevation in feet of the floor.
  8. Click Save.

Ceiling_Height_and_Floor_Elevation.png

Ceiling Height Offset

The sensor height offset can be set for individual sensors from the floor plan. In the Facilities left panel, click on the floor name. On the floor plan display, double-click a sensor to open the Fixture Details dialog box. Edit the Ceiling Height Offset value for the sensor and click the Apply button to save the setting.

Sensor_CeilingHT.png

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