Reference datum height

In aviation, reference datum height (RDH) is the height of a point, located above the intersection of the runway centre line and the threshold, through which the downward extended straight portion of the glide path passes.^[1] It is usually found on the aerodrome instrument approach charts.

See also

• Vertical datum
• ICAO recommendations on use of the International System of Units

References

1. Instrument Landing System Reference Datum Height Eurocontrol.int