Final answer:
Cat I ILS DH refers to Category I Instrument Landing System Decision Height in aviation, while RVR stands for Runway Visual Range. Cat I ILS DH is the minimum height at which pilots should be able to see the runway, and RVR is a measure of the horizontal distance at which the runway can be seen.
Step-by-step explanation:
Runway Visual Range is known as RVR in aviation, and Category I Instrument Landing System Decision Height is referred to as Cat I ILS DH.
The minimum height during instrument landing approaches at which the pilot should be able to see the runway is known as Category I ILS DH. Usually, it is positioned 200 feet above the floor. The horizontal distance at which the pilot can see the runway is measured by RVR, on the other hand.
For instance, if the RVR is 1200 feet, the pilot must be able to see at least 1200 feet down the runway in order to make the landing.