Descent Threshold True Airspeed 
AV Web
MAY 6, 2025
If the airport is your home drome, and there is a big oak tree or a Walmart on final you can measure the distance from there to the threshold on a sunny day. Then as you fly over your designated landmark and see the threshold, you will know that you have the measured distance. Approach lighting systems are a known, published length.
Pilot Institute
MAY 4, 2024
Your aircraft will fly at a faster true airspeed at higher density altitudes. Any substantial changes to speed and descent rate will destabilize the landing. If it prevents you from landing close to the threshold, a short runway becomes even shorter. Power controls the rate of descent, and pitch controls airspeed.
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