Height Above Average Terrain

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What Does Height Above Average Terrain Mean?

Height above average terrain (HAAT) measures how high a transmitting point is above the surrounding topography. This can be important in broadcasting activities, and in relation to data or voice transmission systems, or conventional radio and television.

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Techopedia Explains Height Above Average Terrain

Measuring HAAT involves specific methods to look at the alteration of height on a piece of landscape. The Federal Communications Commission maintains a HAAT calculator online that can be used to determine height above average terrain. These measurements may be useful, not only for large-scale broadcasting, but for operating extenders such as small cell extension towers or Wi-Fi extensions. For example, a HAAT requirement might be attached to a piece of gear used to transmit a signal.

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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.