Goto Section: 24.52 | 24.55 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 24.53 Calculation of height above average terrain (HAAT).
(a) HAAT is determined by subtracting average terrain elevation from
antenna height above mean sea level.
(b) Average terrain elevation shall be calculated using elevation data
from a 30 arc second or better Digital Elevation Models (DEMs). DEM
data is available from United States Geological Survey (USGS). The data
file shall be identified. If 30 arc second data is used, the elevation
data must be processed for intermediate points using interpolation
techniques; otherwise, the nearest point may be used. If DEM data is
not available, elevation data from the Defense Mapping Agency's Digital
Chart of the World (DCW) may be used.
(c) Radial average terrain elevation is calculated as the average of
the elevation along a straight line path from 3 to 16 kilometers
extending radially from the antenna site. At least 50 evenly spaced
data points for each radial shall be used in the computation.
(d) Average terrain elevation is the average of the eight radial
average terrain elevations (for the eight cardinal radials).
(e) The position location of the antenna site shall be determined to an
accuracy of no less than Â±5 meters in both the horizontal (latitude and
longitude) and vertical (ground elevation) dimensions with respect to
the National Geodetic Reference System.
[ 58 FR 59183 , Nov. 8, 1993; 59 FR 15269 , Mar. 31, 1994]
Goto Section: 24.52 | 24.55
Goto Year: 2020 |
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