[Code of Federal Regulations]

[Title 47, Volume 2]

[Revised as of October 1, 2004]

From the U.S. Government Printing Office via GPO Access

[CITE: 47CFR24.53]



[Page 231]

 

                       TITLE 47--TELECOMMUNICATION

 

                    CHAPTER I--FEDERAL COMMUNICATIONS

                         COMMISSION (CONTINUED)

 

PART 24_PERSONAL COMMUNICATIONS SERVICES--Table of Contents

 

                      Subpart C_Technical Standards

 

Sec. 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 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]