Sec.  1.959   Computation of average terrain elevation.

   Except as otherwise specified in  Sec. 90.309(a)(4) of this chapter, average
   terrain elevation must be calculated by computer using elevations from a 30
   second point or better topographic data file. The file must be identified.
   If a 30 second point data file is used, the elevation data must be processed
   for intermediate points using interpolation techniques; otherwise, the
   nearest point may be used. In cases of dispute, average terrain elevation
   determinations  can  also  be  done  manually,  if  the results differ
   significantly from the computer derived averages.

   (a) Radial average terrain elevation is calculated as the average of the
   elevation along a straight line path from 3 to 16 kilometers (2 and 10
   miles) extending radially from the antenna site. If a portion of the radial
   path extends over foreign territory or water, such portion must not be
   included in the computation of average elevation unless the radial path
   again passes over United States land between 16 and 134 kilometers (10 and
   83 miles) away from the station. At least 50 evenly spaced data points for
   each radial should be used in the computation.

   (b) Average terrain elevation is the average of the eight radial average
   terrain elevations (for the eight cardinal radials).

   (c)  For  locations  in Dade and Broward Counties, Florida, the method
   prescribed above may be used or average terrain elevation may be assumed to
   be 3 meters (10 feet).

   [ 70 FR 19306 , Apr. 13, 2005]

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