§ 1.959   Computation of average terrain elevation.

   Except as otherwise specified in § 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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