Document ID: chunk:federal_register_of_legislation:F2020L01460:reg:10:p4
Version: federal_register_of_legislation:F2020L01460
Segment Type: reg
Provision Reference: reg 10 (pt 4/4)
Character Range: 23860–25044

corresponding DEM-3S cell, for the purposes Step 2 in item 1, is the adjacent DEM-3S cell with the minimum height.
Note: Additional information for the case where (lmn, Lmn) corresponds to a DEM-3S cell boundary is provided in the document titled 'Digital Elevation Model Interpretation', available for free on the ACMA website: www.acma.gov.au.

Part 3  Vincenty's Direct Formulae
Note: This implementation of Vincenty's Direct Formulae uses the parameters from the GRS80 ellipsoid as referenced by GDA94.
   1. In calculating (lmn, Lmn):

lt     is the latitude of the fixed transmitter (decimal radians)

Lt     is the longitude of the fixed transmitter (decimal radians)

α      is the azimuth angle (decimal radians)

d      is the separation distance to required point (m×100 metres)

a      is the semi-major axis with value 6378137 metres

fl     is the flattening of the value 1/298.25722210

b      is the semi-minor axis of (a×(1-fl))

   2. Using an initial value , iterate the following three equations until the change in  is less than 10-12.

   3. Then:

Note: Use the four-quadrant inverse tangent, atan2.

Note: Use the four-quadrant inverse tangent, atan2.