Article Index

1. Forward Computation

A Forward Computation is used to calculate a point's coordinates from distance and direction data from another set of coordinates:

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Figure C-1
Forward Computation
Equation C-1

 

Eqn (C-1) is a combination of the latitude and departure and coordinate equations from the Traverse Computations topic.

  • North Lat is (+), South Lat is (–)
  • East Dep is (+), West Dep is (–)

DirAB can be either a bearing or azimuth:

  • If a bearing (0° to 90°) is used you must manually determine the correct algebraic sign for the Lat and Dep based on quadrant.
  • Using azimuths (0° to 360°) automatically results in correct signs.

Because point B has two unknowns (NB and EB) it must be connected to point A with two measurments,  distance and direction. Having only one or the other isn't sufficient to determine B's coordinates.

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