4. Reduction Summary

If it seems like there are a lot of computations involved, well, there can be. Measurements are distorted going from ground to grid and these computations are used minimize their impact.

Depending on the project scope or accuracy needs, some generalizations can be made to reduce computations. For example, it may be possible to use a single Combined Factor for distance reductions or arc-to-chord corrections may be small enough to ignore. On the other hand, a control quality survey may require each line and direction be individually reduced.

Computations can also flow in the other direction: grid to ground. These are largely a reversal of the of the procedures described in this chapter and might be generalized based on project needs.