Introduction.

This document describes and re-derives the equations of the Gauss-Conform projection system. It takes the form a extended worked example intended to be easy to follow. The initial few chapters contain some information useful to the non-mathematical.

A C++ program is available to perform the transformation. As this work was written and developed using free software, the C++ source code and the latex source document is available free. If you would like to recieve a copy of the C++ source code or the latex source please write to ece@dwaf.gov.za.

• Why?
• What is the Gauss conform system?
• Which latitude?
• Some definitions and notation.
• Sign and axes convention.
• The constants of the spheroid.
• The constraints.
• More definitions, conventions and a cartesian coordinate system.
• Converting from Geodetic to Geocentric latitude.