Ok, that explains it.

And that's the reference system the Egyptian maps are drawn on - Helmert 1907.

No mention of how accurate the initial position at the centre of G1 is or how the calcualated it it on the Helmert grid. Presumeably they would have had to shot it in from local trig points, but there's no mention of this. Orientation to True North was done from Polaris timed to GMT.

Note: In 1984 there was no GPS available, so he had no choice but to use the local system.


Dave L



Edited 3 time(s). Last edit at 11/15/2006 10:07AM by Dave L.