The Difference Between Wgs84 And Gda94

Guideline for Control Surveys by GNSS Special Publication 1

By 2010, for example, the horizontal difference between GDA94 and WGS84 (as used for the GPS Broadcast Ephemerides) had exceeded one metre. In the case of Precise Ephemerides, IGS uses the most modern ITRF realisation and the current week for the reference epoch. This can also introduce significant differences compared to GDA94.

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