Notes

Slide Show

Outline

1	OPUS in MEXICO
2	New concepts about reference frames
3	Rigorous Definition of a Terrestrial Reference Frame
4	How are different reference frames connected?
5	Extra information required for a Datum
6	Three realizations of the NAD 83 datum
7	The Mexican Datum Through History
8	OPUS: On-line Positioning User Service
9	OPUS covers now the North American continent
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13	Mexican Geoids
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