Adjustment of the classical terrestrial geodetic network of Mazambique : tied to ITRF
Santos, Paula Cristina Cunha, J. Nuno Lima & J.L. Quembo
In Mozambique a triangulation network with 750 geodetic points and a linear extension of about 9000Km, covering the whole country, was implemented between 1907 and 1973 by portuguese scientific and technical missions. At the beginning the precision corresponded to a 2nd order European triangulation. After 1957, the precision was upgrade to the 1st order. After several decades this geodetic patrimony is still important for the economic, technologic and scientific development of Mozambique since it is used as the basis for the cartography produced until now. In 1991, Portugal and Mozambique established a Protocol for the revision and adjustment of the Mozambique geodetic network. Mozambique has also a GPS network with 245 stations installed in cooperation with the Special Team Royal Engineers (UK) and the Joint Venture Norway Mapping of Mozambique. Thirty of these stations are common to the classic network. The classic network was adjusted to the global datum WGS84/ITRF94, fixing the coordinates of those thirty points. The mean value of the error ellipses semi-axis was reduced from 2.5m to 0.5m.
Event: 5th FIG Regional Conference for Africa : Promoting Land Administration and Good Governance
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