PE&RS May 2017 Full - page 340

340 May 2017 PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING
Update
“The 1 st order Moçambique geodetic network still presents
zones with low precision, such as the north coast. The
conjunction of GPS and terrestrial observations of well
distributed pointswithin the territorywould by a good solution
to improve the equality of this network. The prediction of re-
observation of more than 30 well distributed points within
the whole territory using GPS, in order to obtain a valid
group of vectors is included in the Portugal and Moçambique
cooperation protocol. This will make the conversion to ITRF94
datum more consistent and will allow the integration of all
networks in the same system” (Adjustment of the Classical
Terrestrial Geodetic Network of Moçambique Tied to ITRF,
Santos, P., et al., Workshop – AFREF I, 5th FIG Regional
Conference, Accra, Ghana, March 8-11, 2006.)
“The adoption of MozNet is a decisive step for the
modernization of the geo-referencing activities in
Moçambique. Moçambique has now a network of permanent
GPS stations that permit the definition and realization of a
geocentric datum This network still needs to be densified. The
difference between MozNet/ITRF94 and MozNet/ITRF2008
is around 2 cm between the extreme north and south of the
country which is negligible for practical purposes. Since the
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differences between MozNet/ITRF94 and MozNet/ITRF2008
are small, it was decided to adapt MozNet/ITRF94 as the new
official reference system realized by the permanent network
(MozPerm) and the already observed points” (Validation
and Implementation of MozNet – the geocentric reference
frame of Moçambique, Fernanedes, R.M.S., et al., MozNet –
Luxembourg, 13-17 October 2014.)
Dr. Fernandes informs me that two years ago an aerial
gravimetric survey was completed of the entire country in
support of a national geoid. (Personal communication, 28
March 2017.)
The contents of this column reflect the views of the author, who is
responsible for the facts and accuracy of the data presented herein.
The contents do not necessarily reflect the official views or policies of
the American Society for Photogrammetry and Remote Sensing and/
or the Louisiana State University Center for GeoInformatics (C4 G).
This column was previously published in PE&RS.