Scope of AFREF
Activities
A sparse continuous
operating reference stations (CORS) GNSS network exists in Africa. This
network was established and managed by IGS and partners. Figure 1 shows
the current distribution in Africa.
Densification
of IGS networks with its products in Africa is the first step toward the
realization of AFREF. The densification requires that at least one GNSS
CORS is established in every African country. Such network of CORS shall
form the basis of and act as focal points for the establishment of national
GNSS networks. Where possible, more than one such station shall be established
in a country. The network so established shall form the AFREF core CORS
GNSS networks which shall be integrated with IGS global network.
The
densification of Core CORS GNSS network, largely on a country-by-country
basis, to determine the relationship between the national geodetic systems,
GNSS geodetic systems including GPS, GLONASS, & Galileo and the ITRF,
and to refine the transformation parameters necessary to relate the national
systems to ITRF shall follow. The densification will be carried out by
individual nationals by way of establishing national GPS networks through
either continuous or semi continuous permanent GNSS/GPS stations. However
on full realisation of AFREF, every country will have a CORS GNSS network
with capabilities to broadcast differential corrections and other useful
products to users.
Also
important are the development of a more refined geoid model for Africa
and the definition of a common vertical datum for the continent. This
shall also be done on country basis with regional and continental coordination.
For the project to be
realised,
African countries are expected to actively participate by establishing
onbservationcentres(tracking sites), data holding and analysis centres,
with the necessary equipments and personnel for smooth and sustainable
implementation and management.
