- CDC (International Association of Geodesy / Committee for Developing
Scientific Assembly - Budapest, September 2 - 8, 2001.
the General Assembly in Vienna, August 1991, the IUGG (International
Union of Geodesy and Geophysics) requested to each of its constituent
associations to reinforce actions towards Developing Countries. For
this reason the IAG Executive Committee, at its meeting in Columbus,
March 1992, set up an IAG Committee for Developing Countries (IAG -
CDC). The committee had several activities on the coordination of
Michael Louis. With his retirement the activities have been
discontinued. At the EC meeting in Como, November 1999, a proposal by
the president has been approved to restart the activities of IAG - CDC
under the coordination of Denizar Blitzkow.
To encourage and to facilitate present participation of developing
countries in geodetic activities with a significant contribution to
their own development as well as to the development of geodesy in
To request all IAG bodies and organizations to take into account, in
their activities, the needs and capabilities of developing countries
in order to ensure a profitable participation of them.
IAG - CDC Membership
Blitzkow (Brazil) - Chairman
Edvaldo Simões da
Fonseca Junior (Brazil)
Merry (South Africa)
Salem Kahlouche (Algeria)
Napoleon Hernandez (Venezuela)
- CDC has been involved directly or indirectly with different projects
in South America and Africa.
Gravity surveys for densification of national network have been
carried out in several countries for the last few years. The following
countries have improved the gravity coverage due to this action:
Argentina, Brazil, Chile, and Paraguay.
initiative has been coordinated by D. Blitzkow and supported by
NIMA(USA), GETECH (University of Leeds UK), and many national
organizations in the different countries. As a consequence, several
improved versions of the geoid have been derived for the continent in
a joint cooperation of EPUSP and IGeS.
Workshop: South America Geoid 2000;
South America Geoid 2000 workshop held at Escola Politécnica,
Universidade de São Paulo, May 17 - 19, 2000, was organized by IGeS
(International Geoid Service), SCGGSA (Sub-Commission for Gravity and
Geoid in South America), CDC (Committee for Developing Countries) and
it was also supported by IAPSO (International Association of the
Physical Science of the Ocean). The workshop had the following
To assemble as many countries as possible from South America to
compute a geoid model.
To encourage every country to cooperate with SCGGSA for data
To encourage every country to compute a local geoid model with
the data available.
To discuss different efforts for data acquisition in the
countries that participated to the activities were the following:
Argentina, Brazil, Chile, Ecuador, Paraguay and Uruguay.
- CDC Participation: D. Blitzkow, R. Barzaghi, O. Andersen, R.
African Reference System (AFREF): Southern Africa
of 8 countries in Southern Africa met in Cape Town on the 13th and
14th of March 2001 to discuss a regional project within the broader
AFREF project to create a uniform geodetic reference system for
Africa. The 8 countries present were: Botswana, Malawi, Mozambique,
Namibia, South Africa, Swaziland, Zambia and Zimbabwe.
- CDC Participation: Sansò, F., Neilan, R..
Organization of Africa gravity data for geoid computation
purpose of this project is to carry out a determination of the geoid
in Africa. A major part of the project will be to collate and merge
gravity anomaly data sets for Africa. Because of the paucity of these
data and their poor distribution, the geoid that will result wont
be very precise, but it should still be a substantial improvement over
the global EGM96 model. An equally important part of the project will
be to develop geoid computation expertise within Africa.
do the African Geoid was created a working group with the following
Identifying and acquiring data sets - gravity anomalies,
Training African geodesists in geoid computation;
Merging and validation of gravity data sets, producing 5
gridded and mean Dg;
Computation of African geoid, and evaluation using GPS/leveling
- CDC Coordination: C. Merry, D. Blitzkow.
2nd Workshop on the definition of the North African Reference Frame (2°
Atelier Nord Africain de Géodésie)
of the following countries participated to the workshop: Algeria,
Libya, Morocco, Mauritania and Tunisia.
the workshop a project was created to unify the Geodetic Reference
Frame in North Africa (NAFREF).
do the unification 3 working groups were created:
I: Definition and establishment of a Terrestrial Reference System for
II: Unified Geoid Determination.
III: Establishment of a General Committee for the realization of
NAFREF. It was created two committees: Coordination Committee and
- CDC Participation: F. Sansò, Z. Altamimi, M. Sarrailh, S. M. Alves
prepared by D. Blitzkow and E.S. Fonseca Junior)