GEOID SERVICE REPORT (1999 2001)
the IAG/IUGG General Assembly held in Birmingham, IGeS has developed
several activities, both on the international and the Italian side.
of the main tasks of IGeS was to promote and to organize schools on
geoid determination, focussed on theoretical and practical aspects.
February 2000, a geoid school was held in Johor Bahru (Malaysia) in
cooperation with the Department of Survey and Mapping Malaysia (DSMM),
acting as local organiser.
was the fourth international school organised by IGeS in the last six
years. The general purpose of this school was to prepare new graduate
students, young scientists or employees of national agencies and
services or industry staff, to use and, when necessary, to compute
gravimetric geoids for the many scientific and technical applications.
topics discussed during the five lectures were: a general introduction
to physical geodesy with special emphasis on geoid computation and
collocation theory; the computation and use of high degree and
ultra-high degree geopotential models; the geoid computation using
Stokes integral; terrain effetcs in geoid estimation; FFT
techniques in geodesy.
students coming from Australia, Chile, China, Ethiopia, France, Hong
Kong, Indonesia, Malaysia, Nepal, Singapore, Sweden, Republic of
Maldives and USA attended the school. Lecture Notes and IGeS software
have been provided as well as numerical exercises which have been made
available to the students.
further geoid school was planned on January 2001 in Cairo, Egypt.
However, due to organisational problems, this school wasnt held and
was rescheduled for February 2002. A geoid school in the Unites States
is also planned on December 2001 in San Francisco.
IGeS was actively involved in a relevant project for geoid
determination in South America.
project was carried out in strict cooperation with NIMA and the Escola
Politécnica, Universitade de São Paulo and led to two new estimates
of the quasi-geoid over an area covering the whole South America.
These results were presented during the South America Geoid 2000
Workshop held at the Escola Politécnica, Universidade de São Paulo,
from May 17 to 19, 2000. This meeting 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 aimed at encouraging
cooperation in data delivery among South American nations in the
framework of the SCGGSA activities and also at promoting national and
regional geoid estimates in South America. Furthermore, cooperation
between oceanographers and geodesists for the computation of the geoid
in coastal areas was encouraged.
participants attended the workshop and the South America nations
involved were Argentina, Brazil, Chile, Ecuador, Paraguay and Uruguay.
The new quasi-geoid solutions were also presented at the IAG Symposium
on Vertical Reference Systems (VeReS), Cartagena, (February 2001) and
during the last EGS Assembly in Nice (March, 2001).
projects will involve IGeS in geoid estimation activities in
Antarctica and in South Africa: a preliminary data analysis on gravity
data in an area of Antarctica has been presented at the Nice EGS
Assembly in the G7 Session on Regional and local gravity field
web has been also updated during these two years and contains at
present 23 geoid data files and a collection of 11 global geopotential
models. In the near future, software on terrain correction and GIS for
geoid update will be made freely available through the IGeS web.
important activity which started in 1993, namely the publication of
the IGeS Bulletin, was continued and improved. The Bulletin number 10
was published on May 2000 and the next issue is going to be published
within May 2001: starting from the tenth issue, the Bulletin became a
reviewed scientific journal. The next important change will start with
the future issues that will be published almost entirely on CD .
also actively participated, together with BGI, NIMA, ICET and GFZ, in
the creation of a new IAG service named International Gravity Field
Service (IGFS). IGFS has been proposed as a unified structure aiming
at collecting, validating and distributing data and software for the
purpose of determining, with various degrees of accuracy and
resolution, the gravity potential of the Earth, or any of its
functional, and the surface of the Earth.
Italy, IGeS worked at estimating and refining the Italian geoid and is
cooperating with the Italian Space Agency (ASI), the Istituto
Geografico Militare (IGM) and the Agenzia del Territorio (Italian
in this context, IGeS has organised schools on theory and practice for
geoid computation. They were held at the IGeS Main Centre (DIIAR,
Politecnico di Milano) on February 2000, at IGM in Florence on October
2000 and in Rome at the Agenzia del Territorio on January 2001.