AFREF:African Geodetic reference frame updates in 2010

Many countries on reference system

AFREF ; African geodetic reference frame is an initiative from African researchers and promoters of the use of GNSS to have a standard, common reference frame for Africa based from different projections used in each of more than 50 countries to one unified as it has been done in Europe with EUREF and other parts of the world
Rationale for AFREF in various applications

Cape Town at AFREF launching in 2006

Mapping
Surveying
Security
Science
Disaster mitigation
Climate change monitoring
infrastructure palnning

How it works
Transformations between local reference frame like clarke , UTM to WGS ITRF using transformation parameters , use GNSS stations on ground to evaluate the real data in each region .
Chronologies
Capetown March 2000
Need expressed in GSDI meeting
Tunisia may 2000
Northern countries meeting
Capetown march 2001
8 countries attended proposed to go under IAG
Lusaka july 2002
Several counries attend proposal to have a reference frame based on ITRF
Windhoek December 2002
8 southern and east african countries attended and prepared a Windhoek declaration
AddisAbbaba august 2004
Working groups set up
Capetown july 2006
Technical workshop
NAirobi August 2007
Technical workshop for most the east african countries
Nigeria september 2007
AFREF stakeholsders Forum
Rectas established 1st permanent GNSS
Abuja March2010
Technical workshop on AFREF
Nairobi September 2010
AFREF and GNSS course
Interdisciplinary meeting
Washington June 2010
Ile Ife february 2010

Number of activities underway to install permanent base stations
Data from 45 continous stations are available on http://www.afrefdata.org/ or on ftp at ftp://ftp.afrefdata.org/
Realization of AFREF objective of determining transformation parameters a study dne by FI OKEKE of The University of Nigeria

Algeria Angola Benin Botswana Cameroon Egypt Ethiopia Ghana Kenya Lesotho
Malawi Morocco Mozambique Namibia Nigeria Rwanda South Africa Swaziland

Tanzania Tunisia Uganda Zambia

References
http://osgof.gov.ng/admin/uploads/transformation_parameters_afref_okeke(1).pdf
http://iag.ign.fr/abstract/pdf/Wonnacott_REFAG2010.pdf
http://www.space.gov.za/conferences/alc2007/programme/Wonnacott.pdf
http://osgof.gov.ng/admin/uploads/nignet%20project%20benefits%20new(1).pdf
geoinfo.uneca.org/afref