UNION GEODESIQUE ET GEOPHYSIQUE INTERNATIONALE INTERNATIONAL UNION OF GEODESY AND GEOPHYSICS Prepared by Hussein Abd-Elmotaal 1 Detailed Geoid Model for Africa Final Report Hussein A. Abd-Elmotaal Minia University, Faculty of Engineering Civil Engineering Department Egypt abdelmotaal@lycos.com 1. Over View This report summaries the main activities and achievements of the IUGG grant entitled "Detailed Geoid Model for Africa". The grant ran in the period 2012–2014. The lead applicant is IAG, represented by the IAG Secretary General, Hermann Drewes, DGFI, Munich, Germany. The Project Principal Participant of the IAG lead applicant is Hussein Abd-Elmotaal, Minia University, Egypt. The supporting applicant is IASPEI represented by the IASPEI Secretary General, Peter Suhadolc, University of Trieste, Italy. The Project Principal Participant of the IASPEI supporting applicant is Rashad Kebeasy, National Research Institute of Astronomy and Geophysics, Egypt. 2. Activities and Achievements A number of very important activities and tasks of the project have been achieved during the course of the IUGG grant. They are summarized in the following sections. 2.1 Collecting Gravity Data This task represents the core of the project. It is a very hard task, since most institutions don't like to release the gravity data they have. A very laborious work has been done by the IAG PPP, Hussein Abd-Elmotaal, to collect the gravity data along the life time of the project (even before starting the IUGG grant). Figures 1 to 4 show the development achieved in collecting the land and ocean gravity data for Africa in the course of the project. The currently available data consist of land, shipborne and altimetry derived gravity anomalies data (cf. Fig. 4). It should be mentioned that collecting the gravity data is a dynamic process, and additional data are seeked for and hopefully it will become available in the second phase of the project.