The Tunisian Association of Digital Geographic Information and in cooperation with an important number of universities, organizations, companies and institutions concerned with geographic information systems and spaces sciences, organizes : The Fourth Session Of The International Congress Geo Tunisia 2009 “Survey of the hydraulic resources and of desertification by using the geographic information systems, remote detection and numeric designing “ On 16/20 December 2009 in Tunis

The invitation is addressed to the various researchers, the academicians, the institutions, the research centres, the private and public enterprises to participate in the different manifestations of the Congress in which shall presented work papers, surveys, experimental researches and workshops in addition to the geo-technological exhibition held at this occasion under the sponsorship of  well known international institutions that are active in the geographic information systems and remote detection, and its various applications in the hydraulic resources and desertification.