Geo-referencing in Tunisia everything you'll never learn at school
Positioning errors are frequent and largely stem from the misconception that providing latitude and longitude (Lat/Long) coordinates offers complete information. In reality, this is far from true. These errors also arise because this discipline is often taught purely in theory, focusing on the various types of global projections, without addressing the practical realities specific to Tunisia. Drawing from examples of oil well positioning and errors found in final well reports, this document delivers a comprehensive and practical overview of the projection systems employed in Tunisia. WHAT YOU NEED TO KNOW Tunisia uses an official referencing system known as the Carthage Datum . What lies behind the term "Datum" is essentially a system of angular coordinates and an ellipsoid defined by its dimensions. Carthage Datum simply means that we're talking about the Clarke 1880 IGN ellipsoid , which has the following characteristics: the dimension of the semi-major axis
