Category Archives: map making

Datum, Ellipsoid, Rhumb Line, Secant, Spheroid, Tangent and other useful terms in Map Projection

Posted on February 12, 2008 by Rashid Faridi

Datum—A reference for position on the surface of the Earth. In surveying, a datum is a reference system for computing or correlating the results of surveys. There are two principal types of datums: vertical and horizontal. A vertical datum is … Continue reading →

Posted in Class Notes, Geography Practicals/Lab and Statistical Techniques, map making | 4 Comments