The Difference between projection and datum
In the context of geography and mapping, the terms “projection” and “datum” refer to different aspects of the coordinate system used to represent the earth’s surface.
A projection is a mathematical method for representing the curved surface of the earth on a flat map. There are many different map projections, each with its own set of strengths and limitations. Some common map projections include the Mercator projection and the Robinson projection.
A datum, on the other hand, is a reference frame or set of parameters that is used to define the coordinates of a map projection. A datum consists of an origin point, a set of orientation parameters, and a set of scale factors. The choice of datum can affect the accuracy and precision of a map, as different datums may result in slight shifts or deformations in the map’s coordinates.
In summary, a projection is a way of representing the earth’s surface on a map, while a datum is the reference frame or set of parameters used to define the coordinates of that map. Both play important roles in accurately representing the earth’s surface.