The Sanson-Flamsteed Projection is a cartographic projection used to display the entire world on a flat surface. Some synonyms for this projection include the "double mercator," "rectangular," or "Plate Carree" projection. The double mercator description comes from the fact that it uses two mercator projections, while rectangular is self-explanatory given the shape of the projection. Plate Carree refers to the use of the equidistant cylindrical projection, which is also known as the "geographic projection." Other related synonyms include the equirectangular projection and the simple cylindrical projection. While these names may vary, they all refer to a similar mapping technique used to create flat maps of the world.