Last modified August 3, 2007
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Also known as Equirectangular, Simple Cylindrical, Rectangular, or Plate Carrée (if the standard parallel is the equator).
This projection is very simple to construct because it forms a grid of equal rectangles. Because of its simple calculations, its usage was more common in the past. In this projection, the polar regions are less distorted in scale and area than they are in the Mercator projection.
Learn more about the Mercator projection
This simple cylindrical projection converts the globe into a Cartesian grid. Each rectangular grid cell has the same size, shape, and area. All the graticular intersections are 90°. The central parallel may be any line, but the traditional Plate Carrée projection uses the equator. When the equator is used, the grid cells are perfect squares, but if any other parallel is used, the grids become rectangular. In this projection, the poles are represented as straight lines across the top and bottom of the grid.
Learn more about the Plate Carrée projection
Tangent at the equator or secant at two parallels symmetrical around the equator.
All meridians and all parallels.
Noticeable distortion of all properties away from standard parallels.
Best used for city maps or other small areas with map scales large enough to reduce the obvious distortion.
Used for simple portrayals of the world or regions with minimal geographic data. This makes the projection useful for index maps.