An equirectangular projection is a cylindrical equidistant projection, also called a rectangular projection, plane chart, plate carre, or unprojected map, in which the horizontal coordinate is the longitude and the vertical coordinate is the latitude, so the standard parallel is taken as .
See alsoCylindrical Equidistant Projection
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Weisstein, Eric W. "Equirectangular Projection." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/EquirectangularProjection.html