An equal-area map projection in which parallels and the prime meridian are straight lines and the other meridians are increasingly curved outward from the prime meridian.
An equal-area map projection showing the entire surface of the earth with all lines of latitude as straight lines and all lines of longitude as curved lines.
A map projection in which the parallels and a central meridian, usually the prime meridian, are straight lines and the other meridians are curved outward from the central meridian. Sinusoidal projection maps present accurate area and distance at every parallel and at the central meridian; distortion increases at the outer meridians and at high latitudes. It is often used in atlases to map Africa and South America.