Many projections are conceptually created by projecting from one geometric shape (a sphere) onto another (a cone, cylinder, or plane). However, other projections are not related as easily to a cone, cylinder, or plane.
- Learn more about conic projections
- Learn more about cylindrical projections
- Learn more about planar projections
Pseudo projections have some of the characteristics of another class of projection. For example, the sinusoidal projection is called pseudo cylindrical because all lines of latitude are straight and parallel and all meridians are equally spaced. However, it is not truly a cylindrical projection because all meridians except the central meridian are curved. This results in a map of the earth having an oval shape instead of a rectangular shape.
Learn more about the sinusoidal projection.
Other projections are assigned to special groups, such as circular or star.