Simple conical projection

World map in central conical projection

The simple conical projection is obtained by projecting the elements of the earth's spherical surface onto a secant conical surface, taking the vertex on the axis that joins the two poles.

The simple conic projection can have one or two reference parallels.

The mesh of meridians and parallels is drawn by projecting them onto the cone assuming a light source is located in the center of the globe. The cone itself is a geometric figure that can be developed in a plane.

The result is a semicircular map in which the meridians are straight lines arranged radially and the parallel arcs of concentric circles. The scale increases as we move away from the contact parallel between the cone and the sphere.

If you have two reference parallels

The secant cone cuts the globe. As we move away from them the scale increases but in the region between the two parallels the scale decreases. This is a representation of the earth that shows that the arrangement of the parallels is that it can have one or two difference