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# CONSTANT OF THE CONE

 The chart convergence factor for a conic projection

## Related Terms

### CONIC CHART

A chart on a conic projection

### CONIC CHART WITH TWO STANDARD PARALLELS

A chart on the conic projection with two standard parallels. Also called SECANT CONIC CHART.

### CYLINDRICAL CHART

A chart on a cylindrical map projection

### CONIC MAP PROJECTION

A map projection in which the surface of a sphere or spheroid, such as the earth, is conceived as projected onto a tangent or secant cone which is then developed into a plane. In a simple conic map projection the cone is tangent to the sphere or spheroid, in a conic map projection with two standard parallels the cone intersects the sphere or spheroid along two chosen parallels, and in a polyconic map projection a series of cones are tangent to the sphere or spheroid

### GNOMONIC CHART

A chart constructed on the gnomonic projection and often used as an adjunct for transferring a great circle to a Mercator chart. Commonly called GREAT CIRCLE CHART

### POLYCONIC MAP PROJECTION

A conic map projection in which the surface of a sphere or spheroid, such as the earth, is conceived as developed on a series of tangent cones, which are then spread out to form a plane. A separate cone is used for each small zone. This projection is widely used for maps but seldom used for charts, except for survey purposes. It is not conformal.

### CONIC MAP PROJECTION WITH TWO STANDARD PARALLELS

A conic map projection in which the surface of a sphere or spheroid is conceived as developed on a cone which intersects the sphere or spheroid along two standard parallels, the cone being spread out to form a plane. The Lambert conformal map projection is an example. Also called SECANT CONIC MAP PROJECTION.

### LAMBERT CONFORMAL CHART

A chart on the Lambert conformal projection

### EQUATORIAL CHART

1. A chart of equatorial areas. 2. A chart on an equatorial map projection

### SIMPLE CONIC MAP PROJECTION

A conic map projection in which the surface of a sphere or spheroid, such as the earth, is conceived as developed on a tangent cone, which is then spread out to form a plane.

### Related questions

MarineProHelp 2018 - 2020

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