conic projection
Definition
- Noun:
- A map projection of the globe onto a cone: A method of representing the Earth's surface on a flat map by projecting it onto a cone placed over the globe. The cone is typically positioned so that its point is directly above one of the Earth's poles, and it touches the globe along a standard parallel of latitude.
Usage
- Noun:
- Cartographers often use a conic projection to map mid-latitude regions with minimal distortion.
- The Albers equal-area projection is a specific type of conic projection.
Advanced Usage
- "Standard parallel" in conic projection: In a conic projection, the line(s) of latitude where the cone touches or slices through the globe are called standard parallels. Scale is true along these lines, and distortion increases away from them.
- For this map, the conic projection uses two standard parallels at 20°N and 60°N.
Variants and Related Words
Conical projection: A synonym for conic projection.
- The conical projection is well-suited for mapping countries like the United States.
Lambert conformal conic projection: A specific, common type of conic projection that preserves local angles (conformality).
- Aeronautical charts frequently use the Lambert conformal conic projection.
Synonyms
- Conical map projection: An alternative term with the same meaning.
Related Concepts
- Map projection: The general category of methods for representing a spherical surface on a plane, of which a conic projection is one type.
- Secant projection: A conic (or other) projection where the developable surface (the cone) intersects the globe along two lines (standard parallels), reducing overall distortion.
Noun
-
a map projection of the globe onto a cone with its point over one of the earth's poles
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