# Contour line

### From Fiswiki

** Contour line** (also

**isoline**or isarithm) of a function of two variables is a curve along which the function has a constant value. In cartography, a contour line (often just called a "contour") joins points of equal

**elevation**(

**height**) above a given level, such as

**mean sea level**.

** Contour line** for a function of two variables is a curve connecting points where the function has the same particular value. The gradient of the function is always perpendicular to the contour lines.

When the lines are close together the magnitude of the gradient is large: the variation is **steep**. A level set is a generalization of a contour line for functions of any number of variables.

## [edit] **Also See**

**Global Positioning System****Vertical drop****latitude****longitude****time****Geographic information systems**(**GIS**)**Georeference**

## [edit] **Reference;**

- See Wikipedia
**Contour lines**[1]

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