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Any of several types of line on a map, chart or graph that link points having the same value of a parameter.

The bottom part of the diagram shows some contour lines with a straight line running through the location of the maximum value. The curve at the top represents the values along that straight line.

Any of several types of line on a map, chart or graph that link points having the same value of a parameter.

A three-dimensional surface, whose contour graph is below.

Any of several types of line on a map, chart or graph that link points having the same value of a parameter.

A two-dimensional contour graph of the three-dimensional surface in the above picture.