101 Contour

Geometry: line.

Definition

A line joining points of equal height. The standard vertical interval between contours is 2 or 2.5 m. To emphasize the 3-dimensional effect of the contour line image, contour lines shall be represented as continuous lines through all symbols, also Building (521) and Canopy (522).

Slope lines may be drawn on the lower side of a contour line to clarify the direction of slope. When used, they should be placed in re-entrants.

However, contour lines shall be cut out for better legibility, if they touch the following symbols: Small earth wall (105), Small depression (111), Pit or hole (112), Prominent landform feature (115), Stairway (532). Contours shall be adapted or broken in order not to touch symbols Small knoll (109) or Small elongated knoll (110).

The relative height difference between neighbouring features must be represented on the map as accurately as possible. Absolute height accuracy is of less importance. It is permissible to alter the height of a contour slightly if this will improve the representation of a feature. This deviation should not exceed 25% of the contour interval and attention must be paid to neighbouring features. The smallest bend in a contour is 0.4 mm from
centre to centre of the line.

Parameters

Colour: brown.

Comments

The definition of this map symbol was updated on 01.02.2024: Change of text: Contours shall be adapted or broken…

The definition of this map symbol was updated on 21.02.2022: Change of the text: Contour lines shall be adapted or, if not possible, cut in order not to touch symbols Small knoll (109) or Small elongated knoll (110).

The definition of this map symbol was updated on 17.05.2020: Adding Stairway (532) as a symbol, where contour lines shall be cut out for better legibility.