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Translation

ISOM 2017-2 Name of symbol 101
English
Contour
7/100 · 7

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Key English Dutch Actions
ISOM 2017-2
Color 30
White over yellow
 
ISOM 2017-2
Color 31
Black for open land
 
ISOM 2017-2
Color 32
Yellow
Geel
ISOM 2017-2
Color 33
Yellow 100% for area features
 
ISOM 2017-2
Color 34
Yellow 50%
Geel 50%
ISOM 2017-2
Name of symbol 101
Contour
Contour
ISOM 2017-2
Description of symbol 101
A line joining points of equal height. The standard vertical interval between contours is 5 m. A contour interval of 2.5 m may be used for flat terrains.
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.
A closed contour represents a knoll or a depression. A depression has to have at least one slope line. Minimum height/depth should be 1 m.
Relationships between adjacent contour lines are important. Adjacent contour lines show form and structure. Small details on contours should be avoided because they tend to hide the main features of the terrain.
Prominent features such as depressions, re-entrants, spurs, earth banks and terraces may have to be exaggerated.
Absolute height accuracy is of little importance, but the relative height difference between neighbouring features should be represented on the map as accurately as possible. It is permissible to alter the height of a contour slightly if this improves 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 line is 0.25 mm from centre to centre of the line (footprint 4 m). The mouth of a re-entrant or a spur must be wider than 0.5 mm from centre to centre of the line (footprint 8 m).
The minimum length of a contour knoll is 0.9 mm (footprint 13.5 m) and the minimum width is 0.6 mm (footprint 9 m) outside measure. Smaller prominent knolls can be represented using symbol Small knoll (109) or Small elongated knoll (110) or they can be exaggerated on the map to satisfy the minimum dimension.
A depression must accommodate a slope line, so the minimum length is 1.1 mm (footprint 16.5 m) and the minimum width is 0.7 mm (footprint 10.5 m) outside measure. Smaller, prominent depressions can be represented using symbol Small depression (111) or they can be exaggerated to satisfy the minimum dimension.
Contours should be adapted (not broken) in order not to touch symbol Small knoll (109) or Small elongated knoll (110).
 
ISOM 2017-2
Name of symbol 101.1
Slope line, contour
Hoogtelijn, dalzijde
ISOM 2017-2
Description of symbol 101.1
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.
A depression has to have at least one slope line.
 
ISOM 2017-2
Name of symbol 102
Index contour
Geaccentueerde hoogtelijn
ISOM 2017-2
Description of symbol 102
Every fifth contour shall be drawn with a thicker line. This is an aid to the quick assessment of height difference and the overall shape of the terrain surface.
An index contour may be represented as an ordinary contour line in an area with much detail. Small contour knolls and depressions are normally not represented using index contours.
The index contour level must be carefully selected in flat terrain. The ideal level for the index contour is the central contour in the most prominent slopes.
 

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String information

Key
ISOM 2017-2
Name of symbol 101
String age
4 years ago
Last updated
a year ago
Source string age
4 years ago
Translation file
translations/map_symbols_nl.ts, string 36