OpenOrienteering/Map Symbols — English @ Hosted Weblate: Form lines are used where more information must be given …

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Form lines are used where more information must be given about the shape of the ground. Form lines are added only where representation would be incomplete with ordinary contours. They shall not be used as intermediate contours. Only one form line should be used between neighbouring contours. It is very important that a form line fits logically into the contour system, so the start and end of a form line should be parallel to the neighbouring contours. The gaps between the form line dashes must be placed on reasonably straight sections of the form line. Form lines can be used to differentiate flat knolls and depressions from more distinct ones (minimum height / depth should be 1 m). Excessive use of form lines must be avoided as this disturbs the three-dimensional picture of the ground shape and will complicate map reading.
Minimum length (non-closed): two dashes.
Minimum length of a form line, knoll or depression: 1.1 mm (footprint 16.5 m)

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	Key	English	Actions
	ISOM 2017-2 Name of symbol 102	Index contour
	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.
	ISOM 2017-2 Name of symbol 102.1	Contour value
	ISOM 2017-2 Description of symbol 102.1	An index contour may have a height value assigned. A height value should only be inserted in an index contour in places where other detail is not obscured. It shall be orientated so that the top of the label is on the higher side of the contour. The index value (label) shall be 1.5 mm high and represented in a sans-serif font.
	ISOM 2017-2 Name of symbol 103	Form line
	ISOM 2017-2 Description of symbol 103	Form lines are used where more information must be given about the shape of the ground. Form lines are added only where representation would be incomplete with ordinary contours. They shall not be used as intermediate contours. Only one form line should be used between neighbouring contours. It is very important that a form line fits logically into the contour system, so the start and end of a form line should be parallel to the neighbouring contours. The gaps between the form line dashes must be placed on reasonably straight sections of the form line. Form lines can be used to differentiate flat knolls and depressions from more distinct ones (minimum height / depth should be 1 m). Excessive use of form lines must be avoided as this disturbs the three-dimensional picture of the ground shape and will complicate map reading. Minimum length (non-closed): two dashes. Minimum length of a form line, knoll or depression: 1.1 mm (footprint 16.5 m)
	ISOM 2017-2 Name of symbol 103.1	Slope line, formline
	ISOM 2017-2 Description of symbol 103.1	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.
	ISOM 2017-2 Name of symbol 104	Earth bank
	ISOM 2017-2 Description of symbol 104	An earth bank is an abrupt change in ground level which can be clearly distinguished from its surroundings, e.g. gravel or sand pits, road and railway cuttings or embankments. Minimum height: 1 m. An earth bank may impact runnability. The tags represent the full extent of the earth bank. For long earth banks it is allowed to use tags shorter than the minimum length at the ends. If two earth banks are close together, tags may be omitted. Impassable earth banks shall be represented using symbol impassable cliff (201). Minimum length: 0.6 mm (footprint 9 m).
	ISOM 2017-2 Name of symbol 104.1	Earth bank, minimum size

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ISOM 2017-2
Description of symbol 103

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4 years ago

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11 months ago

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