See Also...104 111 ISOM Index Land forms index previous next
revision 01/00
103 Form line
An intermediate contour line. Form lines are used where more information can be given about the shape of the ground. They are used only where representation is not possible with ordinary contours. Only one form line may be used between neighbouring contours. Also the following paragraph is in the introduction to 4.1 Land Forms: - Excessive use of form lines should be avoided as this will complicate the map and give a wrong impression of height differences. If the representation of an area needs a large number of form lines, a smaller contour interval provides a more legible alternative
Colour: brown.
Line width 0.14mm, line length 1.25mm, gap 0.25mm
As ISOM 2000 but line width was 0.125mm
Defined as line symbol 103.0. Can be drawn with any tool but bézier mode is preferable.
If the bézier tool is used, care must be taken as gap spacing is dependent on location of nodes and handles. See bézier topic for more information.
The default definition has a gap between dashes of 0.3mm, compared with the ISOM specified 0.25mm. Variation is allowed in the specification, see the Variations in Symbols topic for details.
Check the general comments on land forms note especially the following:-
Excessive use of form lines should be avoided as this will complicate the map and give a wrong impression of height differences. If the representation of an area needs a large number of form lines, a smaller contour interval provides a more legible alternative.
See minimum dimensions but specifically - shortest dashed line: at least two dashes.
Terrace:- a level area on a slope
First try adding a node at, or close to, the junction, next try the cut and reverse line tools. If the spacing is still incorrect, cut back and add an extra line at the junction, either with or without gaps.
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