See Also...406 408 410 ISOM Index Vegetation index previous next
revision 01/00
411 Forest runnable in one direction
When an area of forest provides good running in one direction but less good in others, white stripes are left in the screen symbol to show the direction of good running.
Colour: green.
Dimensions: - gap 0.4mm, space gap to gap 1.5mm.
As ISOM 2000 but spacing between gaps is now defined.
Defined as area symbol 411.0, and can be drawn with any drawing tool.
Care is needed at joins, overlap only where it is safe (usually if it is the same colour and always if it is the same symbol). If you need to share a common boundary with another symbol, draw along the edge with the control key to follow it exactly.
This is a rotatable symbol, the pattern of the fill can be rotated with the direction tool and will rotate with the map if the “include symbols” box is checked when the map is turned. This is not the same as using the rotation tool which turns the whole object, but not the fill pattern.
See minimum dimensions but specifically -
- Smallest area enclosed by a dotted line: 1.5 mm (diameter) with 5 dots.
- Smallest area of colour green full colour: 0.5mm˛.
There is a runnability topic.
The ISOM lays down the permissible combination of screens.
There is no mention of this symbol in the combination section of the specifications. The combination that are appropriate for the green runnability symbols should be adopted:
Forest forest: slow running, forest: difficult to run, and vegetation: very difficult to run) is allowed with broken ground, stony ground, marsh, and indistinct marsh,
but not with uncrossable marsh, open land, open land with scattered trees, rough open land, rough open land with scattered trees, undergrowth: slow running, forest: difficult to run, undergrowth: difficult to run, or vegetation: very difficult to run.
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