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Passable rock face 203

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This page contains content from ISOM2000   This page contains content from Ashby Mapping    revision 01/00

Specifications

203 Passable rock face A small vertical rock face (minimum height 1m) is shown without tags. If the direction of fall of the rock face is not apparent from the contours or to improve legibility, short tags should be drawn in the direction of the fall. For passable rock faces shown without tags the ends of the line may be rounded to improve legibility. Colour: black Line width 0.18mm (tag 0.12mm) tag length 0.5mm, spacing 0.5mm minimum line length (tagless line) 0.6mm

ISOM 1990 Definition

A small vertical rock face (minimum height 1m) is shown without tags. If the direction of fall of the rock face is not apparent from the contours, short tags should be drawn in the direction of the fall.
Also the line sizes have altered.

OCAD Methods

Defined as line symbol 203.0, and 203.1 for the tagless symbol. As this is a line object it can be drawn with any tool. If the bézier tool is used, care must be taken as tag spacing and angle is dependent on location of nodes and handles. See bézier topic for more information.

OCAD default definition

The default definition specifies a gap between tags of 0.75mm, compared with the ISOM specified distance of 0.5mm. Variation is allowed in the specification, see the Variations in Symbols topic for details.

Drawing Considerations

If there is any danger to the runner then the impassable cliff symbol must be used. It has been standard practice in the UK to use the tagged symbol for all small cliffs, the tagless being used only where there is insufficient room to show the tags. The tags may also be extended to show the plan of the rock, as with symbol 201, also crossing into water if there is no passable way beneath the rock. (Non ISOM)

Pictorial Descriptions

- BOF Rules, Appendix One A rock slope steeper than 45 degrees.

1) If the cliff has a tight curve or sharp angle the tags tend to overlap. The solution is to cut out the central part of the curve and replace it with a plain black line. Use the default 203.1, passable rock face.

2) Longer tags are sometimes needed. Use a black 0.12mm line, the distinct cultivation boundary symbol (414) is suitable. Lines with tags (106,203) Tag spacing too wide.

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International Specification for Orienteering Maps produced by the International Orienteering Federation
OCAD produced by Hans Steinegger Software. © 1988-1999 Hans Steinegger. ® OCAD is a registered trademark of Hans Steinegger
This document has been written and coded by Peter Hornsby of Ashby Mapping
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Produced for the Ashby Mapping internet site on 20 November 1997 and 1 December 1999  ©1997-2000 Ashby Mapping
Revised 28 December 1999, 23 March 2000