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Slope line 104

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This page contains content from ISOM2000   This page contains content from Ashby Mapping  Ski-O symbol  Mountain Bike-O symbol  revision 05/00

Specifications

104 Slope line

Slope lines may be drawn on the lower side of a contour line, eg. along the line of a re-entrant or in a depression. They are used only where it is necessary to clarify the direction of slope.

Colour: brown.

Line width 0.14mm, tag length 0.5mm

ISOM 1990 Definition

Slope lines may be drawn on the lower side of a contour line, eg. along the line of a re-entrant or in a depression. They are used only where it is necessary to clarify the fall of the ground.

OCAD Methods

No symbol is provided in the default.ocd symbol set. The feature may be drawn by using symbol 101 (contour). However this will give the tags round ends unless the default contour definition is altered.

Drawing Considerations

A good compromise between the usual extremes of no contour tags, and, even worse, tags at even spacing, is required. To reiterate - they are used only where it is necessary to clarify the fall of the ground.

1) It is best to define a tag symbol for two reasons:-

to get the correct tag length

and to have square ended tags, the use of default symbol 101 gives a rounded end tag.

2) Define a tag using a horizontally drawn line.

This has the effect of allowing a tag to be placed by dragging along the contour, the tag is then drawn at a right angle to the contour.

3) to add a quick tag of the right length:-

select the contour,

click symbol 106 (earth bank),

click the change symbol tool to temporarily change the contour to an earth bank,

if necessary, change the direction of the new earth bank so that the tags fall downhill,

add tags as needed using the earthbank tags as guides for the correct angle and length,

click on 101, contour and change the contour back again.

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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
Apologies for any mistakes and errors; please inform details of any problems, thanks.
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