See Also...523 524 ISOM Index Man-made features index previous next
A wooden or wire fence less than ca. 1.5 m high.
Line widths 0.14mm
tag length 0.5mm, spacing 2.5mm, tag angle 60º
As ISOM 2000 but line width was 0.125mm
ISOM number changed from 523 to 522.
Defined as line symbol 522.0. Can be drawn with any tool but bézier or straight line modes are preferable.
If the bézier tool is used, care must be taken as tag spacing is dependent on location of nodes and handles. See bézier topic for more information.
The default definition has the fence tags going in the wrong direction compared with the ISOM. The defined angle should be 120º (Mike Godfree)
See the Variations in Symbols topic for details.
a wire or wooden boundary.
1) If the fence 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.
Using a black 0.12mm line, the distinct cultivation boundary symbol (414) is no longer suitable due to the ISOM2000 revisions.
2) Enclosures, fences parallel to roads.
These features are often constructed parallel to roads and tracks, and are sometimes drawn poorly. The eye easily spot objects out of true. When digitising make use of the control key to follow an existing line, then edit the object away to the correct position.
3) Reverse Line Tool
The usual use of this tool is to reverse a crag or embankment symbol where the tags are on the wrong side. The fence and high fence symbol also can benefit from the tags being on the "less busy" side, tags should not swap from one side to another.
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