See Also...402 403 ISOM Index Vegetation index previous next
revision 05/00
404 Rough open land with scattered trees
Where there are scattered trees in rough open land, areas of white (or green) should appear in the tone. Such an area may be generalised by using a regular pattern of large white dots in the yellow screen. Areas smaller than 16mm² in the map’s scale are shown as rough open land (403). Individual trees may be added (418, 419, 420).
Colour: yellow 70% (60 lines/cm), white 48.5% (14.3 lines/cm).
Dot diameter 0.55mm, diagonal spacing 0.7mm
Although the specification does not state the orientation, it is generally accepted that this symbol is oriented with the white dots aligned at 45º.
Where there are scattered trees in rough open land, areas of white (or green) should appear in the tone. Such an area may be generalised by using a regular pattern of large white dots in the yellow screen.
Colour: yellow 50% (40 lines/cm), white 50% (16.75 lines/cm).
Dot diameter 0.4mm, diagonal spacing 0.6mm
Defined as area symbol 404.0, and can be drawn with any drawing tool.
A new yellow colour is needed for this symbol defined as 70% of the full tone. The colour will only be needed for this symbol.
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: 1.5mm (diameter) with 5 dots.
- Smallest area of colour yellow dot screen: 1.0mm².
This symbol is typically used as a buffer between a wooded area and an open area. It is very unlikely to be edged with the distinct vegetation boundary symbol.
The runnability should be slow, or the open land with scattered trees symbol should be used.
The ISOM lays down the permissible combination of screens.
Rough open land with scattered trees is allowed with broken ground, stony ground, marsh, indistinct marsh, undergrowth: slow running, undergrowth: difficult to run, and now uncrossable marsh,,
but not with open land, open land with scattered trees, rough open land, forest: slow running, forest: difficult to run, or vegetation: very difficult to run
Semi-open land: an area of scattered trees.
There is a problem with the joining of these areas. Where a large area is made out of two or more overlapping areas, one area knocks out the underlying edge. This appears a clean join on the screen but the filled area covers the dots at the join on the output.
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