See Also...112 115 ISOM Index Land forms index previous next
revision 01/00
117 Broken ground
An area of pits or knolls which is too intricate to be shown in detail. The density of dots may vary according to the detail on the ground.
Colour: brown.
Dot diameter 0.18mm - 0.25mm
As ISOM 2000 but sizes were 0.175mm - 0.25mm
with coverage of 15% or coverage according to detail (ambiguous).
This symbol is now available for use with marsh,
indistinct marsh, open land, or
open land with scattered trees,
combinations that were previously not allowed.
Defined as a single point symbol 117.0, can be drawn with any drawing tool.
Should not be surveyed if they consist of the diggings of animals such as badger setts (environmental impact).
If the area is only lightly broken and would not impede progress, it is acceptable to leave it out.
The ISOM lays down the permissible combination of screens.
Broken ground is allowed with marsh, indistinct marsh, open land, open land with scattered trees, rough open land, rough open land with scattered trees, forest: slow running, undergrowth: slow running, forest: difficult to run, undergrowth: difficult to run, and vegetation: very difficult to run,
but not with stony ground, or uncrossable marsh.
Clearly disturbed ground with features too small or too numerous to be mapped individually; including animal earths.
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