See Also...401 210 ISOM Index Rock and boulders index previous next
revision 05/00
212 Bare rock
A flat area of rock without earth or vegetation is shown as bare rock. An area of rock covered with grass, moss or other low vegetation is shown as open land (401/402).
Colour: black 30% (60 lines/cm) or grey.
As ISOM 2000 but line frequency changed from 54 to 60 lines/cm.
Defined as an area symbol, 212.0 which can be drawn with any drawing tool.
See minimum dimensions but specifically -
- Smallest area of colour grey or black dot screen : 0.5mm˛.
The ISOM lays down the permissible combination of screens.
There is no mention of this symbol in the combination section of the specifications. The inference is that this screen should remain on its own, no combinations allowed.
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