See Also...302 303 ISOM Index Water and marsh index previous next
revision
05/00
301 Lake
Large areas of water are shown with a dot screen. Small areas of water should be shown with full colour. A black bank line indicates that the feature cannot be crossed.
Colour: blue 50% (60 lines/cm), black.
Bank line width 0.18mm
Large areas of water are shown with full colour or a dot screen of at least 50%. Small areas of water should be shown with full colour. A black bank line indicates that the feature cannot be crossed.
The default OCAD file uses 301.1 as a bank line (0.18mm black) and 301.0 as the infill blue colour. This blue is a 50% tone. If full colour blue is needed then use 302.0, the pond symbol as the fill.
The default blue fill may be drawn with any drawing tool, but the bézier tool is the most efficient. As the defined colour will overprint all others, but will not knock it out there is a need to cut out an underlying symbol. This is particularly the case with yellow and green, but also applies to other symbols.
Remember to draw the bank line around any islands. (Holes in areas can be independently selected and the bank symbol added with the outline/fill tool).
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.
A black line round a water feature indicates that the feature cannot be crossed under normal weather conditions. The line is broken where the water may be crossed see 304.
See minimum dimensions but specifically -
- Smallest area of colour
Blue full colour: 0.5mm˛
Blue dot screen: 1.0mm˛.
A significant area of water, normally uncrossable.
The problem with colour clashes is that the screen and composite (local printer) output does not necessarily reflect the separated output.
If you digitise your map in the same way as you would draw it, that is, you cut out all underlying objects beneath the blue, then there is no colour problem (greening of the lakes).
There are alternatives, the most common method is to make the blue colours automatically knockout the lower colours. To do this, you have to change the colour table. Put zeros ( “-1”'s for OCADv5) in the blue row in each colour column that you want to knockout. Only the colours lower down the colour table are affected. So there will be no effect on symbols using black and street colours.
There are more details in the Main Help File or in the Colour Help file.
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