I try to find the meaning of the categories DN and DRVAL2 when I used them in the command:
lrenderer = new QgsCategorizedSymbolRendererV2("DRVAL2" , Categrories );
Is there any tutorial or documentation about all of this kind of parameter ?
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After a little googling : http://www.caris.com/s-57/attribut/drval2.htm
DRVAL2 => 'The maximum (deepest) value of a depth range'
DN is generally => Digital Number