This is also featured in Visual Explanations (Tufte) where colour gradation is used to indicate depth. Also a sea level datum is represented using colour differentiation. You could also introduce a datum to your own mappings, indicating a particular feature or threshold. Note also the grey lines- shipping channels, and the coloured contours- so as to emphasize the whole land mass- and differentiate from the sea. Your mapping could also have similar analytical + representative features
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