A surface deviation map overlays measured geometry onto the nominal CAD model and colours every point by how far it deviates. Green typically means on-nominal; cool colours indicate material below nominal, and warm colours indicate material above.
Because the whole surface is coloured at once — not just a handful of probed points — deviation maps make it immediately obvious where a forming, casting, or machining process is drifting, so corrective action can be targeted rather than guessed.
When you set sensible tolerance bands, the map becomes a fast pass/fail communication tool that even non-metrologists on the production floor can read at a glance.
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