Optional unit
unit: "square-millimeters" | "square-centimeters" | "square-decimeters" | "square-meters" | "square-kilometers" | "square-inches" | "square-feet" | "square-yards" | "square-miles" | "square-us-feet" | "acres" | "ares" | "hectares" | "imperial" | "metric"
Unit system (imperial, metric) or specific unit used for displaying the computed area in the view.
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