Optional heightUnit
heightUnit: "meters" | "feet" | "us-feet" | "clarke-feet" | "clarke-yards" | "clarke-links" | "sears-yards" | "sears-feet" | "sears-chains" | "benoit-1895-b-chains" | "indian-yards" | "indian-1937-yards" | "gold-coast-feet" | "sears-1922-truncated-chains" | "50-kilometers" | "150-kilometers"
The surface type or height model of the vertical coordinate system (VCS).
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