UnitCartesian3Value - AnalyticalGraphicsInc/czml-writer GitHub Wiki
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A three-dimensional unit magnitude Cartesian value specified as [X, Y, Z]. If the array has three elements, the value is constant. If it has four or more elements, they are time-tagged samples arranged as [Time, X, Y, Z, Time, X, Y, Z, ...], where Time is an ISO 8601 date and time string or seconds since epoch.
Type: array