Interpolation algorithm (default LINEAR).
Lagrange interpolation degree (uses degree+1 control points). Default 1 (= linear).
Number of samples.
The time the property first/last has a value, or null if it never varies.
Add one ECEF sample at epoch-seconds t (kept sorted; replaces an exact-time dup).
Add a sample from a geodetic position (degrees + meters).
ECEF position at epoch-seconds t, or null when undefined at that time.
A position defined by timestamped ECEF samples, interpolated between them — the analog of CesiumJS
SampledPositionProperty. Samples are kept sorted;getValueEcefclamps to the first/last sample outside the sampled range (so a tracked object holds at the ends rather than vanishing). Linear and Lagrange (configurable degree) interpolation.