plane

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As noted above, the plane of reference for this work, mean sea level was derived from a short series of tide observations made by Marindin at Chatham in 1887.
Using the average value, Figure 15 illustrates the relationship between Marindin's mean sea level datum and the NAVD88 plane of reference.
The benchmarks set by Marindin between 1887 and 1889 serve to memorialize the plane of reference used in his extensive work along the outer shores of Cape Cod.