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However, as the tree is heavily buttressed, and irregular in shape, a calculation of nominal diameter, defined as the cross-sectional wood area expressed as a circle, gives this tree a diameter at breast height of 30.8 feet (9.4 m)—a much smaller number, but a more accurate representation of the tree's size. [10]
Tree height is the vertical distance between the base of the tree and the highest sprig at the top of the tree. The base of the tree is measured for both height and girth as being the elevation at which the pith of the tree intersects the ground surface beneath, or "where the acorn sprouted."
Tree heights can be directly measured using a pole for shorter trees, or by climbing a larger tree and measuring the height via a long measuring tape. Pole measurements [ 30 ] [ 31 ] work well for small trees eliminating the need for trigonometry involving multiple triangles, and for trees shorter than the minimal range for laser rangefinders.
Christmas tree decorated with lights, stars, and glass balls A Christmas Tree in the US, 1923 North American family decorating Christmas tree (c. 1970s). A Christmas tree is a decorated tree, usually an evergreen conifer, such as a spruce, pine or fir, or an artificial tree of similar appearance, associated with the celebration of Christmas.
Cut evergreen trees were used in 1923 and from 1954 to 1972. Living trees were used from 1924 to 1953, and again from 1973 to the present (2011). In the list below, the height of the cut tree is the height of the tree when raised at the White House. The height of the living tree is the height when it was first planted.
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