Form-class segmented-profile equations for 58 southern tree species and species groups are presented.The profile equations are based on taper data for 13,469 trees sampled in natural stands in many locations across the South.The profile equations predict diameter at any given height, height to give diameter, and volume between two heights.Equation coefficients for use in estimating diameters and volumes inside and outside bark are presented. D.b.h. and total height, d.b.h. and height to 4-inch top, d.b.h and height to 9-inch top (hardwoods), and d.b.h and height to 7-inch top (softwoods) are used as predictors.A measure of diameter at 17.3 feet is required also, and equations are presented for estimating d.o.b. and d.i.b. at 17.3 feet from d.b.h. and height.Equations for estimating d.i.b. at 4.5 and 17.3 feet from d.o.b. are given.
d.o.b. and d.i.b. equations
Clark, Alexander, III; Souter, Ray A.; Schlaegel, Bryce E. 1991. Stem Profile Equations for Southern Tree Species. Res. Pap. SE-282. Asheville, NC: U.S. Department of Agriculture, Forest Service, Southeastern Forest Experiment Station. 117 p.