Visual segmentation, a technique for estimating cubic foot volume of woodland tree species, was compared with actual volume measurement. Comparison was made during a forest inventory of pinyon-juniper woodlands in Nevada and Utah. The visual technique's accuracy, its usefulness in developing volume equations, and applicability to volume inventory were studied. This study indicated visual segmentation is not reliable for estimating volume for a single tree. However, a sample of visually estimated volumes proved adequate for developing volume equations. In an application, a bias of 0 to -9 percent of the mean cubic foot volume per acre resulted from summary of 176 plots, using volume equations developed with visually estimated data. An appendix includes a complete description of the visual volume estimation technique for field use.
United States Department of Agriculture, Forest Service, "Woodland Tree Volume Estimation: A Visual Segmentation Technique" (1985). Forestry. Paper 17.