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    Author(s): Neil A. Clark; Randolph H. Wynne; Daniel L. Schmoldt; Matt Winn
    Date: 2000
    Source: In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 353-363.
    Publication Series: General Technical Report (GTR)
    Station: North Central Research Station
    PDF: View PDF  (848.96 KB)

    Description

    A digital camera was used to measure diameters at various heights along the stem on 20 red oak trees. Diameter at breast height ranged from 16 to over 60 cm, and height to a 10-cm top ranged from 12 to 20 m. The chi-square maximum anticipated error of geometric mean diameter estimates at the 95 percent confidence level was within ±4 cm for all heights when obtained at a distance of 12 m or greater. Error increased with increased stem height from ±3 to ±7 cm for heights from 1 to 20 m. In general, the error is equivalent to three times the instrument precision, which varies with distance. Two-thirds of the volume estimates were within 8 percent of "actual" volumes.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Clark, Neil A.; Wynne, Randolph H.; Schmoldt, Daniel L.; Winn, Matt 2000. Digital terrestrial photogrammetric methods for tree stem analysis. In: Hansen, Mark; Burk, Tom, eds. Integrated tools for natural resources inventories in the 21st century. Gen. Tech. Rep. NC-212. St. Paul, MN: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station. 353-363.

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