Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Neil Clark; Sang-Mook Lee
    Date: 2007
    Source: e-Gen. Tech. Rep. SRS–101. U.S. Department of Agriculture, Forest Service, Southern Research Station: 46-54 [CD-ROM].
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (574 KB)

    Description

    Assessing change in the amount of foliage within a tree’s crown is the goal of crown transparency estimation, a component in many forest health assessment programs. Many sources of variability limit analysis and interpretation of crown condition data. Increased precision is needed to detect more subtle changes that are important for detection of health problems. Digital photomonitoring can be used to increase the precision of these measures provided exact camera parameter replication is performed and movement of canopy structures is not severe. Two measures of transparency (compactness and DSO, or fractal dimension of silhouettes minus fractal dimension of outlines) show sensitivity to small branches or small canopy gaps, but may offer some unique descriptive information over area ratio measures. Point-wise and region-wise transparency distribution maps provide easy to interpret visual representations of localized transparency.

    Publication Notes

    • You may send email to pubrequest@fs.fed.us to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Clark, Neil; Lee, Sang-Mook. 2007. Digital photo monitoring for tree crown. e-Gen. Tech. Rep. SRS–101. U.S. Department of Agriculture, Forest Service, Southern Research Station: 46-54 [CD-ROM].

    Related Search


    XML: View XML
Show More
Show Fewer
Jump to Top of Page
https://www.fs.usda.gov/treesearch/pubs/27750