Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (119 KB bytes)

Title: Simple, Flexible, Trigonometric Taper Equations

Author: Thomas, Charles E.; Parresol, Bernard R.;

Date: 1991

Source: Can. J. For. Res. 21: 1132-1137

Publication Series: Miscellaneous Publication

Description: There have been numerous approaches to modeling stem form in recent decades. The majority have concentrated on the simpler coniferous bole form and have become increasingly complex mathematical expressions. Use of trigonometric equations provides a simple expression of taper that is flexible enough to fit both coniferous and hard-wood bole forms. As an illustration, we applied trigonometric taper equations to examples from thinned and unthinned slash pine (Pinus elliottii Engelm. var. elliottii), willow oak (Quercus phellos L.), and sweet gum (Liquidambar styraciflua L.). Comparison of new trigonometric models with a segmented-polynomial approach developed in 1976 indicates that equations based on trigonometric functions perform equally well and have real advantages in terms of parsimony.

Publication Notes:

  • 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.
  • 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.)

XML: View XML

Citation:


Thomas, Charles E.; Parresol, Bernard R. 1991. Simple, Flexible, Trigonometric Taper Equations. Can. J. For. Res. 21: 1132-1137

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.