Skip to Main Content
Due to a lapse in federal funding, this USDA website will not be actively updated. Once funding has been reestablished, online operations will continue.
PROGRAM HTVOL: The Determination of Tree Crown Volume by LayersAuthor(s): Joseph C. Mawson; Jack Ward Thomas; Richard M. DeGraaf
Source: Res. Pap. NE-354. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9p.
Publication Series: Research Paper (RP)
Station: Northeastern Research Station
PDF: View PDF (582.82 KB)
DescriptionA FORTRAN IV computer program calculates, from a few field measurements, the volume of tree crowns. This volume is in layers of a specified thickness of trees or large shrubs. Each tree is assigned one of 15 solid forms, formed by using one of five side shapes (a circle, an ellipse, a neiloid, a triangle, or a parabolalike shape), and one of three bottom shapes (a circle, an ellipse, or a triangle). A test of the accuracy of this technique shows that it produces estimates within acceptable limits of error if the shape is carefully selected. The program sorts these volume data by layer within species for each sample plot. Any number of plots can be run at one pass through the computer, and up to 100 species can be designated.
- Check the Northern Research Station web site to request a printed copy of this publication.
- Our on-line publications are scanned and captured using Adobe Acrobat.
- During the capture process some typographical errors may occur.
- Please contact Sharon Hobrla, email@example.com if you notice any errors which make this publication unusable.
- 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.
CitationMawson, Joseph C.; Thomas, Jack Ward; DeGraaf, Richard M. 1976. PROGRAM HTVOL: The Determination of Tree Crown Volume by Layers. Res. Pap. NE-354. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9p.
- Using satellite and airborne LiDAR to model woodpecker habitat occupancy at the landscape scale
- Gap characteristics of southeastern Ohio second-growth forests
- Vegetative and adaptive traits predict different outcomes for restoration using hybrids
XML: View XML