PROGRAM HTVOL: The Determination of Tree Crown Volume by Layers

Joseph C. Mawson; Jack Ward Thomas; Richard DeGraaf

Treesearch

PROGRAM HTVOL: The Determination of Tree Crown Volume by Layers

Informally Refereed

Authors:

Joseph C. Mawson, Jack Ward Thomas, Richard DeGraaf

Year:

1976

Type:

Research Paper

Station:

Northern Research Station

Source:

Res. Pap. NE-354. Upper Darby, PA: U.S. Department of Agriculture, Forest Service, Northeastern Forest Experiment Station. 9p.

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Download (PDF 662 KB): https://research.fs.usda.gov/download/treesearch/14463.pdf

Abstract

A 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.

Keywords

Crown Volume

Citation

Mawson, 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.