Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata

The accuracy of volumetric computation of small diameter logs based on mathematical formulae was evaluated. Plantation logs of 13-year-old Hopea odorata with diameter measurements of 20 to 30 cm were assessed using Huber’s, Smalian’s, Newton’s and truncated cone formulae. The reference volume of eac...

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Main Authors:	Mohd Jamil, A. W., Faridah, A. A., Nor Marzuina, F. K. N., Zafirah, Z. F.
Format:	Article
Language:	English
Published:	Forest Research Institute Malaysia 2019
Subjects:	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TS Manufactures
Online Access:	http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/1/Accuracy%20of%20conventional%20computations%20in%20assessing%20volume.pdf

id	ump-25607
recordtype	eprints
spelling	ump-256072019-11-20T08:49:07Z http://umpir.ump.edu.my/id/eprint/25607/ Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata Mohd Jamil, A. W. Faridah, A. A. Nor Marzuina, F. K. N. Zafirah, Z. F. TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TS Manufactures The accuracy of volumetric computation of small diameter logs based on mathematical formulae was evaluated. Plantation logs of 13-year-old Hopea odorata with diameter measurements of 20 to 30 cm were assessed using Huber’s, Smalian’s, Newton’s and truncated cone formulae. The reference volume of each log was determined using the fundamental method of water-displacement. Results of average values showed that all measurements were higher, compared to reference volume. Empirical evidence indicated that the truncated cone formula was the most precise measurement compared to other formulae. In the analyses of the separated sections, strong linear correlations between mathematical computations and reference volume were observed in middle logs. In contrast, evaluation of bottom and top logs showed lower r2 values. A correction factor was developed and proposed to estimate a more accurate volume of bottom logs. Based on standard geometrical profile of the logs, other plantation species fit for similar computation were suggested. Forest Research Institute Malaysia 2019-01-01 Article PeerReviewed pdf en http://umpir.ump.edu.my/id/eprint/25607/1/Accuracy%20of%20conventional%20computations%20in%20assessing%20volume.pdf Mohd Jamil, A. W. and Faridah, A. A. and Nor Marzuina, F. K. N. and Zafirah, Z. F. (2019) Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata. Journal of Tropical Forest Science, 31 (1). pp. 125-133. ISSN 0128-1283 https://doi.org/10.26525/jtfs2019.31.1.125133 https://doi.org/10.26525/jtfs2019.31.1.125133
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TS Manufactures
spellingShingle	TA Engineering (General). Civil engineering (General) TJ Mechanical engineering and machinery TS Manufactures Mohd Jamil, A. W. Faridah, A. A. Nor Marzuina, F. K. N. Zafirah, Z. F. Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
description	The accuracy of volumetric computation of small diameter logs based on mathematical formulae was evaluated. Plantation logs of 13-year-old Hopea odorata with diameter measurements of 20 to 30 cm were assessed using Huber’s, Smalian’s, Newton’s and truncated cone formulae. The reference volume of each log was determined using the fundamental method of water-displacement. Results of average values showed that all measurements were higher, compared to reference volume. Empirical evidence indicated that the truncated cone formula was the most precise measurement compared to other formulae. In the analyses of the separated sections, strong linear correlations between mathematical computations and reference volume were observed in middle logs. In contrast, evaluation of bottom and top logs showed lower r2 values. A correction factor was developed and proposed to estimate a more accurate volume of bottom logs. Based on standard geometrical profile of the logs, other plantation species fit for similar computation were suggested.
format	Article
author	Mohd Jamil, A. W. Faridah, A. A. Nor Marzuina, F. K. N. Zafirah, Z. F.
author_facet	Mohd Jamil, A. W. Faridah, A. A. Nor Marzuina, F. K. N. Zafirah, Z. F.
author_sort	Mohd Jamil, A. W.
title	Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
title_short	Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
title_full	Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
title_fullStr	Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
title_full_unstemmed	Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
title_sort	accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata
publisher	Forest Research Institute Malaysia
publishDate	2019
url	http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/ http://umpir.ump.edu.my/id/eprint/25607/1/Accuracy%20of%20conventional%20computations%20in%20assessing%20volume.pdf
first_indexed	2023-09-18T22:39:25Z
last_indexed	2023-09-18T22:39:25Z
_version_	1777416814171521024

Accuracy of conventional computations in assessing volume of small diameter logs of hopea odorata

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