Year	2019
Authors	Tzeng Yih Lam,Lu M-K, Lam TY, Perng B-H, Lin H-T
Author Type	Corresponding Author,2
Paper Title	Close-range photogrammetry with spherical panoramas for mapping spatial location and measuring diameters of trees under forest canopies
Journal Title	Canadian Journal of Forest Research
Vol.No	49
Issue.No	8
Page(s)	865-874
Level Type	SCI
Total Pages	10
Date of Publication	2019-03-11
Abstract	Measurement of tree attributes is important to collect information for forest management. Close-range photogrammetry with spherical panoramas has seen very little development and applications compared to aerial photography. This study develops methods to extract azimuth, horizontal distance, diameter at breast height, and upper stem diameters of individual trees from spherical panoramas based on: (1) the trigonometry principle (TRIGO), (2) the TRIGO corrected for terrain slope (TRIGOSLP), and (3) the pinhole camera model (PINHOLE). Twenty three horizontal point sample plots were randomly established in plantations in Taiwan with a sample of 486 trees. Results showed that tree azimuth was accurately and precisely estimated. TRIGO performed the worst in accuracy and precision for all other tree attributes. TRIGOSLP improved the results of TRIGO but had large estimation errors. PINHOLE achieved the best overall precision for all other tree attributes, but was slightly inaccurate for estimating upper stem diameters. PINHOLE requires approaching a tree to attach a target of known size but has the ability to extract an almost continuous set of upper stem diameters from the tree, which could improve estimation of tree volume. Thus, PINHOLE could potentially be an alternative measurement system for hard-to-measure tree attributes.
Language	English
Reference URL	http://doi.org/10.1139/cjfr-2018-0430