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作者

来源

URBAN FORESTRY & URBAN GREENING,Vol.35,P.66-71

语言

英文

关键字

Photogrammetry; Point cloud; Remote sensing, individual tree level; Right-of-way; SfM; Street tree inventory; Urban; HAND-HELD CAMERA; URBAN; POLLUTION; ACCURACY; VIEW

作者单位

[Roberts, John W.; Koeser, Andrew K.] Univ Florida, Gulf Coast Res & Educ Ctr, Dept Environm Hort, CLCE,IFAS, 14625 Cty Rd 672, Wimauma, FL 33598 USA. [Abd-Elrahman, Amr H.] Univ Florida, Gulf Coast Res & Educ Ctr, Sch Forest Resources & Conservat Geomat, IFAS, 1200 North Pk Rd, Plant City, FL 33563 USA. [Hansen, Gail] Univ Florida, Dept Environm Hort, CLCE, IFAS, POB 110670, Gainesville, FL 32611 USA. [Landry, Shawn M.] Univ S Florida, Sch Geosci, 4202 East Fowler Ave, Tampa, FL 33620 USA. [Wilkinson, Benjamin E.] Univ Florida, IFAS, Sch Forest Resources & Conservat, POB 110565, Gainesville, FL 32611 USA. Roberts, JW (reprint author), Univ Florida, Gulf Coast Res & Educ Ctr, Dept Environm Hort, CLCE,IFAS, 14625 Cty Rd 672, Wimauma, FL 33598 USA. E-Mail: jwr.09@ufl.edu

摘要

Much of forest science is dependent on accurate stem measurements, and relatively new photogrammetric techniques may be suitable for modeling stems from the terrestrial perspective. From imagery taken along a windbreak and urban roadways we tested the viability of photogrammetric modeling for producing accurate diameter at breast height measurements. Treatments for different point cloud models differed based on intervals between control points (i.e., every 5 m, 10 m, 25 m, and an absence of target control points) and site conditions (i.e., urban mixed species vs. a windbreak of Pinus taeda) over 100m sections in the Tampa Bay, FL area. Stem diameter measurements from both the windbreak (n = 53) and the urban sites (n= 93) showed high conformity between field-derived and point cloud model measurements (linear regression showed R-2 values > 0.9 and RMSE values ranging from 7.04 - 12.35%) with the number of control point targets having little influence on modeled DBH accuracy. Modeled stems of larger trees had greater associated error relative to DBH tape measurements, which can be attributed, in part, to problems with estimating diameter from non-circular stems of certain urban species (i.e., Quercus virginiana). Future work will focus on georeferencing these datasets and extracting data on other aspects of stem biometry (e.g., lean angle of stem, stem volume, etc.).