scholarly journals Prediction of tree-size distributions and inventory variables from cumulants of canopy height distributions

2013 ◽  
Vol 86 (5) ◽  
pp. 583-595 ◽  
Author(s):  
S. Magnussen ◽  
E. Naesset ◽  
T. Gobakken
Keyword(s):  
Tree Size ◽  
Canopy Height ◽  
Size Distributions

Comparing individual tree detection and the area-based statistical approach for the retrieval of forest stand characteristics using airborne laser scanning in Scots pine stands

2011 ◽  
Vol 41 (3) ◽  
pp. 583-598 ◽  
Author(s):  
Jussi Peuhkurinen ◽  
Lauri Mehtätalo ◽  
Matti Maltamo
Keyword(s):  
Laser Scanning ◽  
Statistical Approach ◽  
Basal Area ◽  
Airborne Laser Scanning ◽  
Tree Size ◽  
Size Distributions ◽  
Individual Tree ◽  
Tree Detection ◽  
Airborne Laser ◽  
Number Of Stems

Airborne laser scanning based forest inventories employ two major methods: individual tree detection (ITD) and the area-based statistical approach (ABSA). ITD is based on the assumption that trees are of a certain form and can be delineated using airborne laser scanning techniques, whereas ABSA is an empirical method based on the relations between area-level forest attributes and laser echo height distributions. These two methods are compared here within the same test area in terms of their usefulness for estimating mean forest stand characteristics and tree size distributions. All evaluations were performed using leave-one-out cross validation. The average errors in volume and basal area did not differ significantly between the methods. ABSA resulted in overall better accuracies when estimating the diameter and height of the basal area median tree and the number of stems, whereas ITD produced significantly biased estimates for the number of stems and the mean tree size. Tree size distributions were estimated with slightly better accuracy using ABSA. More comprehensive investigations revealed that both methods were not able to estimate forest structure (tree size distribution and spatial distribution of tree locations), which in turn, affected the estimation accuracies.

Mortality and tree-size distributions in natural mixed-age forests

2007 ◽  
Vol 95 (1) ◽  
pp. 27-40 ◽  
Author(s):  
DAVID A. COOMES ◽  
ROBERT B. ALLEN
Keyword(s):  
Tree Size ◽  
Size Distributions ◽  
Mixed Age

scholarly journals On the Challenge of Fitting Tree Size Distributions in Ecology

PLoS ONE ◽  
2013 ◽  
Vol 8 (2) ◽  
pp. e58036 ◽  
Author(s):  
Franziska Taubert ◽  
Florian Hartig ◽  
Hans-Jürgen Dobner ◽  
Andreas Huth
Keyword(s):  
Tree Size ◽  
Size Distributions

Tree improvement effects on tree size distributions forPicea glaucaandPicea marianain New Brunswick, Canada

2009 ◽  
Vol 25 (1) ◽  
pp. 10-20 ◽  
Author(s):  
Yuhui Weng ◽  
Yillsung Park ◽  
Dale Simpson ◽  
Kathy Tosh ◽  
Michelle Fullarton
Keyword(s):  
New Brunswick ◽  
Tree Improvement ◽  
Tree Size ◽  
Size Distributions
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