Fully Automated Gis-Based Individual Tree Crown Delineation Based on Curvature Values From a Lidar Derived Canopy Height Model in a Coniferous Plantation

Abstract

ABSTRACT:The generation of high resolution canopy height model (CHM) from LiDAR makes it possible to delineate individual tree crown by means of a fully-automated method using the CHM's curvature through its slope. The local maxima are obtained by taking the maximum raster value in a 3 m x 3 m cell. These values are assumed as tree tops and therefore considered as individual trees. Based on the assumptions, thiessen polygons were generated to serve as buffers for the canopy extent. The negative profile curvature is then measured from the slope of the CHM. The results show that the aggregated points from a negative profile curvature raster provide the most realistic crown shape. The absence of field data regarding tree crown dimensions require accurate visual assessment after the appended delineated tree crown polygon was superimposed to the hill shaded CHM.

Scale dependent spatial structuring of mountain river large bed elements maximizes flow resistance

“…Approaches for LBE extraction tested in this study were informed by methods for mapping tree-crowns from remotely-sensed imagery and/or topographic data. Tree-crown mapping methods can be broadly classified into those that apply mathematical morphology (Andersen et al, 2001;Koukoulas and Blackburn, 2005), object-based image analysis (Sullivan et al, 2009;Jakubowski et al, 2013), edge-detection, local-maxima filtering and detection Argamosa et al, 2016), clustering (Culvenor, 2002;Morsdorf et al, 2004), valley-following (Leckie et al, 2003), region-growing (Barnes et al, 2017;Dalponte et al, 2019), watershed segmentation Koch et al, 2006;Kwak et al, 2007), and graph based (Strîmbu and Strîmbu, 2015) approaches. Nearly all approaches use a canopy height model (CHM) as a starting point.…”

Mapping Potential Areas for Conservation Under Forest Carbon Credit Eligibility in a Natural Protected Area in Northern Mexico

“…The Thiessen polygon approach was used in the forest sector to analyze variables strongly linked to spatial features of a forest such as stand age, land tenure, and physiognomic characteristics of trees, i.e. , tree crown height (Argamosa et al, 2016; Butler et al, 2014; Nelson et al, 2004).…”

Identification of the Forest Cover Growth on Landscape Level from Aerial Laser Scanning Data

“…This non-trivial procedure also conditioned the assessment of the degree of density of the tree canopy, or the coverage of the growth area with their crowns. The methodology published by [35] was used to identify tree crowns. Based on this methodology, the first step was finding the treetops.…”