Estimating crown variables of individual trees using airborne and terrestrial laser scanners

Sung Eun Jung, Doo Ahn Kwak, Taejin Park, Woo Kyun Lee, Seongjin Yoo

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

In this study, individual tree height (TH), crown base height (CBH), crown area (CA) and crown volume (CV), which were considered as essential parameters for individual stem volume and biomass estimation, were estimated by both an airborne laser scanner (ALS) and a terrestrial laser scanner (TLS). These ALS- and TLS-derived tree parameters were compared because TLS has been introduced as an instrument to measure objects more precisely. ALS-estimated TH was extracted from the highest value within a crown boundary delineated with the crown height model (CHM). The ALS-derived CBH of individual trees was estimated by k-means clustering method using the ALS data within the boundary. The ALS-derived CA was calculated simply with the crown boundary, after which CV was computed automatically using the crown geometric volume (CGV). On the other hand, all TLS-derived parameters were detected manually and precisely except the TLS-derived CGV. As a result, the ALS-extracted TH, CA, and CGV values were underestimated whereas CBH was overestimated when compared with the TLS-derived parameters. The coefficients of determination (R 2) from the regression analysis between the ALS and TLS estimations were approximately 0.94, 0.75, 0.69 and 0.58, and root mean square errors (RMSEs) were approximately 0.0184 m, 0.4929 m, 2.3216 m 2 and 13.2087 m 3 for TH, CBH, CA and CGV, respectively. Thereby, the error rate decreased to 0.0089, 0.0727 and 0.0875 for TH, CA and CGV via the combination of ALS and TLS data.

Original languageEnglish
Pages (from-to)2346-2363
Number of pages18
JournalRemote Sensing
Volume3
Issue number11
DOIs
Publication statusPublished - 2011 Nov 1

Keywords

  • Airborne laser scanner
  • Crown geometric volume
  • Digital canopy model
  • K-means clustering
  • Terrestrial laser scanner

ASJC Scopus subject areas

  • Earth and Planetary Sciences(all)

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