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metadata.revistascielo.dc.title: Individual tree identification in airborne laser data by inverse search window
metadata.revistascielo.dc.creator: Gorgens, Eric Bastos
Rodriguez, Luiz Carlos Estraviz
Silva, André Gracioso Peres da
Silva, Carlos Alberto
metadata.revistascielo.dc.subject: LiDAR
Local maximum
Canopy height model
metadata.revistascielo.dc.publisher: Editora da Universidade Federal de Lavras 7-Apr-2016
metadata.revistascielo.dc.identifier.citation: GORGENS, E. B. et al. Individual tree identification in airborne laser data by inverse search window. Cerne, Lavras, v. 21, n. 1, 2015.
metadata.revistascielo.dc.description.resumo: The local maximum filtering performance is highly dependent of the window size definition. This paper proposes that the window size should be determined by an inverse relationship to the canopy height model, and test the hypothesis that a windowsize inversely proportional will have better performance than the window proportional to the canopy height model. The study area is located in the southeastern region of the State of British Columbia, Canada. The natural vegetation is the boreal type and is characterized by the dominance of two species Picea engelmannii Parry ex. Engelmann (Engelmann spruce) and Abies lasiocarpa (Hook.) Nutt. (sub-alpine fir). The relief is mountainous with altitudes ranging from 650-2400 meters. 62 plots with 256 square meters were measured in the field. The airborne LiDAR had discrete returns, 2 points per square meter density and small-footprint. The performance of the search windows was evaluated based on success percentage, absolute average error and also compared to the observed values of the field plots. The local maximum filter underestimated the number of trees per hectare for both window sizing methods. The use of the inverse proportional window size has resulted in superior results, particularly for regions with highest density of trees.
metadata.revistascielo.dc.language: eng
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