Calibrating the severity of forest defoliation by pine processionary moth with landsat and UAV imagery
Otsu, Kaori (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Pla, Magda (InForest JRU)
Vayreda Duran, Jordi (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Brotons, Lluís (Centre de Recerca Ecològica i d'Aplicacions Forestals)

Date:	2018
Abstract:	The pine processionary moth (Thaumetopoea pityocampa Dennis and Schiff. ), one of the major defoliating insects in Mediterranean forests, has become an increasing threat to the forest health of the region over the past two decades. After a recent outbreak of T. pityocampa in Catalonia, Spain, we attempted to estimate the damage severity by capturing the maximum defoliation period over winter between pre-outbreak and post-outbreak images. The difference in vegetation index (dVI) derived from Landsat 8 was used as the change detection indicator and was further calibrated with Unmanned Aerial Vehicle (UAV) imagery. Regression models between predicted dVIs and observed defoliation degrees by UAV were compared among five selected dVIs for the coefficient of determination. Our results found the highest R-squared value (0. 815) using Moisture Stress Index (MSI), with an overall accuracy of 72%, as a promising approach for estimating the severity of defoliation in affected areas where ground-truth data is limited. We concluded with the high potential of using UAVs as an alternative method to obtain ground-truth data for cost-effectively monitoring forest health. In future studies, combining UAV images with satellite data may be considered to validate model predictions of the forest condition for developing ecosystem service tools.
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Forest defoliation ; Thaumetopoea pityocampa ; Vegetation index ; Unmanned aerial vehicle (UAV) ; Change detection
Published in:	Sensors (Basel, Switzerland), Vol. 18, Núm. 10 (September 2018) , art. 3278, ISSN 1424-8220

DOI: 10.3390/s18103278
PMID: 30274284

14 p, 3.3 MB

The record appears in these collections:
Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > CREAF (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Articles > Research articles
Articles > Published articles