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Authordc.contributor.authorFassnacht, Fabian Ewald
Authordc.contributor.authorSchmidt-Riese, Ephraim
Authordc.contributor.authorKattenborn, Teja
Authordc.contributor.authorHernández Palma, Héctor Jaime
Cita de ítemdc.identifier.citationInternational Journal of Applied Earth Observations and Geoinformation 95 (2021) 102262es_ES
Abstractdc.description.abstractCharacterizing the spatial variability of the severity of wildfires is important to assess ecological and economic consequences and to coordinate mitigation strategies. Vegetation indices such as the differenced Normalized Burn Ratio (dNBR) have become a standard tool to assess burn or fire severity across larger areas and are being used operationally. Despite the frequent application of dNBR-like vegetation indices, it is not yet fully understood which variables exactly drive the variability in dNBR observed by multispectral satellites. One reason for this is the lack of high quality prefire information about vegetation structure and composition. Consequently, the influence of prefire vegetation composition and other potentially influential variables such as cast shadows has hardly been examined. Here, we use very high resolution Unmanned Aerial System (UAS) orthoimages collected briefly before and after the large wildfires in Central Chile in the fire season 2016/2017 to derive variables related to the pre- and postfire landscape composition and structure. The variables are used as predictors in Generalized Additive Models (GAM) to explain the spatial variability in dNBR and RdNBR pixel values as observed by Sentinel-2. Our models explain more than 80% and 75% of the variability in dNBR and RdNBR values, respectively, using a sparse set of five predictors. The results suggest that in our study area the largest fraction of variability in Sentinel-2 based dNBR and RdNBR values can be explained by variables related to the fraction of consumed canopy cover while the vegetation composition before the fire does not have a large influence on dNBR and RdNBR. Our results further suggest that cast-shadows of snags and standing dead trees with remaining crown structure have a notable influence on the dNBR signal which may have been underestimated so far. We conclude that spatially continuous, very high spatial resolution data from UAS can be a valuable data source for an improved understanding of the exact meaning of common vegetation index products, operationally used for monitoring the environment.es_ES
Patrocinadordc.description.sponsorshipGerman National Space Agency DLR (Deutsches Zentrum fur Luft-und Raumfahrt e.V.) on behalf of German Federal Ministry of Economy and Technology 50EE1535 50EE1536 KIT-Publication Fund of Karlsruhe Institute of Technologyes_ES
Type of licensedc.rightsAttribution-NonCommercial-NoDerivs 3.0 United States*
Link to Licensedc.rights.uri*
Sourcedc.sourceInternational Journal of Applied Earth Observations and Geoinformationes_ES
Keywordsdc.subjectdNBR variabilityes_ES
Títulodc.titleExplaining sentinel 2-based dNBR and RdNBR variability with reference data from the bird’s eye (UAS) perspectivees_ES
Document typedc.typeArtículo de revistaes_ES
dc.description.versiondc.description.versionVersión publicada - versión final del editores_ES
dcterms.accessRightsdcterms.accessRightsAcceso abiertoes_ES
Indexationuchile.indexArtículo de publícación WoSes_ES

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Attribution-NonCommercial-NoDerivs 3.0 United States
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 United States