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Im, Jungho
Intelligent Remote sensing and geospatial Information Science Lab.
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dc.citation.startPage 108655 -
dc.citation.title FIELD CROPS RESEARCH -
dc.citation.volume 287 -
dc.contributor.author Xu, Jin -
dc.contributor.author Quackenbush, Lindi J. -
dc.contributor.author Volk, Timothy A. -
dc.contributor.author Im, Jungho -
dc.date.accessioned 2023-12-21T13:37:24Z -
dc.date.available 2023-12-21T13:37:24Z -
dc.date.created 2022-11-07 -
dc.date.issued 2022-10 -
dc.description.abstract Shrub willow can be used as a perennial energy crop to produce biomass for biofuels, bioproducts, and bioenergy to help address environmental issues. Leaf chlorophyll content (LCC), leaf area index (LAI), and canopy chlo-rophyll content (CCC), which are closely related to vegetation health status, provide valuable information to assess willow vigor and crop management activities. We developed models for estimating LCC, LAI, and CCC from Sentinel-2 and unmanned aerial system (UAS) data using a number of vegetation indices (VIs) and applying four analytical tools: regression analysis, partial least squares regression (PLSR), random forest (RF), and neural networks (NNs). We investigated twenty VIs using regression analysis, finding the red-edge normalized differ-ence vegetation index (NDVIre) as the optimal VI based on predictive performance and so this was included as an input variable for the PLSR, RF, and NN methods. For RF and NN models, sensitivity analysis was implemented to help tune hyperparameters and provide information to guide future studies. Results showed that the best averaged performance of Sentinel-2 and UAS data for LCC, LAI, and CCC (normalized root mean square error (NRMSE) = 9%, 12%, and 10%) of the same site in the same year was derived from models based on the NN algorithm using blue (B), green (G), red (R), red-edge (RE), and near-infrared (NIR) bands. In order to test model transferability, we collected UAS and Sentinel-2 data across different years and sites. Based on NRMSE, NN models using B, G, R, RE, and NIR bands provided the best averaged predictive performance for LCC estimation (16%) and the regression modeling using NDVIre performed best for LAI (21%) and CCC (13%) estimation for both Sentinel-2 and UAS data. Moreover, CCC estimation had smaller NRMSE values than LCC and LAI esti-mation for both Sentinel-2 and UAS data. Based on this study, we found that UAS data has the potential to complement Sentinel-2 data by mitigating limitations caused by temporal resolution and cloud cover. We also recommend use of the CCC parameter to evaluate shrub willow health status and perform time-series monitoring across time and space. -
dc.identifier.bibliographicCitation FIELD CROPS RESEARCH, v.287, pp.108655 -
dc.identifier.doi 10.1016/j.fcr.2022.108655 -
dc.identifier.issn 0378-4290 -
dc.identifier.scopusid 2-s2.0-85135980445 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/60015 -
dc.identifier.wosid 000863318100004 -
dc.language 영어 -
dc.publisher ELSEVIER -
dc.title Estimation of shrub willow biophysical parameters across time and space from Sentinel-2 and unmanned aerial system (UAS) data -
dc.type Article -
dc.description.isOpenAccess FALSE -
dc.relation.journalWebOfScienceCategory Agronomy -
dc.relation.journalResearchArea Agriculture -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor Chlorophyll content -
dc.subject.keywordAuthor Leaf area index -
dc.subject.keywordAuthor Vegetation index -
dc.subject.keywordAuthor Red-edge band -
dc.subject.keywordAuthor Regression -
dc.subject.keywordAuthor Machine learning -
dc.subject.keywordPlus LEAF-AREA INDEX -
dc.subject.keywordPlus CONVOLUTIONAL NEURAL-NETWORKS -
dc.subject.keywordPlus VEGETATION INDEXES -
dc.subject.keywordPlus CHLOROPHYLL CONTENT -
dc.subject.keywordPlus GREEN LAI -
dc.subject.keywordPlus CROSS-VALIDATION -
dc.subject.keywordPlus UNITED-STATES -
dc.subject.keywordPlus BIOMASS CROPS -
dc.subject.keywordPlus FOREST -
dc.subject.keywordPlus RED -

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