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dc.contributor.authorCao, Biaoen_US
dc.contributor.authorGuo, Mingzhuen_US
dc.contributor.authorFan, Wenjieen_US
dc.contributor.authorXu, Xiruen_US
dc.contributor.authorPeng, Jingjingen_US
dc.contributor.authorRen, Huazhongen_US
dc.contributor.authorDu, Yongmingen_US
dc.contributor.authorLi, Huaen_US
dc.contributor.authorBian, Zunjianen_US
dc.contributor.authorHu, Tianen_US
dc.contributor.authorXiao, Qingen_US
dc.contributor.authorLiu, Qinhuoen_US
dc.date.accessioned2019-06-14T01:33:31Z
dc.date.available2019-06-14T01:33:31Z
dc.date.issued2018en_US
dc.identifier.issn0196-2892en_US
dc.identifier.doi10.1109/tgrs.2018.2845678en_US
dc.identifier.urihttp://hdl.handle.net/10072/385363
dc.description.abstractA new directional canopy emissivity model (CE-P) based on spectral invariants is proposed in this paper. First, we prove the existence of the spectral invariant properties in the thermal infrared (TIR) band using a Monte Carlo model. Based on it, the equation of the new model is derived from the perspective of absorption. In this expression, single-scattering and multiscattering effects are separated analytically in the TIR band. We find that the overall contribution of multiple scatterings is less than 0.005 when the component emissivities are over 0.90, and the overall contribution decreases with increasing leaf or soil emissivity. Furthermore, the new model can avoid the logical difficulty encountered when using the traditional cavity effect factor to simulate the emissivity of a sparse vegetation canopy. The results of 4SAIL and Discrete Anisotropic Radiative Transfer (DART) are selected to do cross validation. The CE-P can achieve a high accuracy compared with 4SAIL and DART, with an absolute bias less than 0.002 when the leaf (soil) emissivity is equal to 0.98 (0.94). Four widely used analytical models are selected for comparison. The resulting accuracies of these models are ordered from CE-P to REN15, FR97, FR02, and VALOR96 with the most serious error up to 0.002, 0.002, 0.007, 0.013, and 0.014, respectively. Three main conclusions are obtained through the sensitivity analysis: the multiscattering between vegetation and the background can be ignored when the leaf (soil) emissivity is no less than 0.94 (0.90), the second and higher order scattering within the vegetation can also be ignored when the leaf (soil) emissivity is no less than 0.94 (0.90), and the single-scattering effect within the canopy should be considered which can be calculated using three view factors.en_US
dc.description.peerreviewedYesen_US
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en_US
dc.relation.ispartofpagefrom6911en_US
dc.relation.ispartofpageto6926en_US
dc.relation.ispartofissue12en_US
dc.relation.ispartofjournalIEEE Transactions on Geoscience and Remote Sensingen_US
dc.relation.ispartofvolume56en_US
dc.subject.fieldofresearchGeophysicsen_US
dc.subject.fieldofresearchElectrical and Electronic Engineeringen_US
dc.subject.fieldofresearchGeomatic Engineeringen_US
dc.subject.fieldofresearchcode0404en_US
dc.subject.fieldofresearchcode0906en_US
dc.subject.fieldofresearchcode0909en_US
dc.titleA New Directional Canopy Emissivity Model Based on Spectral Invariantsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Articlesen_US
dc.type.codeC - Journal Articlesen_US
dc.description.versionPost-printen_US
gro.rights.copyright© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.en_US
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gro.griffith.authorHu, Tian


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