Measuring Leaf Water Content with Dual-Wavelength Intensity Data from Terrestrial Laser Scanners

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Junttila, Samuli Vastaranta, Mikko Liang, Xinlian Kaartinen, Harri Kukko, Antero Kaasalainen, Sanna Holopainen, Markus Hyyppä, Hannu Hyyppä, Juha 2017-01-19T11:01:21Z 2017
dc.identifier.citation Junttila , S , Vastaranta , M , Liang , X , Kaartinen , H , Kukko , A , Kaasalainen , S , Holopainen , M , Hyyppä , H & Hyyppä , J 2016 , ' Measuring Leaf Water Content with Dual-Wavelength Intensity Data from Terrestrial Laser Scanners ' REMOTE SENSING , vol 9 , no. 1 , 8 . DOI: 10.3390/rs9010008 en
dc.identifier.issn 2072-4292
dc.identifier.other PURE UUID: 315a2cb1-3c48-438b-9410-f4f661e5b79b
dc.identifier.other PURE ITEMURL:
dc.identifier.other PURE FILEURL:
dc.description.abstract Decreased leaf moisture content, typically measured as equivalent water thickness (EWT), is an early signal of tree stress caused by drought, disease, or pest insects. We investigated the use of two terrestrial laser scanners (TLSs) employing different wavelengths for improving the understanding how EWT can be retrieved in a laboratory setting. Two wavelengths were examined for normalizing the effects of varying leaf structure and geometry on the measured intensity. The relationship between laser intensity features, using red (690 nm) and shortwave infrared (1550 nm) wavelengths, and the EWT of individual leaves or groups of needles were determined with and without intensity corrections. To account for wrinkles and curvatures of the leaves and needles, a model describing the relationship between incidence angle and backscattered intensity was applied. Additionally, a reflectance model describing both diffuse and specular reflectance was employed to remove the fraction of specular reflectance from backscattered intensity. A strong correlation (R2 = 0.93, RMSE = 0.004 g/cm2) was found between a normalized ratio of the two wavelengths and the measured EWT of samples. The applied intensity correction methods did not significantly improve the results of the study. The backscattered intensity responded to changes in EWT but more investigations are needed to test the suitability of TLSs to retrieve EWT in a forest environment. en
dc.format.extent 20
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries REMOTE SENSING en
dc.relation.ispartofseries Volume 9, issue 1 en
dc.rights openAccess en
dc.subject.other 4112 Forestry en
dc.subject.other global climate change en
dc.title Measuring Leaf Water Content with Dual-Wavelength Intensity Data from Terrestrial Laser Scanners en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Helsinki
dc.contributor.department Finnish Geospatial Research Institute
dc.contributor.department Department of Built Environment
dc.subject.keyword forest health
dc.subject.keyword forestry
dc.subject.keyword terrestrial laser scanning
dc.subject.keyword lidar
dc.subject.keyword multispectral lidar
dc.subject.keyword leaf water content
dc.subject.keyword monitoring
dc.subject.keyword time series
dc.subject.keyword 4112 Forestry
dc.subject.keyword global climate change
dc.identifier.urn URN:NBN:fi:aalto-201701191129
dc.identifier.doi 10.3390/rs9010008

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