Can Leaf Water Content Be Estimated Using Multispectral Terrestrial Laser Scanning? A Case Study With Norway Spruce Seedlings

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Can Leaf Water Content Be Estimated Using Multispectral Terrestrial Laser Scanning? A Case Study With Norway Spruce Seedlings. / Junttila, Samuli; Sugano, Junko; Vastaranta, Mikko; Linnakoski, Riikka; Kaartinen, Harri; Kukko, Antero; Holopainen, Markus; Hyyppä, Hannu; Hyyppä, Juha.

julkaisussa: FRONTIERS IN PLANT SCIENCE, Vuosikerta 9, 299, 08.03.2018.

Tutkimustuotos: Lehtiartikkelivertaisarvioitu

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@article{900e88c950324be9b57f2db993aad6d6,
title = "Can Leaf Water Content Be Estimated Using Multispectral Terrestrial Laser Scanning? A Case Study With Norway Spruce Seedlings",
abstract = "Changing climate is increasing the amount and intensity of forest stress agents, such as drought, pest insects, and pathogens. Leaf water content, measured here in terms of equivalent water thickness (EWT), is an early indicator of tree stress that provides timely information about the health status of forests. Multispectral terrestrial laser scanning (MS-TLS) measures target geometry and reflectance simultaneously, providing spatially explicit reflectance information at several wavelengths. EWT and leaf internal structure affect leaf reflectance in the shortwave infrared region that can be used to predict EWT with MS-TLS. A second wavelength that is sensitive to leaf internal structure but not affected by EWT can be used to normalize leaf internal effects on the shortwave infrared region and improve the prediction of EWT. Here we investigated the relationship between EWT and laser intensity features using multisensor MS-TLS at 690, 905, and 1,550 nm wavelengths with both drought-treated and Endoconidiophora polonica inoculated Norway spruce seedlings to better understand how MS-TLS measurements can explain variation in EWT. In our study, a normalized ratio of two wavelengths at 905 and 1,550 nm and length of seedling explained 91{\%} of the variation (R-2) in EWT as the respective prediction accuracy for EWT was 0.003 g/cm(2) in greenhouse conditions. The relation between EWT and the normalized ratio of 905 and 1,550 nm wavelengths did not seem sensitive to a decreased point density of the MS-TLS data. Based on our results, different EWTs in Norway spruce seedlings show different spectral responses when measured using MS-TLS. These results can be further used when developing EWT monitoring for improving forest health assessments.",
keywords = "terrestrial laser scanning, tree health, drought stress, multispectral laser scanning, leaf water content, forest damage, Endoconidiophora polonica, INDUCED TREE MORTALITY, FUEL MOISTURE-CONTENT, RED-ATTACK DAMAGE, LIDAR DATA, SURFACE-TEMPERATURE, FOREST HEALTH, PLANT STRESS, VEGETATION, REFLECTANCE, INTENSITY",
author = "Samuli Junttila and Junko Sugano and Mikko Vastaranta and Riikka Linnakoski and Harri Kaartinen and Antero Kukko and Markus Holopainen and Hannu Hyypp{\"a} and Juha Hyypp{\"a}",
year = "2018",
month = "3",
day = "8",
doi = "10.3389/fpls.2018.00299",
language = "English",
volume = "9",
journal = "FRONTIERS IN PLANT SCIENCE",
issn = "1664-462X",
publisher = "Frontiers Research Foundation",

}

RIS - Lataa

TY - JOUR

T1 - Can Leaf Water Content Be Estimated Using Multispectral Terrestrial Laser Scanning? A Case Study With Norway Spruce Seedlings

AU - Junttila, Samuli

AU - Sugano, Junko

AU - Vastaranta, Mikko

AU - Linnakoski, Riikka

AU - Kaartinen, Harri

AU - Kukko, Antero

AU - Holopainen, Markus

AU - Hyyppä, Hannu

AU - Hyyppä, Juha

PY - 2018/3/8

Y1 - 2018/3/8

N2 - Changing climate is increasing the amount and intensity of forest stress agents, such as drought, pest insects, and pathogens. Leaf water content, measured here in terms of equivalent water thickness (EWT), is an early indicator of tree stress that provides timely information about the health status of forests. Multispectral terrestrial laser scanning (MS-TLS) measures target geometry and reflectance simultaneously, providing spatially explicit reflectance information at several wavelengths. EWT and leaf internal structure affect leaf reflectance in the shortwave infrared region that can be used to predict EWT with MS-TLS. A second wavelength that is sensitive to leaf internal structure but not affected by EWT can be used to normalize leaf internal effects on the shortwave infrared region and improve the prediction of EWT. Here we investigated the relationship between EWT and laser intensity features using multisensor MS-TLS at 690, 905, and 1,550 nm wavelengths with both drought-treated and Endoconidiophora polonica inoculated Norway spruce seedlings to better understand how MS-TLS measurements can explain variation in EWT. In our study, a normalized ratio of two wavelengths at 905 and 1,550 nm and length of seedling explained 91% of the variation (R-2) in EWT as the respective prediction accuracy for EWT was 0.003 g/cm(2) in greenhouse conditions. The relation between EWT and the normalized ratio of 905 and 1,550 nm wavelengths did not seem sensitive to a decreased point density of the MS-TLS data. Based on our results, different EWTs in Norway spruce seedlings show different spectral responses when measured using MS-TLS. These results can be further used when developing EWT monitoring for improving forest health assessments.

AB - Changing climate is increasing the amount and intensity of forest stress agents, such as drought, pest insects, and pathogens. Leaf water content, measured here in terms of equivalent water thickness (EWT), is an early indicator of tree stress that provides timely information about the health status of forests. Multispectral terrestrial laser scanning (MS-TLS) measures target geometry and reflectance simultaneously, providing spatially explicit reflectance information at several wavelengths. EWT and leaf internal structure affect leaf reflectance in the shortwave infrared region that can be used to predict EWT with MS-TLS. A second wavelength that is sensitive to leaf internal structure but not affected by EWT can be used to normalize leaf internal effects on the shortwave infrared region and improve the prediction of EWT. Here we investigated the relationship between EWT and laser intensity features using multisensor MS-TLS at 690, 905, and 1,550 nm wavelengths with both drought-treated and Endoconidiophora polonica inoculated Norway spruce seedlings to better understand how MS-TLS measurements can explain variation in EWT. In our study, a normalized ratio of two wavelengths at 905 and 1,550 nm and length of seedling explained 91% of the variation (R-2) in EWT as the respective prediction accuracy for EWT was 0.003 g/cm(2) in greenhouse conditions. The relation between EWT and the normalized ratio of 905 and 1,550 nm wavelengths did not seem sensitive to a decreased point density of the MS-TLS data. Based on our results, different EWTs in Norway spruce seedlings show different spectral responses when measured using MS-TLS. These results can be further used when developing EWT monitoring for improving forest health assessments.

KW - terrestrial laser scanning

KW - tree health

KW - drought stress

KW - multispectral laser scanning

KW - leaf water content

KW - forest damage

KW - Endoconidiophora polonica

KW - INDUCED TREE MORTALITY

KW - FUEL MOISTURE-CONTENT

KW - RED-ATTACK DAMAGE

KW - LIDAR DATA

KW - SURFACE-TEMPERATURE

KW - FOREST HEALTH

KW - PLANT STRESS

KW - VEGETATION

KW - REFLECTANCE

KW - INTENSITY

UR - http://www.scopus.com/inward/record.url?scp=85045447312&partnerID=8YFLogxK

U2 - 10.3389/fpls.2018.00299

DO - 10.3389/fpls.2018.00299

M3 - Article

VL - 9

JO - FRONTIERS IN PLANT SCIENCE

JF - FRONTIERS IN PLANT SCIENCE

SN - 1664-462X

M1 - 299

ER -

ID: 18549382