Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density

Leaf area is a key structural characteristic of forest canopies because of the role of leaves in controlling many biological and physical processes occurring at the biosphere-atmosphere transition. High pulse density Airborne Laser Scanning (ALS) holds promise to provide spatially resolved and accur...

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Autores principales:	Maurent, Eliott, y siete autores más
Formato:	Artículo
Lenguaje:	Inglés
Publicado:	Elsevier 2023
Materias:	BOSQUES FORESTS AIRBORNE LASER SCANNING ESCANEO LÁSER AEROTRANSPORTADO ALS PLANT AREA DENSITY DENSIDAD DEL ÁREA DE LA PLANTA PAD LAD Oficina Nacional Guatemala
Acceso en línea:	https://repositorio.catie.ac.cr/handle/11554/12229

id	RepoCATIE12229
record_format	dspace
spelling	RepoCATIE122292023-01-19T16:18:06Z Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density Maurent, Eliott y siete autores más BOSQUES FORESTS AIRBORNE LASER SCANNING ESCANEO LÁSER AEROTRANSPORTADO ALS PLANT AREA DENSITY DENSIDAD DEL ÁREA DE LA PLANTA PAD LAD Oficina Nacional Guatemala Leaf area is a key structural characteristic of forest canopies because of the role of leaves in controlling many biological and physical processes occurring at the biosphere-atmosphere transition. High pulse density Airborne Laser Scanning (ALS) holds promise to provide spatially resolved and accurate estimates of plant area density (PAD) in forested landscapes, a key step in understanding forest functioning: phenology, carbon uptake, transpiration, radiative balance etc. Inconsistencies between different ALS sensors is a barrier to generating globally harmonised PAD estimates. The basic assumption on which PAD estimation is based is that light attenuation is proportional to vegetation area density. This study shows that the recorded extinction strongly depends on target detectability which is influenced by laser characteristics (power, sensitivity, wavelength). Three different airborne laser scanners were flown over a wet tropical forest at the Paracou research station in French Guiana. Different sensors, flight heights and transmitted power levels were compared. Light attenuation was retrieved with an open source ray-tracing code (http://amapvox.org). Direct comparison revealed marked differences (up-to 25% difference in profile-averaged light attenuation rate and 50% difference at particular heights) that could only be explained by differences in scanner characteristics. We show how bias which may occur under various acquisition conditions can generally be mitigated by a sensor intercalibration. Alignment of light weight lidar attenuation profiles to ALS reference attenuation profiles is not always satisfactory and we discuss what are the likely sources of discrepancies. Neglecting the dependency of apparent light attenuation on scanner properties may lead to biases in estimated vegetation density commensurate to those affecting light attenuation estimates. Applying intercalibration procedures supports estimation of plant area density independent of acquisition characteristics. 2023-01-18T20:43:51Z 2023-01-18T20:43:51Z 2023-03 Artículo https://repositorio.catie.ac.cr/handle/11554/12229 restrictedAccess en Remote Sensing of Environment https://doi.org/10.1016/j.rse.2022.113442 14 páginas application/pdf Elsevier
institution	Centro Agronómico Tropical de Investigación y Enseñanza
collection	Repositorio CATIE
language	Inglés
topic	BOSQUES FORESTS AIRBORNE LASER SCANNING ESCANEO LÁSER AEROTRANSPORTADO ALS PLANT AREA DENSITY DENSIDAD DEL ÁREA DE LA PLANTA PAD LAD Oficina Nacional Guatemala
spellingShingle	BOSQUES FORESTS AIRBORNE LASER SCANNING ESCANEO LÁSER AEROTRANSPORTADO ALS PLANT AREA DENSITY DENSIDAD DEL ÁREA DE LA PLANTA PAD LAD Oficina Nacional Guatemala Maurent, Eliott y siete autores más Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
description	Leaf area is a key structural characteristic of forest canopies because of the role of leaves in controlling many biological and physical processes occurring at the biosphere-atmosphere transition. High pulse density Airborne Laser Scanning (ALS) holds promise to provide spatially resolved and accurate estimates of plant area density (PAD) in forested landscapes, a key step in understanding forest functioning: phenology, carbon uptake, transpiration, radiative balance etc. Inconsistencies between different ALS sensors is a barrier to generating globally harmonised PAD estimates. The basic assumption on which PAD estimation is based is that light attenuation is proportional to vegetation area density. This study shows that the recorded extinction strongly depends on target detectability which is influenced by laser characteristics (power, sensitivity, wavelength). Three different airborne laser scanners were flown over a wet tropical forest at the Paracou research station in French Guiana. Different sensors, flight heights and transmitted power levels were compared. Light attenuation was retrieved with an open source ray-tracing code (http://amapvox.org). Direct comparison revealed marked differences (up-to 25% difference in profile-averaged light attenuation rate and 50% difference at particular heights) that could only be explained by differences in scanner characteristics. We show how bias which may occur under various acquisition conditions can generally be mitigated by a sensor intercalibration. Alignment of light weight lidar attenuation profiles to ALS reference attenuation profiles is not always satisfactory and we discuss what are the likely sources of discrepancies. Neglecting the dependency of apparent light attenuation on scanner properties may lead to biases in estimated vegetation density commensurate to those affecting light attenuation estimates. Applying intercalibration procedures supports estimation of plant area density independent of acquisition characteristics.
format	Artículo
author	Maurent, Eliott y siete autores más
author_facet	Maurent, Eliott y siete autores más
author_sort	Maurent, Eliott
title	Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
title_short	Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
title_full	Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
title_fullStr	Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
title_full_unstemmed	Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
title_sort	multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density
publisher	Elsevier
publishDate	2023
url	https://repositorio.catie.ac.cr/handle/11554/12229
work_keys_str_mv	AT maurenteliott multisensorairbornelidarrequiresintercalibrationforconsistentestimationoflightattenuationandplantareadensity AT ysieteautoresmas multisensorairbornelidarrequiresintercalibrationforconsistentestimationoflightattenuationandplantareadensity
_version_	1808116840440791040

Multi-sensor airborne lidar requires intercalibration for consistent estimation of light attenuation and plant area density

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