A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies

J.G.P.W. Clevers, H. Bartholomeus, M.E. Schaepman, G. Schaepman-Strub, H. Jalink, R. van der Schoor, A. de Jong, M. Uiterwijk

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

Abstract

Recently, a laboratory measurement facility has been realized for assessing the anisotropic reflectance and emittance behaviour of soils, leaves and small canopies under controlled illumination conditions. The facility consists of an ASD FieldSpec 3 spectroradiometer covering the spectral range from 350 – 2500 nm at 1 nm spectral sampling interval. The spectroradiometer is deployed using a fiber optic cable with either a 1°, 8° or 25° instantaneous field of view (IFOV). These measurements can be used to assess the plant pigment (chlorophyll, xanthophyll, etc.) and non-pigment system (water, cellulose, lignin, nitrogen, etc.). The thermal emittance is measured using a NEC TH9100 Infrared Thermal Imager. It operates in a single band covering the spectral range from 8 – 14 mm with a resolution of 0.02 K. Images are 320 (H) by 240 (V) pixels with an IFOV of 1.2 mrad. A 1000 W Quartz Tungsten Halogen (QTH) lamp is used as illumination source, approximating the radiance distribution of the sun. This one is put at a fixed position during a measurement session. Multi-angular measurements are achieved by using a robotic positioning system allowing to perform either reflectance or emittance measurements over almost a complete hemisphere. The hemisphere can be sampled continuously between 0° and 80° from nadir and up to a few degrees from the hot-spot configuration (depending on the IFOV of the measurement device) for a backscattering target. Measurement distance to targets can be varied between 0.25 and 1 m, although with a distance of more than 0.6 m it is not possible to cover the full hemisphere. The goal is to infer the BRDF (bidirectional reflectance distribution function) and BTDF (bidirectional thermal distribution function) from these multi-angular measurements for various surface types (like soils, agricultural crops, small tree canopies and artificial objects) and surface roughness. The steering of the robotic arm and the reading of the spectroradiometer and the thermal camera are all fully automated.
Original languageEnglish
Title of host publicationProceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011
EditorsT. Malthus, A. MacArthur
Place of PublicationEdinburgh, UK
PublisherEARSeL
Pages10
Publication statusPublished - 2011
Event7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK -
Duration: 11 Apr 201113 Apr 2011

Workshop

Workshop7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK
Period11/04/1113/04/11

Fingerprint

bidirectional reflectance
canopies
emittance
soils
distribution functions
spectroradiometers
hemispheres
field of view
coverings
illumination
robot arms
reflectance
lignin
crops
chlorophylls
pigments
robotics
radiance
cellulose
halogens

Cite this

Clevers, J. G. P. W., Bartholomeus, H., Schaepman, M. E., Schaepman-Strub, G., Jalink, H., van der Schoor, R., ... Uiterwijk, M. (2011). A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies. In T. Malthus, & A. MacArthur (Eds.), Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011 (pp. 10). Edinburgh, UK: EARSeL.
Clevers, J.G.P.W. ; Bartholomeus, H. ; Schaepman, M.E. ; Schaepman-Strub, G. ; Jalink, H. ; van der Schoor, R. ; de Jong, A. ; Uiterwijk, M. / A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies. Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011. editor / T. Malthus ; A. MacArthur. Edinburgh, UK : EARSeL, 2011. pp. 10
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abstract = "Recently, a laboratory measurement facility has been realized for assessing the anisotropic reflectance and emittance behaviour of soils, leaves and small canopies under controlled illumination conditions. The facility consists of an ASD FieldSpec 3 spectroradiometer covering the spectral range from 350 – 2500 nm at 1 nm spectral sampling interval. The spectroradiometer is deployed using a fiber optic cable with either a 1°, 8° or 25° instantaneous field of view (IFOV). These measurements can be used to assess the plant pigment (chlorophyll, xanthophyll, etc.) and non-pigment system (water, cellulose, lignin, nitrogen, etc.). The thermal emittance is measured using a NEC TH9100 Infrared Thermal Imager. It operates in a single band covering the spectral range from 8 – 14 mm with a resolution of 0.02 K. Images are 320 (H) by 240 (V) pixels with an IFOV of 1.2 mrad. A 1000 W Quartz Tungsten Halogen (QTH) lamp is used as illumination source, approximating the radiance distribution of the sun. This one is put at a fixed position during a measurement session. Multi-angular measurements are achieved by using a robotic positioning system allowing to perform either reflectance or emittance measurements over almost a complete hemisphere. The hemisphere can be sampled continuously between 0° and 80° from nadir and up to a few degrees from the hot-spot configuration (depending on the IFOV of the measurement device) for a backscattering target. Measurement distance to targets can be varied between 0.25 and 1 m, although with a distance of more than 0.6 m it is not possible to cover the full hemisphere. The goal is to infer the BRDF (bidirectional reflectance distribution function) and BTDF (bidirectional thermal distribution function) from these multi-angular measurements for various surface types (like soils, agricultural crops, small tree canopies and artificial objects) and surface roughness. The steering of the robotic arm and the reading of the spectroradiometer and the thermal camera are all fully automated.",
author = "J.G.P.W. Clevers and H. Bartholomeus and M.E. Schaepman and G. Schaepman-Strub and H. Jalink and {van der Schoor}, R. and {de Jong}, A. and M. Uiterwijk",
year = "2011",
language = "English",
pages = "10",
editor = "T. Malthus and A. MacArthur",
booktitle = "Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011",
publisher = "EARSeL",

}

Clevers, JGPW, Bartholomeus, H, Schaepman, ME, Schaepman-Strub, G, Jalink, H, van der Schoor, R, de Jong, A & Uiterwijk, M 2011, A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies. in T Malthus & A MacArthur (eds), Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011. EARSeL, Edinburgh, UK, pp. 10, 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11/04/11.

A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies. / Clevers, J.G.P.W.; Bartholomeus, H.; Schaepman, M.E.; Schaepman-Strub, G.; Jalink, H.; van der Schoor, R.; de Jong, A.; Uiterwijk, M.

Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011. ed. / T. Malthus; A. MacArthur. Edinburgh, UK : EARSeL, 2011. p. 10.

Research output: Chapter in Book/Report/Conference proceedingConference paperAcademic

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AU - Schaepman, M.E.

AU - Schaepman-Strub, G.

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AU - de Jong, A.

AU - Uiterwijk, M.

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N2 - Recently, a laboratory measurement facility has been realized for assessing the anisotropic reflectance and emittance behaviour of soils, leaves and small canopies under controlled illumination conditions. The facility consists of an ASD FieldSpec 3 spectroradiometer covering the spectral range from 350 – 2500 nm at 1 nm spectral sampling interval. The spectroradiometer is deployed using a fiber optic cable with either a 1°, 8° or 25° instantaneous field of view (IFOV). These measurements can be used to assess the plant pigment (chlorophyll, xanthophyll, etc.) and non-pigment system (water, cellulose, lignin, nitrogen, etc.). The thermal emittance is measured using a NEC TH9100 Infrared Thermal Imager. It operates in a single band covering the spectral range from 8 – 14 mm with a resolution of 0.02 K. Images are 320 (H) by 240 (V) pixels with an IFOV of 1.2 mrad. A 1000 W Quartz Tungsten Halogen (QTH) lamp is used as illumination source, approximating the radiance distribution of the sun. This one is put at a fixed position during a measurement session. Multi-angular measurements are achieved by using a robotic positioning system allowing to perform either reflectance or emittance measurements over almost a complete hemisphere. The hemisphere can be sampled continuously between 0° and 80° from nadir and up to a few degrees from the hot-spot configuration (depending on the IFOV of the measurement device) for a backscattering target. Measurement distance to targets can be varied between 0.25 and 1 m, although with a distance of more than 0.6 m it is not possible to cover the full hemisphere. The goal is to infer the BRDF (bidirectional reflectance distribution function) and BTDF (bidirectional thermal distribution function) from these multi-angular measurements for various surface types (like soils, agricultural crops, small tree canopies and artificial objects) and surface roughness. The steering of the robotic arm and the reading of the spectroradiometer and the thermal camera are all fully automated.

AB - Recently, a laboratory measurement facility has been realized for assessing the anisotropic reflectance and emittance behaviour of soils, leaves and small canopies under controlled illumination conditions. The facility consists of an ASD FieldSpec 3 spectroradiometer covering the spectral range from 350 – 2500 nm at 1 nm spectral sampling interval. The spectroradiometer is deployed using a fiber optic cable with either a 1°, 8° or 25° instantaneous field of view (IFOV). These measurements can be used to assess the plant pigment (chlorophyll, xanthophyll, etc.) and non-pigment system (water, cellulose, lignin, nitrogen, etc.). The thermal emittance is measured using a NEC TH9100 Infrared Thermal Imager. It operates in a single band covering the spectral range from 8 – 14 mm with a resolution of 0.02 K. Images are 320 (H) by 240 (V) pixels with an IFOV of 1.2 mrad. A 1000 W Quartz Tungsten Halogen (QTH) lamp is used as illumination source, approximating the radiance distribution of the sun. This one is put at a fixed position during a measurement session. Multi-angular measurements are achieved by using a robotic positioning system allowing to perform either reflectance or emittance measurements over almost a complete hemisphere. The hemisphere can be sampled continuously between 0° and 80° from nadir and up to a few degrees from the hot-spot configuration (depending on the IFOV of the measurement device) for a backscattering target. Measurement distance to targets can be varied between 0.25 and 1 m, although with a distance of more than 0.6 m it is not possible to cover the full hemisphere. The goal is to infer the BRDF (bidirectional reflectance distribution function) and BTDF (bidirectional thermal distribution function) from these multi-angular measurements for various surface types (like soils, agricultural crops, small tree canopies and artificial objects) and surface roughness. The steering of the robotic arm and the reading of the spectroradiometer and the thermal camera are all fully automated.

M3 - Conference paper

SP - 10

BT - Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011

A2 - Malthus, T.

A2 - MacArthur, A.

PB - EARSeL

CY - Edinburgh, UK

ER -

Clevers JGPW, Bartholomeus H, Schaepman ME, Schaepman-Strub G, Jalink H, van der Schoor R et al. A new lab facility for measuring bidirectional reflectance/emittance distribution functions of soils and canopies. In Malthus T, MacArthur A, editors, Proceedings 7th EARSeL Workshop of the Special Interest Group in Imaging Spectroscopy, Edinburgh, Scotland, UK, 11 - 13 April, 2011. Edinburgh, UK: EARSeL. 2011. p. 10