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Polarised multiangular reflectance measurements using the finnish geodetic institute field goniospectrometer.

Suomalainen J, Hakala T, Peltoniemi J, Puttonen E - Sensors (Basel) (2009)

Bottom Line: The angles are registered at accuracies better than 2°.During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe.The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

View Article: PubMed Central - PubMed

Affiliation: Finnish Geodetic Institute, Box 15, 02431 Masala, Finland; E-Mails: teemu.hakala@fgi.fi (T.H.); jouni.peltoniemi@fgi.fi (J.P.); eetu.puttonen@fgi.fi (E.P.).

ABSTRACT
The design, operation, and properties of the Finnish Geodetic Institute Field Goniospectrometer (FIGIFIGO) are presented. FIGIFIGO is a portable instrument for the measurement of surface Bidirectional Reflectance Factor (BRF) for samples with diameters of 10 - 50 cm. A set of polarising optics enable the measurement of linearly polarised BRF over the full solar spectrum (350 - 2,500 nm). FIGIFIGO is designed mainly for field operation using sunlight, but operation in a laboratory environment is also possible. The acquired BRF have an accuracy of 1 - 5% depending on wavelength, sample properties, and measurement conditions. The angles are registered at accuracies better than 2°. During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe. The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

No MeSH data available.


Reflectance properties of white Spectralon panel at 38° illumination zenith angle. (Top middle) Photograph of the target (Left) Bidirectional reflectance factor of Spectralon at a green spectral band as a function of view direction. (Bottom middle) Reflectance factor spectrum at three view angles on the principal plane. (Top right) Degree of polarisation ({H - V}/{H + V}) of reflected light at a green spectral band as a function of view direction. (Bottom right) Degree of polarisation spectrum at three view angles on principal plane
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f7-sensors-09-03891: Reflectance properties of white Spectralon panel at 38° illumination zenith angle. (Top middle) Photograph of the target (Left) Bidirectional reflectance factor of Spectralon at a green spectral band as a function of view direction. (Bottom middle) Reflectance factor spectrum at three view angles on the principal plane. (Top right) Degree of polarisation ({H - V}/{H + V}) of reflected light at a green spectral band as a function of view direction. (Bottom right) Degree of polarisation spectrum at three view angles on principal plane

Mentions: During the last few years, FIGIFIGO has been used in the measurement of more than 150 samples, concentrating on forest understorey vegetation [2,20], snow [21], urban surfaces [22], and airborne sensor reflectance calibration surfaces [23,24]. Polarised measurements have been conducted for approximately 20 samples [25,26]. Two examples from our reflectance library are presented in Figures 7 and 8.


Polarised multiangular reflectance measurements using the finnish geodetic institute field goniospectrometer.

Suomalainen J, Hakala T, Peltoniemi J, Puttonen E - Sensors (Basel) (2009)

Reflectance properties of white Spectralon panel at 38° illumination zenith angle. (Top middle) Photograph of the target (Left) Bidirectional reflectance factor of Spectralon at a green spectral band as a function of view direction. (Bottom middle) Reflectance factor spectrum at three view angles on the principal plane. (Top right) Degree of polarisation ({H - V}/{H + V}) of reflected light at a green spectral band as a function of view direction. (Bottom right) Degree of polarisation spectrum at three view angles on principal plane
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3297140&req=5

f7-sensors-09-03891: Reflectance properties of white Spectralon panel at 38° illumination zenith angle. (Top middle) Photograph of the target (Left) Bidirectional reflectance factor of Spectralon at a green spectral band as a function of view direction. (Bottom middle) Reflectance factor spectrum at three view angles on the principal plane. (Top right) Degree of polarisation ({H - V}/{H + V}) of reflected light at a green spectral band as a function of view direction. (Bottom right) Degree of polarisation spectrum at three view angles on principal plane
Mentions: During the last few years, FIGIFIGO has been used in the measurement of more than 150 samples, concentrating on forest understorey vegetation [2,20], snow [21], urban surfaces [22], and airborne sensor reflectance calibration surfaces [23,24]. Polarised measurements have been conducted for approximately 20 samples [25,26]. Two examples from our reflectance library are presented in Figures 7 and 8.

Bottom Line: The angles are registered at accuracies better than 2°.During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe.The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

View Article: PubMed Central - PubMed

Affiliation: Finnish Geodetic Institute, Box 15, 02431 Masala, Finland; E-Mails: teemu.hakala@fgi.fi (T.H.); jouni.peltoniemi@fgi.fi (J.P.); eetu.puttonen@fgi.fi (E.P.).

ABSTRACT
The design, operation, and properties of the Finnish Geodetic Institute Field Goniospectrometer (FIGIFIGO) are presented. FIGIFIGO is a portable instrument for the measurement of surface Bidirectional Reflectance Factor (BRF) for samples with diameters of 10 - 50 cm. A set of polarising optics enable the measurement of linearly polarised BRF over the full solar spectrum (350 - 2,500 nm). FIGIFIGO is designed mainly for field operation using sunlight, but operation in a laboratory environment is also possible. The acquired BRF have an accuracy of 1 - 5% depending on wavelength, sample properties, and measurement conditions. The angles are registered at accuracies better than 2°. During 2004 - 2008, FIGIFIGO has been used in the measurement of over 150 samples, all around northern Europe. The samples concentrate mostly on boreal forest understorey, snow, urban surfaces, and reflectance calibration surfaces.

No MeSH data available.