Results 211 to 220 of about 844 (236)
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Icarus, 2020
Abstract We have acquired a comprehensive laboratory bidirectional measurements of Apollo 11 and Apollo 16 lunar soil samples and have successfully fit photometric models to the laboratory data and have determined the solar spectrum averaged hemispheric reflectance as a function of incidence angle. The Apollo 11 (sample 10,084) and 16 (sample 68,810)
Emily J. Foote +4 more
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Abstract We have acquired a comprehensive laboratory bidirectional measurements of Apollo 11 and Apollo 16 lunar soil samples and have successfully fit photometric models to the laboratory data and have determined the solar spectrum averaged hemispheric reflectance as a function of incidence angle. The Apollo 11 (sample 10,084) and 16 (sample 68,810)
Emily J. Foote +4 more
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Retrieval of surface directional reflectance and hemispherical albedo using multi-angle measurements
Proceedings of IGARSS '93 - IEEE International Geoscience and Remote Sensing Symposium, 2002Atmospheric correction schemes, using various levels of approximation, are described to retrieve surface bidirectional reflectance factors (BRFs) and directional hemispherical reflectances (albedos) from multi-angle radiance measurements. Observational scenarios include measurements from space-based and airborne platforms and from the ground.
J.V. Martonchik +3 more
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A field study of the hemispherical directional reflectance factor and spectral albedo of dry snow
Journal of Geophysical Research: Atmospheres, 2006Hemispherical directional reflectance factors (HDRF) were collected under solar zenith angles from 49° to 85°. The experimental site was the Greenland Summit Environmental Observatory (72°35′N, 34°30′W, 3203 m above sea level) where both the snow and the atmosphere are very clean. The observations were carried out for two prevailing snow surface types:
Bourgeois, C. Saskia +2 more
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Remote Sensing of Environment, 2019
Abstract As an important indicator of plant photosynthetic activity, leaf chlorophyll content (LCC) has often been estimated non-destructively in the past decades from reflectance spectra measured with various spectrometers and leaf-holding accessories. Most studies established LCC predictive models with either integrating sphere measured directional-
Dong Li +8 more
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Abstract As an important indicator of plant photosynthetic activity, leaf chlorophyll content (LCC) has often been estimated non-destructively in the past decades from reflectance spectra measured with various spectrometers and leaf-holding accessories. Most studies established LCC predictive models with either integrating sphere measured directional-
Dong Li +8 more
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Journal of Quantitative Spectroscopy and Radiative Transfer, 2001
Abstract Spectral radiative properties (absorption coefficient, scattering coefficient and phase function) of open cell polyurethane foam are determined from parameter identification method. This method uses spectral transmittance and reflectance measurements in the wavelength infrared region of 2– 15 μm .
Dominique Baillis +2 more
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Abstract Spectral radiative properties (absorption coefficient, scattering coefficient and phase function) of open cell polyurethane foam are determined from parameter identification method. This method uses spectral transmittance and reflectance measurements in the wavelength infrared region of 2– 15 μm .
Dominique Baillis +2 more
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IEEE International IEEE International IEEE International Geoscience and Remote Sensing Symposium, 2004. IGARSS '04. Proceedings. 2004, 2004
Broadband albedo is an important geophysical parameter in the Earth surface-atmosphere interaction in global climate change, hydrological cycle and snowmelt runoff studies. To derive the broadband albedo accurately from satellite optical sensor observation at limited bands and at a single observation angle, the bidirectional reflectance factor (BRF ...
Shusun Li, Xiaobing Zhou
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Broadband albedo is an important geophysical parameter in the Earth surface-atmosphere interaction in global climate change, hydrological cycle and snowmelt runoff studies. To derive the broadband albedo accurately from satellite optical sensor observation at limited bands and at a single observation angle, the bidirectional reflectance factor (BRF ...
Shusun Li, Xiaobing Zhou
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SPIE Proceedings, 2014
Small unmanned aerial vehicle (UAV) and a prototype hyperspectral imaging camera (HSI) was used to measure the hemispherical directional reflectance factor (HDRF) of a test field with known light scattering properties. The HSI acquires a burst of 24 images within two seconds and all of these images are acquired with different spectral content. By using
T. Hakala, E. Honkavaara, L. Markelin
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Small unmanned aerial vehicle (UAV) and a prototype hyperspectral imaging camera (HSI) was used to measure the hemispherical directional reflectance factor (HDRF) of a test field with known light scattering properties. The HSI acquires a burst of 24 images within two seconds and all of these images are acquired with different spectral content. By using
T. Hakala, E. Honkavaara, L. Markelin
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We present a robust methodology to improve the accuracy of relative calibration in bi-directional reflectance distribution function (BRDF) measurements using 99\% nominal reflectance Spectralon (P99) standards. Conventional single-angle calibration approaches can introduce significant uncertainties because Spectralon exhibits non-Lambertian scattering ...
Han Zheng, Hao Zhang
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Han Zheng, Hao Zhang
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