General presentation of the data:

The database contains BRF measurements of leaves made with a conoscope (a system using a Fourier optic lens). The system used was an EZ-Contrast 80M of the Eldim SA company. The measurements were all performed in the Muséum d’Histoire Naturelle de Paris at the CRCC lab. Those measurement were made possible thanks to the ‘SURFEUILLE’ grant supported by the French National Remote Sensing Programme (PNTS)

The pre-processing made to convert relative luminance outputs of the system to BRF measurements as well as specification on the X Y Z wavelength (or Red Green Blue) are described in the paper related to this data set (Comar et al, 2012).

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The data correspond to 3 replicates measurements of 5 healthy wheat leaves (Isildur cultivar) for 3 wavebands and 2 illumination angles ( Theta_S = 45°, Phi_S = [ 0°, 90°]), leading to 90 files. For more details, please refer to the article.

Organization of the database

The Data proposed are BRF. The correction method which allowed us to transform relative luminance outputs of the EZ-Contrast80M to BRF is described in the article.

The naming of the files is the following:

• Leaf One of the 5 leaves used in this study.
• Rep One of the 3replications located at the same spot for wavelength but not for the illumination configuration because we repositioned the leaf for each illumination configuration.
• Band [ X Y Z] corresponds to the [ Red Green Blue] wavebands, following the 1931 CIE standards.
• Phi corresponds to the illumination configuration. 0° is parallel to the veins and 90° is perpendicular to the veins.

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For example, the file Leaf1_rep1_X_Phi0.csv outputs an 80*360 matrix with of the BRF measurements made on Leaf 1, first repetition on Red wavelength with the illumination azimuth parallel to the wheat leaves veins.

The file format is the following:

• 80 rows corresponding to the 80 zenith observation angles of resolution of 1° covering the 0-80° range.
• 360 columns correspond to the azimuth angle with a resolution of 1° covering the 0-360° range.

DOWNLOAD THE LeafBRF database

When publishing results using this database, please refer to the article published in Remote Sensing of Environment and to this web page.

Contact

Frédéric Baret, Alexis Comar

Reference

Comar, A., Baret, F., Viénot, F., Yan, L. and de Solan, B., 2012. Wheat leaf bidirectional reflectance measurements: Description and quantification of the volume, specular and hot-spot scattering features. Remote Sensing of Environment, 121(0): 26-35.[URL]