Premium
Multi‐angular spectral reflectance to characterize the particle size of surfaces of desert and cultivated soil
Author(s) -
Lv Y.,
Sun Z.
Publication year - 2016
Publication title -
european journal of soil science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.244
H-Index - 111
eISSN - 1365-2389
pISSN - 1351-0754
DOI - 10.1111/ejss.12341
Subject(s) - particle size , particle (ecology) , reflectivity , particulates , particle size distribution , scattering , range (aeronautics) , anisotropy , mineralogy , optics , materials science , chemistry , physics , geology , composite material , oceanography , organic chemistry
This research examines the distribution of bi‐conical reflectance of particulate surfaces with different particle sizes by multi‐angular reflectance. Two types of particulate samples (called desert and cultivated soil) were sieved to a particle size range of 0.15–0.9 mm. The reflectance factors were measured at 570 or 330 different viewing positions for each illumination angle (45° and 60°). The reflectance was strongly non‐Lambertian for all samples, but with markedly different patterns for the two types of particulate surface. Particle size was correlated with the bi‐conical reflectance factor ( BCRF ) and anisotropic reflectance factor ( ARF ), respectively. The results showed a strong relation between BCRF and particle size in all viewing directions, except for the backward scattering direction, with an average R 2 value of 0.9. The use of ARF improved the relation with particle size more in the backward scattering direction in the principal plane than with BCRF ( R 2 = 0.7 for BCRF ; R 2 = 0.91 for ARF ). However, the strong relation between the ARF and particle size was limited in the forward and backward scattering directions, with an average R 2 value of 0.86. The results showed the considerable potential of multi‐angular reflectance for quantitative evaluation of the particle size of particulate surfaces. This approach appears to provide a promising empirical and theoretical basis for the future retrieval of soil particle size. Highlights: The aim is to estimate the particle size from the reflectance of soil samples. Analysis of the relation between particle size and reflectance with multi‐angular data. There was a strong relation between reflectance and particle size in 2π space. Multi‐angular reflectance has the potential to evaluate quantitatively the particle size of soil.