Key words: Leaf reflectance
, Leaf absorbance, Chlorophyll content, Vegetation index, Correlation map.
This microstructure has been found to transform a transparent film into an opaque film with high diffused reflectance
To detect RIFA nests, the spectral reflectances
of 4 kinds of soil samples, namely, RIFA nest soil, ordinary soil surrounding RIFA mounds, nearby grass, and bare sand in the same environment were compared using spectral technology.
Natural snowcovered ice had high reflectance
in winter (FebruaryMarch), bulk PAR reflectances
ranging from 0.
Given a surface reflectance
p and direct illuminance ED due to the luminaires, it is:
i] is the ith measurement of spectral reflectance
, and n is the number of measurements.
data for non aged and aged filter papers soaked in surface active agent (SAA) solution are presented at Fig.
The integrated absorptivities are lower for the high temperature emitters because their emissions are mostly in the near infrared region where the spectral reflectances
of the coatings are higher.
We see that there are systematic differences between the lowland mire reflectances
measured in wet and dry years.
Among the six broad wavebands, reflectances
in red and NIR bands were most highly correlated with forage NDF, ADF, CP concentration, aboveground biomass, and CP availability (Fig.
The work reported here was part of an effort arising from a competency project entitled "Measurement Science for Optical Reflectance
and Scattering" involving four laboratories at NIST: the Building and Fire Research Laboratory, the Information Technology Laboratory, the Manufacturing Engineering Laboratory, and the Physics Laboratory.
Spectral indices with reflectance
factors, such as NDVI and waveband ratios based on simple combinations of visible and near-infrared reflectances
, have been widely used in the past decades to monitor and estimate vegetation (Daughtry et al.