Table of Contents
What is spectral properties of water bodies?
When measuring the spectral properties of water bodies, total radiance recorded by a sensor is a function of EMR received from four sources: (i) radiation that never reaches the water surface (atmospheric noise or path radiance); (ii) radiation that reaches the water surface but is reflected in the top few millimeters; …
What is spectral in chemistry?
A spectrum is defined as the characteristic wavelengths of electromagnetic radiation (or a portion thereof) that is emitted or absorbed by an object or substance, atom, or molecule. Plural: Spectra.
What does spectral mean in math?
In mathematics, spectral theory is an inclusive term for theories extending the eigenvector and eigenvalue theory of a single square matrix to a much broader theory of the structure of operators in a variety of mathematical spaces.
What is a spectral parameter?
The spectral parameter used in illuminating engineering is almost always wavelength, λ, in units of nanometer (nm = 10-9 m), micrometer (μm = 10-6 m) or Ångstromi (Å = 10-10 m). The name wavelength and symbol λ will be used as the spectral parameter in this publication except where otherwise specifically indicated.
What is spectral reflectance?
The spectral reflectance is the reflectance measured at a given Ts and λ, within a small wavelength interval, Δλ, centered at λ [7]. Spectral reflectance is typically named monochromatic reflectance and may be specular, diffuse, or hemispherical.
What is a spectral signature in remote sensing?
Spectral signature is the variation of reflectance or emittance of a material with respect to wavelengths (i.e., reflectance/emittance as a function of wavelength). Calibrating spectral signatures under specific illumination are collected in order to apply a correction to airborne or satellite imagery digital images.
What is difference between spectra and spectrum?
A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without gaps, across a continuum. Spectrum has since been applied by analogy to topics outside optics.
What does the spectral theorem say?
The spectral theorem shows that there is no loss of generality in assuming that A is the multiplication induced by X, say, on a measure space X with measure ,u.
What is the spectral theorem in linear algebra?
In mathematics, particularly linear algebra and functional analysis, a spectral theorem is a result about when a linear operator or matrix can be diagonalized (that is, represented as a diagonal matrix in some basis).
Why is spectral theory useful?
The spectral theorem in the finite-dimensional case is important in spectral graph theory: the adjacency matrix and Laplacian of an undirected graph are both symmetric, hence both have real eigenvalues and an orthonormal basis of eigenvectors, and this is important to many applications of these matrices, e.g. to the …
What is spectral curve?
A curve that illustrates the reflectance of light from a surface, such as paper, wavelength-by-wavelength throughout the visible spectrum, as a means of determining the color of that surface.