06-Hyperspectral

06-Hyperspectral - 4/23/2008 ESM 266: Hyperspectral remote...

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Unformatted text preview: 4/23/2008 ESM 266: Hyperspectral remote sensing 1 ESM 266: ESM 266: Hyperspectral Hyperspectral remote sensing remote sensing Hyperspectral Hyperspectral a terrible term a terrible term Imaging spectrometry, imaging spectroscopy hyperspectral (too many, excessive): 100s of bands Ultraspectra : 1000s of bands 2 Ultraspectral: 1000s of bands Generally we mean measuring the reflected or emitted radiation at a fine enough spectral resolution to identify materials 3 Example Example the mineral alunite the mineral alunite from Roger Clark, Spectroscopy of Rocks and Minerals 4 Alunite at various spectral resolutions Alunite at various spectral resolutions from Roger Clark, Spectroscopy of Rocks and Minerals 5 Atmospheric transmissivity Atmospheric transmissivity 4/23/2008 ESM 266: Hyperspectral remote sensing 2 N=n+ik, N=n+ik, Index of refraction (complex) Index of refraction (complex) i r I I dl 7 sin sin i r c n c = = 4 4 kl dI k I dl I e I = = Optical properties of ice and water Optical properties of ice and water Snow is a Snow is a collection of collection of scattering scattering grains grains Basic scattering properties of a Basic scattering properties of a single grain (ice, mineral, etc) single grain (ice, mineral, etc) Mie theory, based on N and x=2 r/ single- 10 scattering albedo g asymmetry parameter Q ext extinction efficiency Snow spectral reflectance and absorption Snow spectral reflectance and absorption coefficient of ice coefficient of ice Dust Dust and and algae algae 4/23/2008 ESM 266: Hyperspectral remote sensing 3 Spectral reflectance of dirty snow and snow Spectral reflectance of dirty snow and snow with red algae ( with red algae ( Chlamydomonas...
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06-Hyperspectral - 4/23/2008 ESM 266: Hyperspectral remote...

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