color and spectral signatures
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Color and Spectral Signatures. Steve Dutch University of Wisconsin-Green Bay. It’s a Colorful World. Color and Wavelength. Color Formalisms. Physical Optics Scattering is most important in Remote Sensing Color Centers and Crystal-Field Effects Individual atoms interact with light - PowerPoint PPT PresentationTRANSCRIPT
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Color and Spectral SignaturesSteve Dutch
University of Wisconsin-Green Bay
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It’s a Colorful World
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Color and Wavelength
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Color Formalisms• Physical Optics– Scattering is most important in Remote Sensing
• Color Centers and Crystal-Field Effects– Individual atoms interact with light
• Inter-Atomic Interactions– Charge transfer– Molecular orbitals– Vibrations
• Band Theory– Applicable to radar, not much to passive
remote sensing
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Physical Optics• Scattering– Particulate Matter
• Dispersion– Rainbows, etc.
• Interference– Oil slicks, sea shells
• Diffraction– Opal, CD’s
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Scattering
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Scattering
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Anti-Crepuscular Rays
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Major Types of Scattering
• Rayleigh scattering – Small particle compared to wavelength of light
• Mie scattering – Particle about the same size as wavelength of light
• Geometric scattering – Particle much larger than wavelength of light
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Rayleigh Scattering• Molecules and nanoparticles• Proportional to 1/λ4
• Blue vs. Red = (700nm/400nm)4 = 9.4• Why the sky is blue• Why isn’t the sky purple?– Less sunlight– Lower eye sensitivity– Greater absorption
• UV Scattering useful in particle studies
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Mie Scattering• Responsible for most white colors• Cloud particles• Oil droplets in contaminated water• Suspended sediment• Algal blooms
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Multiple and Mie
Scattering
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Backscattering
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Atomic Emission and Absorption
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Quantum Pinball
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Fluorescence(Sunlight and laser induced fluoresence in chlorophyll)
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Phosphorescence
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Electrons and Light
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Coloring Agents in Minerals
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Iron is the Main Source of Color in Rocks and Soils
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Charge Transfer
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Charge Transfer
• Electron bumped between atoms• Extremely effective absorption mechanism• A major reason UV is not very useful for
surface remote sensing• Very strong UV and blue absorption in iron
oxide• Why we have “earth tones”
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Molecular Orbitals
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Molecular Orbitals
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Chlorophyll
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Water Vibration Modes
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What Color is Water?
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What Color is Ice?
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Spectrum of Water
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