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GEOG 330 Chapter 7-1

GEOG 330 Chapter 7-1 - GEOGRAPHY 330 REMOTE SENSING IN THE...

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GEOGRAPHY 330 REMOTE SENSING IN THE VISIBLE AND NEAR-INFRARED Spectral Properties of Earth Surface Materials
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Eyes are our “remote sensors” They detect visible electromagnetic energy Photo by F. Sabin ©
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Other sensors enable us to detect more than the eye can see Photos by F. Sabin ©
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Understanding Spectral Signatures
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Spectral Properties of Earth Surfaces
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The Reflectance “Signatures” of Different Targets
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Spectral Properties of Earth Surfaces
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Visible Light Interaction with Pigments in the Palisade Cells ! Palisade cells contain chlorophyll pigments responsible for the absorption of the Blue and Red lights. ! Chlorophyll pigments produce a relatively lower absorption or higher reflection of the green light. ! This causes healthy foliage with a high chlorophyll content to appear green to our eyes.
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NIR Energy Interaction with the Spongy Mesophyll Cells ! In a typical healthy green leaf, the NIR reflectance increases dramatically in the region from 700 – 1200 nm.
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