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NDVI Normalized difference vegetation index Band Ratios in Remote Sensing KEY REFERENCE: Kidwell, K.B., 1990, Global Vegetation Index User's Guide, U.S. Department of Commerce/National Oceanic and Atmospheric Administration/National Environmental Satellite Data and Information Service/National Climatic Data Center/Satellite Data Services Division.
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First: A few Simple Reminders about Spectral Signatures Thanks to Robin Weeks
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Laboratory Spectral Signatures II Common Urban Materials Healthy grass Concrete Astroturf wavelength Thanks to Robin Weeks
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The Effect of the Atmosphere on Spectral Data Path Radiance (L p ) Atmospheric Transmissivity (T) Thanks to Robin Weeks
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Effect of Topography on Scatterplots Grassy fields Bare ground Water/ shade Flat terrain Terrain with topography Terrain without topography Thanks to Robin Weeks
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Vegetation: Pigment in Plant Leaves (Chlorophyll) strongly absorbs visible light (0.4 to 0.7 μm) Cell Structure however strongly reflects Near-IR (0.7 – 1.1 μm) Thanks to Robin Weeks
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(courtesy http://earthobservatory.nasa.gov)http://earthobservatory.nasa.gov NDVI
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NDVI: NearIR – Red / NearIR + Red Band 3 Band 4 Band 3 Band 4 Soil Green Vegetation Shade/ Water Band 3 Band 4 Band 4 - Band 3 Band 4 + Band 3 Simple Ratio NDVI When using LANDSAT:
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