NDVI Normalized difference vegetation index Band Ratios in Remote Sensing KEY REFERENCE: Kidwell, K.B., 1990, Global Vegetation Index User's Guide, U.S.

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Presentation transcript:

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.

First: A few Simple Reminders about Spectral Signatures Thanks to Robin Weeks

Laboratory Spectral Signatures II Common Urban Materials Healthy grass Concrete Astroturf wavelength Thanks to Robin Weeks

The Effect of the Atmosphere on Spectral Data Path Radiance (L p ) Atmospheric Transmissivity (T) Thanks to Robin Weeks

Effect of Topography on Scatterplots Grassy fields Bare ground Water/ shade Flat terrain Terrain with topography Terrain without topography Thanks to Robin Weeks

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

(courtesy NDVI

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: