on January 31, 2023
Calculating NDWI in Erdas IMAGINE 2014
Geographic Information SystemsContents:
How is NDWI calculated?
NDWI = (G-NIR)/(G+NIR)
The Normalized Difference Water Index (NDWI) is derived from the Near-Infrared (NIR) and Green (G) channels. This formula highlights the amount of water in water bodies.
How do you calculate NDVI and NDWI?
NDVI = (NIR – Red) / (NIR + Red)
Higher the value of NDVI reflects high Near Infrared (NIR), means dense greenery. Generally, we obtain following result: NDVI = -1 to 0 represent Water bodies. NDVI = -0.1 to 0.1 represent Barren rocks, sand, or snow.
How is NDVI calculated in erdas imagine?
NDVI= (NIR-Red) / (NIR + Red)
Pixels with low values close to 0 are bare areas (soils, pavement, etc.)
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