on January 30, 2023
How can we calculate the area of dense and sparse vegetation from NDVI image in QGIS?
Geographic Information SystemsContents:
How do you calculate NDVI from an image?
4. How To Calculate NDVI? NDVI is calculated with the following expression: NDVI = (NIR-Red) / (NIR+Red), where NIR is near-infrared light and Red is visible red light. There’s a great number of free online GIS tools that allow you to instantly calculate NDVI.
How to calculate NDVI in QGIS?
To calculate NDVI in QGIS, use the raster calculator to subtract values of the Red band from the Near-infrared (NIR) band, then divide by the sum of the Red and NIR bands. All you need is reflectance values in the Red and NIR bands from any kind of imagery and an installation of QGIS.
How to calculate NDVI?
As mentioned in the previous chapter, the NDVI is the normalized difference of the red and the infrared band, calculated as NDVI = (NIR-RED) / (NIR+RED).
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