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How is the NDVI used in image analysis?
The NDVI is a standardized index allowing you to generate an image displaying greenness (relative biomass). This index takes advantage of the contrast of the characteristics of two bands from a multispectral raster dataset—the chlorophyll pigment absorptions in the red band and…
When to use band arithmetic instead of NDVI?
Optionally, check Scientific Output. The Band Arithmetic function will be used instead of the NDVI function, since the Band Arithmetic function will output values between -1.0 and 1.0. Whereas, the NDVI function will scale the values to a range of 0–200, which can easily be rendered with a specific color ramp or color map.
How to change the red band in NDVI?
Change the inputs for the Red Band and Infrared Band . By default, the Red Band is 3 and the Infrared Band is 4. You may need to look at the metadata for your imagery to determine which bands to use. If, for example, you have a three-band color infrared image, the Infrared Band may be 1 and the Red Band may be 2. Optionally, check Use Wavelength.
How to add NDVI output to table of contents?
Click the NDVI button . The output is added as a temporary layer to the table of contents. By default, a color map renderer is applied using a color map where green represents vegetation, unless the Scientific Output option is checked.
How to calculate the NDVI in raster data?
To calculate NDVI, you use the following formula where NIR is near infrared light and red represents red light. For your raster data, you will take the reflectance value in the red and near infrared bands to calculate the index.
Which is the correct formula to calculate NDVI?
To calculate NDVI, you use the following formula where NIR is near infrared light and red represents red light. For your raster data, you will take the reflectance value in the red and near infrared bands to calculate the index. (NIR – Red) / (NIR + Red)
Why is the NDVI index used in ArcGIS Pro?
This index takes advantage of the contrast of the characteristics of two bands from a multispectral raster dataset—the chlorophyll pigment absorptions in the red band and the high reflectivity of plant materials in the near-infrared (NIR) band. For information about other multiband raster indexes, see the Band Arithmetic raster function.