NDVI Calculator
Compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
Description
Compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
NDVI Calculator is a focused biology tool that compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero. It calculates locally from the values you enter and exposes the result without changing the source observations.1
When to use NDVI Calculator
Use NDVI Calculator when you need to compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero. Enter NIR reflectance and Red reflectance using the definitions and units below so the result can be reproduced.
- NIR reflectance
- Near-infrared reflectance between 0 and 1.
- Red reflectance
- Red-band reflectance between 0 and 1.
How NDVI Calculator calculates the result
The published tool contract uses this rule: Compute the Normalized Difference Vegetation Index as (NIR - red) / (NIR + red) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
- NDVI
- NDVI value between -1 and 1.
Limitations of NDVI Calculator
The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability. NIR reflectance must remain between 0 and 1; Red reflectance must remain between 0 and 1.
Alternative or Complementary measurements
Retain the original NIR reflectance and Red reflectance values and their units alongside the result. EVI Calculator is useful when you instead need to compute the Enhanced Vegetation Index as 2.5 * (NIR - red) / (NIR + 6 * red - 7.5 * blue + 1) from reflectances between zero and one, rejecting degenerate reflectances that zero the denominator. Red Edge NDVI provides another view by helping you compute the red edge normalized difference vegetation index as (NIR - red edge) / (NIR + red edge) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
References
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Normalized difference vegetation index — Wikipedia contributors
Similar or alternative tools
- EVI Calculator
Compute the Enhanced Vegetation Index as 2.5 * (NIR - red) / (NIR + 6 * red - 7.5 * blue + 1) from reflectances between zero and one, rejecting degenerate reflectances that zero the denominator.
- Red Edge NDVI
Compute the red edge normalized difference vegetation index as (NIR - red edge) / (NIR + red edge) from reflectances between zero and one, rejecting dark pixels whose reflectances sum to zero.
- CWSI Calculator
Compute the crop water stress index as (canopy temperature - wet reference temperature) / (dry reference temperature - wet reference temperature), clamped to the range zero through one.