Use Red Edge NDVI when you need to 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. Enter NIR reflectance and Red edge reflectance using the definitions and units below so the result can be reproduced.

NIR reflectance

Near-infrared reflectance between 0 and 1.

Red edge reflectance

Red edge reflectance between 0 and 1.

The published tool contract uses this rule: 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.

Red edge NDVI

Red edge NDVI value between -1 and 1; signed.

The calculation does not propagate measurement uncertainty, sampling error, or biological and chemical variability. NIR reflectance must remain between 0 and 1; Red edge reflectance must remain between 0 and 1.

Retain the original NIR reflectance and Red edge reflectance values and their units alongside the result. NDVI Calculator is useful when you instead 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. Red Cell Concentration provides another view by helping you convert cells counted in a hemocytometer square into a red cell concentration in millions per microliter using countedCells x dilutionFactor / 10.

• 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.

• Red Cell Concentration

  Convert cells counted in a hemocytometer square into a red cell concentration in millions per microliter using countedCells x dilutionFactor / 10.

• RDW-CV Percent

  Compute red cell distribution width CV from RBC volume standard deviation and MCV.