EVI and NDVI range value

What is EVI value?

Enhanced Vegetation Index (EVI)



The value range for EVI is –1 to +1, and for healthy vegetation, it varies between 0.2 and 0.8. Formula: EVI = 2.5 * ((NIR – RED) / ((NIR) + (C1 * RED) – (C2 * BLUE) + L))
 

What is the value range of NDVI?

+1.0 to -1.0

NDVI values range from +1.0 to -1.0. Areas of barren rock, sand, or snow usually show very low NDVI values (for example, 0.1 or less).

What is the difference between NDVI and EVI?

EVI is similar to Normalized Difference Vegetation Index (NDVI) and can be used to quantify vegetation greenness. However, EVI corrects for some atmospheric conditions and canopy background noise and is more sensitive in areas with dense vegetation.

Can EVI be negative?

EVI is of the subtype which will return both positive and negative values. Positive values generally indicate the presence of vegetation (with greater values indicating healthier vegetation). Negative values generally indicate a lack of vegetation (water, rock, soil, etc.).
 

How is EVI measured?

By carefully measuring the wavelengths and intensity of visible and near-infrared light reflected by the land surface back up into space, scientists use an algorithm called a “Vegetation Index” to quantify the concentrations of green leaf vegetation around the globe.
 

What bands does EVI use?

EVI is an index of vegetation that is optimized to improve sensitivity to high biomass and better handling of background and atmospheric influences. It is calculated with the formula below using the Near Infrared (NIR), Red and Blue bands.

What does an NDVI value of 1 mean?

Normalized Difference Vegetation Index (NDVI):



In general, NDVI values range from -1.0 to 1.0, with negative values indicating clouds and water, positive values near zero indicating bare soil, and higher positive values of NDVI ranging from sparse vegetation (0.1 – 0.5) to dense green vegetation (0.6 and above).

What is maximum NDVI?

In most cases, NDVI values between 0.2 and 0.4 correspond to areas with sparse vegetation; moderate vegetation tends to vary between 0.4 and 0.6; anything above 0.6 indicates the highest possible density of green leaves.
 

What does NDVI of 1 mean?

Negative values of NDVI (values approaching -1) correspond to water. Values close to zero (-0.1 to 0.1) generally correspond to barren areas of rock, sand, or snow.

What are the minimum and maximum values of the NDVI layer?

The Normalized Difference Vegetation Index (NDVI) is a quantitative index of greenness ranging from 0-1, where 0 represents minimal or no greenness and 1 represents maximum greenness.
 

Is NDVI good high?

Overall, NDVI is a standardized way to measure healthy vegetation. When you have high NDVI values, you have healthier vegetation.
 

How do you read NDVI results?

Calculations of NDVI for a given pixel always result in a number that ranges from minus one (-1) to plus one (+1); however, no green leaves gives a value close to zero. A zero means no vegetation and close to +1 (0.8 – 0.9) indicates the highest possible density of green leaves.