NDVI2

NDVI2 is a term used in remote sensing to refer to a second version or variant of the Normalized Difference Vegetation Index. Unlike the standard NDVI, NDVI2 is not defined by a single, universal formula; definitions vary across sensors, platforms, and software packages. In many usages, NDVI2 remains a normalized difference of two spectral bands, expressed as (BandA - BandB) / (BandA + BandB). The specific BandA and BandB selections differ by data source, leading to different numerical results even when both are called NDVI2.

Common interpretations include using a near-infrared band paired with a red band (a variant closely related to NDVI but configured for a particular sensor) or pairing a near-infrared band with red-edge or blue bands depending on the dataset. Some manufacturers label an index as NDVI2 to distinguish it from other NDVI derivatives in their software toolkits.

Purpose and interpretation: NDVI2, like NDVI, aims to indicate vegetation vigor and biomass by exploiting the contrast between absorption in red wavelengths and reflectance in the near-infrared. Values typically range from -1 to +1, with higher values indicating healthier vegetation cover. Applications include crop monitoring, forest health assessment, and land-use classification. The exact thresholds and sensitivity depend on the chosen band pair and any preprocessing steps.

Data considerations: NDVI2 requires calibrated reflectance data and ideally atmospheric correction. It is sensitive to soil brightness, sensor noise, and viewing geometry; lack of a standardized definition can complicate cross-dataset comparisons.

See also: NDVI, Enhanced Vegetation Index, vegetation indices. Notes: When using NDVI2, consult the specific data provider’s documentation for the exact formula and band references.