Which of the following measurements does NDVI utilize?

NDVI, or Normalized Difference Vegetation Index, utilizes near-infrared and red energy measurements to assess vegetation health and cover. The index leverages the fact that healthy vegetation reflects a significant amount of near-infrared light while absorbing red light for photosynthesis. This difference in reflective properties allows NDVI to produce values that indicate the presence and density of vegetation.

The calculation of NDVI involves taking the difference between the near-infrared and red wavelengths and normalizing this value to create a ratio, which ranges from -1 to 1. Healthy vegetation typically produces higher NDVI values close to 1, while barren areas and non-vegetative surfaces show lower values, approaching 0 or negative values.

This makes near-infrared and red energy the critical measurements for NDVI, providing valuable insights into environmental health, land use, and agricultural practices.