NDVI

  Normalized Difference Vegetation Index (NDVI) quantifies vegetation by measuring the difference between near-infrared (which vegetation strongly reflects) and red light (which vegetation absorbs). It is used to measure the healthiness of vegetation. The data is available at 10 metre resolution. The NDVI values have been calculated using the following equation:

• NDVI = (NIR – RED) / (NIR + RED) 

The NDVI range is -1 to +1 and we use the NDVI colour map shown to the right of the image.