Using NDVI to assess departure from average greenness and its relation to fire business INT-GTR-333 2025

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The most common measurement is called the Normalized Difference Vegetation Index (NDVI). Very low values of NDVI (0.1 and below) correspond to barren areas of rock, sand, or snow. Moderate values represent shrub and grassland (0.2 to 0.3), while high values indicate temperate and tropical rainforests (0.6 to 0.8).
The Normalized Difference Vegetation Index (NDVI) is a measure of the amount and vigor of vegetation on the land surface and NDVI spatial composite images are developed to more easily distinguish green vegetation from bare soils.
Sparse vegetation such as shrubs and grasslands or senescing crops may result in moderate NDVI values (approximately 0.2 to 0.5). High NDVI values (approximately 0.6 to 0.9) correspond to dense vegetation such as that found in temperate and tropical forests or crops at their peak growth stage.
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These are the typical NDVI value range for each type of region: Dense vegetation - Greater than or equal to 0.6. Moderate vegetation - In the range [0.4, 0.6) Sparse vegetation - In the range [0.2 0.4)
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.
Here are some general guidelines for interpreting NDVI values: NDVI values below 0: This indicates water or other non-vegetated features. NDVI values between 0 and 0.3: This indicates barren areas with little to no vegetation cover. NDVI values between 0.3 and 0.6: This indicates areas with sparse vegetation cover.
Vegetation greenness is shown by the mean values of the monthly NDVI. Very low values (0.1) of NDVI represent the barren areas of rock, sand, or snow while moderate values (0.2 to 0.3) represent shrub and grassland and high values (0.6 to 0.8) represent temperate and tropical rainforests [13, 26].

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