Australia NDVI .
Normalized Differential Vegetation Index, or NDVI, is one of the most successful image processing methods used to simply and quickly identify vegetated areas and their "condition," and it remains the most well-known and used index to detect live green plant canopies in multispectral remote sensing data. Typically vegetation “condition” refers to the vegetation vigor or health. .
The NDVI is calculated from the spectral reflectance measurements acquired in the red (visible) and near-infrared regions, respectively. .
In general, if there is much more reflected radiation in near-infrared wavelengths than in visible wavelengths, then the vegetation in that pixel is likely to be dense and may contain some type of forest. .
The output pixel values range from -1.0 to +1.0, with strong reflectance from vegetation being in the +0.5 to +1.0 range. In the satellite map, the yellow and green areas represent vegetation, with the green representing the most heavily (and healthy) vegetated areas…probably forest. The brown shades in the map represent sparse vegetation or very dry areas such as desert. The map represents the monthly NDVI average for October 2017 for Australia. More green should appear in the coming months as Australia transitions from spring to summer. .
Credit: Australian Bureau of Meteorology .
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