The MODIS sensors aboard the twin satellites Aqua and Terra provide global coverage of earth’s surface every 1 to 2 days. MODIS’s spatial, spectral, and temporal resolution allow for imagery to be utilized for regional monitoring of vegetation, land surface temperature, and the environment. MODIS data is available for Terra (daily, 8 day, or 16 day composites), Aqua (daily, 8 day, or 16 day composites), and composite of Terra/Aqua 16 day using at surface reflectance data.
Soil Adjusted Vegetative Index (SAVI) is a vegetative index product providing a measure of vegetation viggor while correcting for influences of underlying soil. It is widely used as an indicator of plant health, vegetative cover, drought cycles etc.
SAVI is calculated using the near infrared (nir) and red bands following the equation (nir-red)/(nir+red+L)*(1+L) where L is a soil brightness correction factor which is typically 0.5 (Huete 1988; Ray 2020). This method is useful when there is sparse vegetative cover causing soil brightness to be a significant factor. This method allows comparisons of vegetation vigor over dark and light soils.
Near Infrared (NIR): 0.841-0.876 μm
Red: 0.620-0.670 μm
Period of Record
Huete, A. R. (1988) A Soil-Adjusted Vegetation Index (SAVI). Remote Sensing of Environment, vol. 25:295-309.
Ray, T.W. (Accessed July 27th, 2020). A FAQ on vegetation in remote sensing. http://www.remote-sensing.info/wp-content/uploads/2012/07/A_FAQ_on_Vegetation_in_Remote_Sensing.pdf
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