Effective Snow Cover by VIS/IR Radiometry
Description
The combined effect, within a product resolution element, of fractional snow cover and other reflective contributors is used to estimate the fractional cover at resolution element level. The product may be processed in different ways and have different quality depending on the surface being flat, forested or mountainous. The algorithm is based on multi-channel analysis of AVHRR, the most important being those in short-wave, thus the product is generated in daylight. The deficit of brightness in respect of the maximum one is correlated to the lack of snow in the product resolution element. In the case of forests, the signal attenuation due to forest canopy obstruction is taken in to account by application of transmissivity map assembled in advance using MODIS and GlobCover land cover data. In order to search for cloud-free pixels, multi-temporal analysis is performed over all images available in 24 hours (in daylight).
Resources
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https://hsaf.meteoam.it/Products/Detail?prod=H12 |