The incident shortwave solar radiation (250~3000 nm), also known as insolation, is referred to as total solar irradiance incident at Earth surface, which is an essential parameter in land surface radiation budget and many land surface process models. GLASS surface shortwave radiation product was generated with 5 km spatial resolution and 3 hours temporal resolution from multiple polar-orbiting and geostationary satellites data globally using an improved look-up table method by radiative simulation based on MODTRAN. The basic idea of this improved algorithm is to establish the relationship between the surface radiation flux and top-of-atmosphere radiance through radiation simulation The satellite data include Moderate-Resolution Imaging Spectroradiometer (MODIS), the Meteosat Second Generation (MSG) SEVIRI, the Multi-functional Transport Satellite (MTSAT)-1R, and the Geostationary Operational Environmental Satellite (GOES) Imager (East and West).

For further details please consult the publication:

Zhang, X., Liang, S., Wu, H., & Zhou, G. (2013). Mapping Global Incident Downward Shortwave Radiation and Photosynthetically Active Radiation Over Land Surfaces Using Multiple Satellite Data. Journal of Geophysical Research, Undergoing review.
Liang, S.L., Zheng, T., Liu, R.G., Fang, H.L., Tsay, S.C., & Running, S. (2006). Estimation of incident photosynthetically active radiation from Moderate Resolution Imaging Spectrometer data. Journal of Geophysical Research-Atmospheres, 111, 13

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