A brightness-dependent version of Tarpley's model adjusted to ground data is used with a thirteen-year GOES satellite image data bank to obtain satellite-derived monthly averages of daily global solar irradiation on a horizontal surface with 20 km spatial resolution. The estimates cover all the territory of Uruguay and neighboring areas. These results are validated against other satellite derived irradiation data and against independent long-term ground data. The comparison with the previous solar map shows that the solar irradiation is 5 - 7 % higher than previous estimates derived from long term sunshine hours observations. The first map of direct irradiation at normal incidence (DNI) for the area is also calculated, using a pre-existing global to diffuse model to separate the direct and diffuse components of hourly global irradiation.
Suárez, R. A., Abal, G., Musé, P., & Siri, R. (2014). Satellite-derived solar irradiation map for Uruguay. In Energy Procedia (Vol. 57, pp. 1237–1246). Elsevier Ltd. https://doi.org/10.1016/j.egypro.2014.10.072