On the production and validation of satellite based UV index maps
Abstract. This paper presents a method to calculate surface UV index maps from SEVIRI satellite images using a very simplified approach to account for clouds. We compare the resulting maps, which are produced near-real time operationally, to ground measurements from the Austrian UV network and affiliated stations. While the data agrees well for low altitude stations and in clear sky conditions, discrepancy at mountain stations and in certain cloud conditions between the map pixel and ground measurement UV indices gets higher. We discuss the sources of uncertainty in both values in detail, and highlight why a direct comparison of absolute UV index values for validating purposes is inadequate.
Viewed (geographical distribution)