KEYWORDS: Clouds, Atmospheric modeling, Data modeling, Solar radiation models, Ultraviolet radiation, Systems modeling, Solar radiation, Reflectivity, Satellites, Ozone
At the Swedish Meteorological and Hydrological Institute (SMHI) an operational radiation model system has been set up. It produces hourly fields of global-, photosynthetically active- and CIE weighted UV-radiation with a resolution of about 22 x 22 km for a geographic area covering Scandinavia and the run off region of the Baltic sea. This paper presents the model system and its data sources together with some validation results. The model output is available on the Internet page http://www.smhi.se/strang.
In this paper learning is considered to be the bootstrapping procedure where fragmented past experience of what to do when performing well is used for generation of new responses adding more information to the system about the environment. The gained knowledge is represented by a behavior probability density function which is decomposed into a number of normal distributions using a binary tree. This tree structure is built by storing highly reinforced stimuli-response combinations, decisions, and calculating their mean decision vector and covariance matrix. Thereafter the decision space is divided, through the mean vector, into two halves along the direction of maximal data variation. The mean vector and the covariance matrix are stored in the tree node and the procedure is repeated recursively for each of the two halves of the decision space forming a binary tree with mean vectors and covariance matrices in its nodes. The tree is the systems guide to response generation. Given a stimuli the system searches for decisions likely to give a high reinforcement.
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