Quantifying amount of sunlight falling in a region

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I am trying to objectively quantify or provide some form of indication that could point toward the amount of sunlight or solar radiation onto a DEM over a day. In my limited knowledge, the way I could perhaps use an indirect indicator would be the sky view factor (e.g. lesser SVF = lesser radiation) and perhaps topographic openness.

Anyone knows if there are any datasets (either instrumental or remotely sensed data) or derivational approaches that provides such information on the amount of sunlight received, say, by a particular location (defined by a pixel cell) throughout the entire day?



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