The potential of geostationary satellites for world-wide solar resource assessment is generally recognized. However, most studies evaluating the value of the satellite's approach have tended to focus on the accuracy of satellite-derived irradiance values, rather than on the strengths that satellite techniques bring to solar resource assessment. This paper presents strong evidence that, when assessed against realistic benchmarks relevant to the needs of the solar energy community, satellite-based resource assessment can provide considerably more information, more accurately than traditional approaches.
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