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Unfortunately, physically accurate measurements of this rapidly changing illumination source are difficult to achieve, but necessary for the development of accurate physically-based sky illumination models and comparison studies of existing simulation models.<\/jats:p>\n          <jats:p>To obtain baseline data of this time-dependent anisotropic light source, we design a novel acquisition setup to simultaneously measure the comprehensive illumination properties. Our hardware design simultaneously acquires its spectral, spatial, and temporal information of the skydome. To achieve this goal, we use a custom built spectral radiance measurement scanner to measure the directional spectral radiance, a pyranometer to measure the irradiance of the entire hemisphere, and a camera to capture high-dynamic range imagery of the sky. The combination of these computer-controlled measurement devices provides a fast way to acquire accurate physical measurements of the solar\/skydome. We use the results of our measurements to evaluate many of the strengths and weaknesses of several sun-sky simulation models. We also provide a measurement dataset of sky illumination data for various clear sky conditions and an interactive visualization tool for model comparison analysis available at http:\/\/www.graphics.cornell.edu\/resources\/clearsky\/.<\/jats:p>","DOI":"10.1145\/2661229.2661259","type":"journal-article","created":{"date-parts":[[2014,11,18]],"date-time":"2014-11-18T14:21:03Z","timestamp":1416320463000},"page":"1-12","update-policy":"https:\/\/doi.org\/10.1145\/crossmark-policy","source":"Crossref","is-referenced-by-count":37,"title":["A framework for the experimental comparison of solar and skydome illumination"],"prefix":"10.1145","volume":"33","author":[{"suffix":"Jr.","given":"Joseph T.","family":"Kider","sequence":"first","affiliation":[{"name":"Cornell University"}]},{"given":"Daniel","family":"Knowlton","sequence":"additional","affiliation":[{"name":"Cornell University"}]},{"given":"Jeremy","family":"Newlin","sequence":"additional","affiliation":[{"name":"Cornell University"}]},{"given":"Yining Karl","family":"Li","sequence":"additional","affiliation":[{"name":"Cornell University"}]},{"given":"Donald P.","family":"Greenberg","sequence":"additional","affiliation":[{"name":"Cornell University"}]}],"member":"320","published-online":{"date-parts":[[2014,11,19]]},"reference":[{"key":"e_1_2_2_1_1","unstructured":"Abbot C. 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