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. 2019 Feb 4;9:1391. doi: 10.1038/s41598-018-37817-8

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Imaging data for LakeLab, Lake Stechlin Germany. The upper row (a,b) shows all-sky RGB images for (a) a clear sky on August 11th 2016 at 01:29 local time and (b) an overcast sky on August 12th 2016 at 01:27 local time local time. The colored segments are analyzed in more detail in subsection Fig. 2. The middle row (c–e) shows all-sky luminance maps calculated from the RGB images for (c) a clear night and (d) an overcast night. The right hand luminance map (e) shows the difference between the two nights obtained from subtracting images. The lower row (f–h) shows all-sky CCT maps calculated from for (f) a clear night and (g) an overcast night. The right hand CCT map (h) shows the difference between the two nights obtained from subtracting clear night data from the cloudy night data.