SKYSPECTRA: an opensource data package for worldwide spectral daylight

<p>SKYSPECTRA is an open-source data package comprising spectral daylight measurements collected from various sources worldwide. The dataset encompasses measurements from both long-term measurement sites and specific periods or experiments.&nbsp;</p> <h2>Terms of use</h2> <p>For use of the dataset in research cite the paper titled <strong>skyspectra: an opensource data package of worldwide spectral daylight,&nbsp;</strong>presented at the CIE conference 2023, Slovenia, September 18-20 2023. The paper details the schema of the data package and will be publicly available soon.</p> <blockquote> <p><strong>Balakrishnan, P.</strong>, Diakite-Kortlever, A., Dumortier, D., Hern&aacute;ndez-Andr&eacute;s, J., Kenny, P., Maskarenj, M., Pierson, C., Thorseth, A., Xue, P., &amp; Knoop, M. (2023). <em>SKYSPECTRA: An Opensource Data Package of Worldwide Spectral Daylight</em>. In <em>Proceedings of 30th session of CIE Conference, </em>15&ndash;23 September 2023. Ljubljana, Slovenia. DOI:10.25039/x50.2023.OP026</p> </blockquote> <div> <div> <div> <h2>Funding&nbsp;</h2> <div> <div> <div> <p>This project is funded by the European Union's Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie Individual Fellowship (grant agreement No. 101032279)</p> <h2>Data availability&nbsp;</h2> <ul> <li>Measurement data is between <code>360 nm to 800 nm</code> wavelength</li> <li>Timestamps with solar elevation angle <code>equal to or above 15 degrees</code></li> <li>Timestamps for two dates in the months of <code>March, June, September, and December</code> (when available)</li> <li>Timestamps with <code>clear and overcast sky conditions</code> (when available)</li> <li>Locations-<code>Berlin, Beijing, Granada, Singapore, Vaulx en Velin</code> (updates of other locations are ongoing)&nbsp;</li> </ul> <h2>Data structure&nbsp;</h2> <p>Measurement datasets include four data frames or tables in .csv format, each representing a distinct type of spectral daylight measurements.</p> <ul> <li><code><strong>spectral_horizontal_irradiance.csv:</strong></code> spectral irradiance measurements of global and diffuse visible radiation recorded on a horizontal plane</li> <li><code><strong>spectral_tilt_irradiance.csv:</strong> </code>spectral irradiance measurements of global and diffuse visible radiation recorded on a tilted plane (not available currently)</li> <li><code><strong>spectral_patch_radiance.csv:</strong></code> spectral radiance measurements of visible radiation from patches of sky</li> <li><strong><code>spectral_direct_irradiance.csv:</code></strong> spectral irradiance measurements of visible radiation directly from the sun</li> </ul> <p>Supplementary datasets include four data frames or tables in .csv format, each representing additional information for each measurement.&nbsp;</p> <ul> <li><code><strong>meta_location.csv:</strong></code> information about the geographical location and immediate environment of where the measurements were taken</li> <li><code><strong>meta_weather.csv:</strong></code> information on sky conditions when the measurements were taken.</li> <li><code><strong>meta_sun_positions.csv:</strong></code> information about sun angles and true solar time when the measurements were taken.</li> <li><strong><code>meta_measurement_parameters.csv:</code></strong> information about specific measurement parameters used for each measurement.</li> </ul> <h2>Data collection</h2> <p>This data package contains a subset of the worldwide spectral daylight measurements collected to explore geographic variations in daylight spectral characteristics, an ongoing effort led by the CIE Technical Committee (TC 3-60). For more information on the data collection process and the templates used refer to the paper <em>skyspectra: an opensource data package of worldwide spectral daylight </em>mentioned above.&nbsp;</p> </div> </div> </div> </div> </div> </div>