Sky image features for Folsom, CA (lat=38.642N, lon=121.148W)

<p>This file contains features derived from sky images obtained for&nbsp;Folsom, CA (lat=38.642N, lon=121.148W).<br> The file is in comma-separated values format.</p> <p>The file has 16 columns. The first column is the timestamp in UTC in the format yyyy-mm-dd HH:MM:SS. This is the time when the image was captured.</p> <p>The other 15 columns list values for&nbsp;OPERATOR(ImageData), where OPERATOR can be:</p> <ol> <li>AVG: the average of the sky image pixels</li> <li>STD: the standard deviation</li> <li>ENT: the entropy</li> </ol> <p>The&nbsp;ImageData can be:</p> <ol> <li>R: the red color channel</li> <li>G: the green color channel</li> <li>B: the blue color channel</li> <li>RB: the Red-to-Blue ratio R/B</li> <li>NRB: the normalized&nbsp;Red-to-Blue ratio (R-B)/(R+B)</li> </ol>