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Thumbnails

Two example plots. The left plot shows a poor session, with cloud cover and overexposure, while the right plot shows a good session with a mostly-clear sky.

Folders containing nightly FITS files are summarized by a thumbnail. This allows for at-a-glance evaluation of a session's quality.

The thumbnails are radial plots, where r represents the "visibility" and the angle represents the hour of the night. The visibility v is computed as the average intensity I in the center of every frame, subtracted from the maximum possible intensity:

v = 65535 - I

Low visibility may indicate the presence of clouds, moonlight, or overexposure.