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+ 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: + The thumbnails are radial plots, where r for the green/left plot represents the "visibility,"and r + for the orange/right plot represents the exposure time, 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.
++ The exposure is the exposure length at a given time with the edge being the maximum exposure + time for each night. This means that the each exposure graph is scaled differently. The longer + for a night, the less images taken. +
++ We also added a moon visualizaiton along with the name of the moon on that night. + An important note is that the moon illumination will have an effect on exposure time. +
++ Low visibility and/or low exposure may indicate the presence of clouds, moonlight, or overexposure. + A way to identify a low visibility session is to look at the exposure graph during variable + exposure (which we currently use, before around June 2019, fixed exposure was used. Look at the brightness graph for clarity indication). + High variance in exposure typically implies low visibility, but constant + high exposure often means high visibility +
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