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GalexView Survey Quality
madbadgalaxyman,
GALEX contains many surveys of various quality levels (or exposure depth). You can filter your search results to just the deeper surveys by clicking on the Survey Column, then select the desired survey in the histogram to the lower left:
AIS: All Sky Survey (shallowest/lowest quality)
MIS: Medium Imaging Survey
NGS: Nearby Galaxy Survey
GII: Guest Investigator Survey
DIS: Deep Sky Survey (deepest/highest quality)
The exposure time column is also an indication of the quality of the image and can be filtered as well.
You can also adjust the brightness/contrast of the loaded in the lower right imaging controls panel. (shown in the screen snap)
Since so many of the GALEX survey images (tiles) overlap the same region of the sky, identical objects are extracted from each. The AIS survey overlaps itself quite often, since it is carpeting the entire sky with a circular radius. (Think of the Olympic Rings). So when an object is selected in the result grid, the image it was extracted from is loaded into the viewer. This behavior tends to cause confusion.
I attached a screen snap demonstrating the filtering and contrast controls.
I hope this helps,
Tony Rogers
GalexView Developer
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