Observed arrival · 2026-11-06
GALFA-HI’s interactive survey atlas
An open-data interface for browsing GALFA-HI neutral-hydrogen survey maps, selecting data cubes, and building downloadable cutouts.
○Open
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$Paid
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✦Pretty
●Pro
◎Niche
◉Human
⚑Risk
ƒJS
- For
- Astronomers working with neutral-hydrogen survey data
- Worth noticing
- Adjacent cubes overlap by 32 arcminutes and agree bit-for-bit; cutouts stitch across tile boundaries and right-ascension zero without resampling.
Field notes
The interface distinguishes narrow and wide velocity coverage and exposes the cutout parameters directly: center coordinates, width, height, and lower and upper LSR velocity. The page says cube files are 1.07 GB each and stored as 16-bit integers with a stated scale factor. Column-density products are FITS images on a 1′ R.A.–Dec grid, with undefined pixels represented as NaN.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
○OpenPublic substance visible
✦PrettyNotable craft visible
●ProPolished or operationally mature
◎NicheUnusually specific use
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