STScI will be performing network upgrades on the following dates:
Sat 17 Apr 2021, 7:00 AM - 2:00 PM EDT (11:00 - 18:00 UTC)
Sat 24 Apr 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
Sat 1 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
Sun 2 May 2021, 7:00 AM - 4:00 PM EDT (11:00 - 20:00 UTC)
Sat 8 May 2021, TBD
Sun 9 May 2021, TBD
Services may be unavailable or interrupted during these times.
There are two Web forms for retrieving DSS images.
Simple DSS Form and the .
The Simple DSS Form has been around nearly unchanged
since the DSS first opened in 1995, and will probably
stay that way (people seem to like it).
The offers a more sophisticated interface
that shows all the plates from which an image can be extracted,
and can extract images from specific plates.
It can also plot catalogs onto schematic plate images,
and you can navigate over a plate
by pointing and clicking.
Simple DSS Form can return images in FITS or GIF format. The
can return FITS, GIF, JPEG, inline GIF (i.e., an
image inside a page), Postscript or PDF files.
GIFs may be replaced with PNG in the future.
The default size of DSS images is 15 x 15 arcminutes.
How big a file this makes depends on the survey and the file format
you've selected. FITS images for the First Generation surveys are
about 0.5 megabytes, while GIFs will typically be less than
half that size, and
JPEGs smaller still, at a few tens of
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