Digitized Sky Survey (DSS) Overview
DSS Overview DSS Data Access DSS Cutouts


The Digitized Sky Survey (DSS) is a ground-based imaging survey of the entire sky in several colors. The survey, performed with Palomar and UK Schmidt telescopes, produced photographic plates that were later digitized at the Space Telescope Science Institute (STScI) to produce the Hubble Guide Stars Catalog (GSC). Each plate produced by the Survey covers 6.5 x 6.5 degrees of the sky, and the plates have been digitized using a modified PDS microdensitometer. The digital images have a pixel size of either 25 microns (1.7 arcsec per pixel) or 15 microns (1.0 arcsec per pixel), and are 14000 x 14000 or 23040 x 23040 pixels per side. The images are stored on 12-inch optical media and are difficult to access quickly.

If you use DSS data, please cite the dataset Digital Object Identifier (DOI): 10.26131/IRSA441.

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Data Set Characteristics

Data ProductDescriptionData Access
Images UK/Schmidt E, V, J, R, N-band
Palomar/Schmidt E, V, J, R, N-band

DSS Documentation