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Metcalfe et al. MNRAS 435, 1825 (2013) - has a detailed comparison of the PS1 Small Area Survey 2 data (a test 3pi region taken under optimal conditions) with SDSS. Here are plots comparing 5-sigma counts from SDSS DR8, PS1-SAS2 and Stripe 82. This is a best-case scenario. Generally speaking, averaged over the whole sky, PS1 is similar in depth to SDSS in g and r, ~0.5 deeper in i and ~1 mag deeper in z (for point sources).
PS1 data access
What should I know about the current data release?
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