Pan-STARRS1: Galaxy Clustering in the Small Area Survey 2
  The Pan-STARRS1 survey is currently obtaining imaging in 5 bands (grizy) for
the $3\pi$ steradian survey, one of the largest optical surveys ever conducted.
The finished survey will have spatially varying depth, due to the survey
strategy. This paper presents a method to correct galaxy number counts and
galaxy clustering for this potential systematic based on a simplified signal to
noise measurement. A star and galaxy separation method calibrated using
realistic synthetic images is also presented, along with an approach to mask
bright stars. By using our techniques on a ~69 sq. degree region of science
verification data this paper shows PS1 measurements of the two point angular
correlation function as a function of apparent magnitude agree with
measurements from deeper, smaller surveys. Clustering measurements appear
reliable down to a magnitude limit of rps<22.5. Additionally, stellar
contamination and false detection issues are discussed and quantified. This
work is the second of two papers which pave the way for the exploitation of the
full $3\pi$ survey for studies of large scale structure.
