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The Baryon Oscillation Spectroscopic Survey (BOSS), part of the Sloan DigitalSky Survey (SDSS) III project, has provided the largest survey of galaxyredshifts available to date, in terms of both the number of galaxy redshiftsmeasured by a single survey, and the effective cosmological volume covered. Keyto analysing the clustering of these data to provide cosmological measurementsis understanding the detailed properties of this sample. Potential issuesinclude variations in the target catalogue caused by changes either in thetargeting algorithm or properties of the data used, the pattern ofspectroscopic observations, the spatial distribution of targets for whichredshifts were not obtained, and variations in the target sky density due toobservational systematics. We document here the target selection algorithmsused to create the galaxy samples that comprise BOSS. We also present thealgorithms used to create large scale structure catalogues for the final DataRelease (DR12) samples and the associated random catalogues that quantify thesurvey mask. The algorithms are an evolution of those used by the BOSS team toconstruct catalogues from earlier data, and have been designed to accuratelyquantify the galaxy sample. The code used, designated MKSAMPLE, is releasedwith this paper.

SDSS-III Baryon Oscillation Spectroscopic Survey Data Release 12: galaxy target selection and large scale structure catalogues