  We present the details of the photometric and astrometric calibration of the
Pan-STARRS1 $3\pi$ Survey. The photometric goals were to reduce the systematic
effects introduced by the camera and detectors, and to place all of the
observations onto a photometric system with consistent zero points over the
entire area surveyed, the ~30,000 square degrees north of $\delta$ = -30
degrees. The astrometric calibration compensates for similar systematic effects
so that positions, proper motions, and parallaxes are reliable as well. The
Pan-STARRS Data Release 2 (DR2) astrometry is tied to the Gaia DR1 release.
