The 47 deg² footprint of the ZTF camera as a HEALPix MOC, refined to a maximum level of l = 10. The left panel shows the footprint as a collection of filled polygons: each of the small filled squares is one CCD quadrant, each 2 × 2 cluster of quadrants comprise a CCD, and the 4 × 4 grid of CCDs comprise the entire focal plane. The middle panel shows the outlines of the multi-resolution HEALPix tiles that comprise the MOC. The inset panel at right shows a small portion of the MOC, with each pixel labeled with its resolution level l and its nested pixel index i.