The spatial distribution (at 0.°5 resolution) of image quality represented by the best-seeing data in the g (top), r (middle), and z band (bottom) in the Legacy Surveys DR6 and DR7 releases. The Tractor source modeling is dependent on the data with the best delivered image quality at any given location. The DECaLS survey (covering the region south of δ ∼ +34° is still incomplete, as reflected by the variable image quality in much of this region. The DR6 release of MzLS also did not include the full MzLS data set.