20220211 13114800 1.0 TRUE 2018 Impervious Surface This is an impervious classification of the City of Ann Arbor, MI based on orthoimagery with a 6 inch spatial resolution that was collected in the 2018. The data set was created by updating the 2015 Impervious Surface classification through a process of photo interpretation and manual edits. Features were classified as impervious or water based on the 2018 imagery. City of Ann Arbor