This data is intended as a reference material of street and alley openings, but not designed for survey, accurate positioning, or legal documents. It is created as polygon feature class, dedicated information based on field measurements, types of Right of Way, and citations of Journal of the Common Council (J.C.C.) and legal description are included. The paper maps of the Street and Alley Openings, the raster layer version of those maps (Linen Map Markup Mosaic), and the Detroit parcel layer are used as base maps to create this data.

The spatial reference is: WGS 1984 Web Mercator Auxiliary Sphere

The street and alley openings were recorded from 1831 to 2022 throughout the whole city, and it will be updated weekly. The existed and/or active street and alley openings are ready to view, the authors are working on missing and historical records.

Note: Special values within the 'Jurisdiction' field:

"2" means that the feature was approved under Wayne County or the State of Michigan jurisdiction, No City record on file.

"1" means that the feature was approved under City of Detroit jurisdiction.

"0" means the feature was approved per circuit court decision. No City record on file.