20230511 12274400 1.0 TRUE 1956 1956 Aerial Milwaukee County greyscale non-ortho-rectified vertical aerial photography covering Milwaukee County Wisconsin from the USDA Aerial Photography program; captured in 1956; approx. resolution 12 inches per pixel; source prints were scanned and georeferenced via third-order polynomial transformation using high-resolution ortho-rectified imagery as reference by Milwaukee County GIS & Land Information (MCLIO) staff in 2023 aerial_1956