20220502 10171600 1.0 TRUE greyscale non-ortho-rectifed vertical aerial photography covering Milwaukee County Wisconsin; captured July 1937; resolution is 36 inches per pixel; source 9 inch x 7 inch 1:20,000 prints were scanned at 600 pixels per inch and georeferenced via third-order polynomial transformation using high-resolution ortho-rectifed imagery as reference 1937 aerial Milwaukee County Wisconsin USA imagery historical greyscale non-ortho-rectifed vertical aerial photography covering Milwaukee County Wisconsin; captured July 1937; resolution is 36 inches per pixel; source 9... Milwaukee County GIS & Land Information, US Dept. of Agriculture (USDA) this historical imagery does not reflect current ground conditions and must not be used as a substitute for site investigation - additionally, it is not ortho-rectified and lacks the spatial accuracy inherent in ortho-rectified imagery aerial_1937 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