If Google Maps existed in 1938…
Harrison Ryker, who studied at UC Berkeley after his time in World War I, partnered with pilots to practice his hobby of aerial photography. He later put together his own company that provided both educational and military institutions with new mapping technology.
The photographs overlap each other and cover the entire city. The resolution is generally better than one foot or even higher with high contrast features allowing visibility of even the paint striping on a basketball court. Relative heights are frequently discernible based on the shadows cast of objects and structures. A handwritten date on the index map indicates the photographs were taken in August, 1938.
You can view the interactive map here →