I only discovered the bizarre U.S. Survey foot after encountering it in a CAD file. I did the foot > metre conversion on an incoming imperial file and none of the resulting measurements made sense as were ‘a tiny bit out’. Turned out the file was actually created in U.S. Survey Feet, slightly different to normal ‘Feet’. The international foot is defined to be equal to exactly 0.3048 metres. United States survey foot are defined as exactly 1200⁄3937 meters, approximately 0.304800609601 metres. Now this historical unit has been discontinued: The U.S. Survey Foot Has Outlived Its Usefulness – RIP |... Read more →
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