Use is made of the surveyors units of measurement
that define a foot as 1200 / 3937 meters.
One survey square foot is 144 / 39.37 ^ 2 meters.
Within an accuracy of (at least) 4
digits the squaresurveyor units of measurement
are the same as the international measurement units
where a square foot is (12 * .0254) ^ 2 meters.

Other measures:
A square rod (square pole or
square perch) is 272.25 square feet.
A square chain is
a tenth of an acre
(4356 square feet).

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