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Returns the minimum width of a geometry, defined as the minimum distance between two parallel lines that enclose the geometry. This is the length of the shortest side of the rectangle returned by ST_MinimumWidthRectangle. For degenerate geometries like points and lines, the minimum width is 0. ST_MinimumWidth

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Signatures

ST_MinimumWidth(geom: Geometry)

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Parameters

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geom
Geometry
required
The input geometry.

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Return type

A numeric value.

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Example

For a right triangle (3-4-5), the minimum width is the altitude to the hypotenuse (~2.57), which is narrower than the shortest side (3): 
SELECT ST_MinimumWidth(ST_GeomFromWKT('POLYGON ((0 0, 5 0, 0 3, 0 0))'))

2.5724786474424154