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Table 1 Shape-index ranges for each shape for 3D shape descriptors [24]

From: Three-dimensional foot shape analysis in children: a pilot analysis using three-dimensional shape descriptors

ShapeShape-index range
Spherical cup-1 to -0.875
Trough-0.875 to -0.625
Rut-0.625 to -0.375
Saddle rut-0.375 to -0.125
Saddle-0.125 to 0.125
Saddle ridge0.125 to 0.375
Ridge0.375 to 0.625
Dome0.625 to 0.875
Spherical cap0.875 to 1