Table 6.

The grading decision-making of geometric features

Grading conditions	Grade	Deformation
$G_{ref}\ast b_3\le G_{tar}$	3	Serious
$G_{tar}\le G_{ref}\ast a_3$	3	Serious
$G_{ref}\ast b_2\le G_{tar}<G_{ref}\ast b_3$	2	Moderate
$G_{ref}\ast a_3<G_{tar}\le G_{ref}\ast a_2$	2	Moderate
$G_{ref}\ast b_1\le G_{tar}<G_{ref}\ast b_2$	1	Small
$G_{ref}\ast a_2<G_{tar}\le G_{ref}\ast a_1$	1	Small
$G_{ref}\ast a_1<G_{tar}<G_{ref}\ast b_1$	0	Normal