叠前双平方根算子
prestack double-square-root operator
prestack double square root operator
度平方和
sum of the squares of the degree
杜宾二阶段最小平方
Tobit two-stage least squares
迭代再加权最小平方
iterative reweighted least squares
IRLS
第二基本形式模长平方
square of length of second fundamental form
第二基本形式长度的平方
the square of the length of the second fundamental form