该方法在数学上可对所研究的对象提供一种最佳线性无偏估计(某点处的确定值)的方法。它是考虑了信息样品的形状、大小及与待估计块段相互间的空间位置等几何特征以及品位的空间结构之后，为达到线性、无偏和最小估计方差的估计，而对每一个样品赋与一定的系数，最后　进行加权平均来估计块段品位的方法。但它仍是一种光滑的内插方法 在数据点多时，其内插的结果可信度较高 。-The method of mathematical research object to provide a best linear unbiased estimate (a point at a certain value). After it is given the information sample of the shape, size, and the blocks to be estimated between the spatial position of the geometric characteristics and taste of the spatial structure, in order to achieve linear unbiasedness and minimum estimate variance estimates, but for each sample endowed with a certain coefficient, and finally for weighting and averaging to estimate the block segment grade. But it is still a smooth interpolation methods in data points for a long time, the interpolation results are reliable.