摘要
根据变差函数的随机性和空间结构性,综合利用变差函数计算方法和加权线性规划拟合方法,分别拟合出各主要方向上的模型参数,再根据各向异性情况进行结构套合,实现了变差函数的计算及球状模型的自动拟合。针对样本中存在特异值的情况,算法中还提供了相对变差函数方法,有效地抑制了特异值对变差函数的影响,保证了球状模型拟合的精度。本算法在VC++6.0中实现,利用拟合出的模型,对样本区域进行插值得到网格文件,调用Surfer8.0绘制了等值线图。通过交叉验证和综合法验证,表明拟合度较高。
In view of the randomness and spatial structure of the variogram, the authors used the integrated variogram and weighted linear programming fitting methods to fit the model parameters in the main directions. This was condueted in accordance with the structure of the anisotropy, and the variogram calculation and automatic fitting of the spherical model were realized. In order to ensure the success rate of fitting spherical model, the algorithm also provided pairwise relative variogram methods which could effectively inhibit the impact of outliers on the variogram. This algorithm was realized in VC ＋ ＋ 6.0. Using the fitted model, the authors obtained grid files by interpolation of the sample region. Cross-validation and contour map show a relatively high fitting degree.
出处
《物探与化探》
CAS
CSCD
北大核心
2010年第2期253-257,共5页
Geophysical and Geochemical Exploration
基金
国家973煤气层项目(2005CBM0801)资助
关键词
变差函数
相对变差函数
球状模型
自动拟合
线性规划
variogram
pairwise relative variogram
spherical model
automatic fitting
linear programming
