supported by the National Natural Science Foundation of China (41071152);the Special Fund for Land and Resources Scientific Research in the Public Interest,China (201011006-3);the Special Fund for Agro-Scientific Research in the Public Interest,China (201103005-01-01)
The spatial interpolation for soil texture does not necessarily satisfy the constant sum and nonnegativity constraints. Meanwhile, although numeric and categorical variables have been used as auxiliary variables to im...