"SD" is a theory, principles, methods and functions of several aspects of the meaning. Specific performance in the following three aspects

1. SD structural curve (Structure curve) integral calculation of the fractal dimension and dynamic validation of mineral resources reserves, from the curve of the structure function of the first letter S fractal geometry and dynamic word of the pinyin system the first letter D, so it is called "SD"
2. SD calculation course, mainly uses search progressive, taking "search" in Chinese pinyin the first letter S, taking "progressive" in Chinese pinyin first letter D, so it is called "SD"
3, SD method has audited reserves from the quantitative point of the function of taking "validation" in Chinese pinyin Initials the first letter.
SD method is a dynamic geometry and reserves audited reserve calculation method. The structure is integral method curve section.