在gis功能中存在地理坐标系转换时，需要更加精确时，提供三参数和七参数可提高精确度。-GIS functionality geographic coordinate system conversion, more precise, three-parameter and seven parameters can improve accuracy.

布尔莎模型中7个参数的求解，程序中包含了矩阵转置、矩阵相乘、矩阵求逆的类-Solving Bursa seven parameter model, the program contains a matrix transpose, matrix multiplication, matrix inversion of the class