用MATLAB.实现3维数据立体图，是拟合的图形。,Using MATLAB. The realization of 3-D three-dimensional map data is the fitting graphics.

BEMD利用extrema2寻求曲面极值和gridfit曲面拟合函数实现包络面的获取(BEMD uses extrema2 to seek surface extreme value and gridfit surface fitting function to achieve envelope surface acquisition)