Application of Measuring Mapping Method on Calculating Fracatal Dimension of River

The fractal dimension research on reaches of Arshi River(about 80 km),Songhua River and Nenjiang River(about 2 300 km) in Heilongjiang Province prove that we can utilize measuring mapping method to calculate the fractal dimension of random fractals under some suppositions.The research shows the fractal dimension on reaches of Arshi river((about) 80 km) is higher than that of Songhua River and Nenjiang River(about 2 300 km).Noticeably,the fractal dimension of curve must contact with yardstick variable interval,otherwise it is incomparable.Moreover,the fractal dimension of river is related not only with the yardstick,but also with the resolving power of original image before vector.