黑龙江流域科学资源管理

There are various geomorphic types in Heilongjiang Basin, including the Great Xing'an Mountains, the Small Xing'an Mountains, the Outer Xing'an Mountains and Changbai Mountains, the the Inner Mongolian Plateau, the Songnen Plain and the Sanjiang Plain, as well as Xingkai Lake and Beier Lake. This data is based on ASTER-DEM data, and after data denoising and reconstruction, it is divided into 7 levels according to the changes in terrain slope, namely: level 1 (0-1 degrees), level 2 (1-3 degrees), level 3 (3-7 degrees), level 4 (7-15 degrees), level 5 (15-25 degrees), level 6 (25-35 degrees), and level 7 (above 35 degrees).