基于多源数据的中国地形海拔分级指标调整研究

Mountain Attitude Classification Indexes Adjustment Based on Multi-Source Data in China

使用SRTM DEM、土地覆被、冻融侵蚀、河流沟谷等多源数据,对区分海拔等级的指标地物作了具体分析,以指标地物的平均海拔为依据,通过分级指标对象(如冰川、林线)分布高程重合或贴近的多条等高线圈形成分级等高平面,对陆地地貌进行切割划分,用每组指标对象偏离等高平面的值作为控制量(控制点),插值重构分级参考曲面。该方案最大限度突出指标的地理意义,形成的海拔分级结果与中国地理系统分布特征更为贴近,可以为中国大尺度地貌基本形态的划分提供参考。

Because of the complicated mountain land types in China, it is often difficult for the existing moun- tain land classification indexes to take all morphogenetic zones into account. As a result, indexes lose indica- tive significance in local regions. In order to establish altitude classification indexes with clear geographical significance, the altitude characteristics of index surface features that could distinguish between mountain land level was analyzed in the paper through multi-source data, including SRTM, DEM, land cover, freeze-thaw ero- sion and river valleys. Based on the average altitude of index surface features, the classification planes with equal attitude were formed through classification index objects （such as glacier and forest line） distribution ele- vation coincidence or adjacent multi-contour line circles. Besides, the mountain land was cut and divided. The values that each group of index object deviated from the plane with equal attitude were considered as the con- trolled quantity （control points）. The classification reference surface was remonstrated via interpolation. The re- search highlighted the geographical significance of the indexes to the largest degree. The obtained results of mountain land classification was the most close to the distribution characteristics of mountain resources and en- vironment system in China. It is hoped that the research can provide basic reference for the regionalization of mountain land that is oriented from the characteristics resource distribution.