基于SRTMv4的异龙湖流域地形因子提取

以最新SRTMv4版DEM作为基础数据,选择异龙湖流域为研究区域,利用ArcGIS 10平台中的水文分析扩展模块提取异龙湖流域的流域边界和流域水文特征两方面的流域地形因子。根据提取结果与获取到的实测数据进行有效性检验:①与实际调查数据的水系网和1∶5万水系图对照比较,发现基于SRTM DEM所提取出的流域地形因子等信息是合理有效的。②与1∶5万DEM所提取流域水网进行对比发现基于SRTM DEM所提取的数据精度较为满意,在相同河网密度情况下,基于SRTM的DEM与1∶5万DEM的水网细节表现高度一致,具有可靠性。

Extraction of Topographic Factors of Yilong Lake Watershed Based on SRTMv4 Data

Both topographic factors of the border and hydrologic characteristics of the watershed have been extracted for the research area of Yilong lake watershed with the latest version SRTMv4 DEM as the basic data,and the expansion module of hydrologic analysis in ArcGIS 10 platform has been used.Through the comparison between the analyzed results and the corresponding hydrographic data,the validation of this method has been proved：firstly,comparing to the surveyed data of river network and the maps at the scale of 1∶50000,we can see that the topographic factors of watershed extracted from SRTM DEM is reasonable and effective.Secondly,the comparison between the river networks extracted from SRTMv4 and that from the 1∶50000 scale DEM proved that the accuracy of the results based on SRTM DEM extraction is satisfactory,it is high consistent with the river network details performance in the same degree of SRTM DEM and DEM at the scale of 1∶50000,and it is reliable.