不同地貌条件下AW3D30 DEM数据空洞修复方法的对比分析

DEM数据被广泛应用于多个领域,但生产过程中数据空洞的出现严重制约了其适用性。因此,对DEM数据空洞修复的研究至关重要。本文选择太原市4个不同地貌条件下的河谷、盆地、丘陵和山地试验区作为空洞区,利用ASTER GDEM数据和直接镶嵌法、反距离加权插值法及三角洲表面镶嵌法对AW3D30 DEM数据进行修复,对不同方法的修复效果进行对比分析。研究结果表明:在盆地区域,反距离加权插值法修复效果最好,三角洲表面镶嵌法次之,直接镶嵌法最弱;在起伏度稍大的河谷、丘陵和山地区域,三角洲表面镶嵌法的修复效果最好,空洞区域内部的纹理特征明显,空洞边缘区域过渡平滑,而反距离加权插值法最弱。

Comparison and analysis of AW3D30 DEM data void repair methods under different geomorphic conditions

DEM data is widely used in many fields, but its applicability is severely restricted by the data void in production process. Therefore, it is crucial that the research on DEM data void repair. In this paper, the experimental areas of river valleys, basins, hills and mountains under four different geomorphic conditions in Taiyuan city are selected as void areas. ASTER GDEM data and direct mosaic method, inverse distance weighted interpolation method and delta surface filled method are used to reconstruct AW3D30 DEM data, and the restoration effects of different methods are compared and analyzed. The results show that: In the region of the basin, inverse distance weighted interpolation method has the best repair effect, followed by the delta surface filled method, and the direct mosaic method is weakest. However, in the valley, hill and mountain region with larger fluctuation, the delta surface filled method has better effect, and the texture features in the cavity region are obvious, and the cavity edge region is smooth, while the inverse distance weighted interpolation method is the weakest.