摘要
由DLG内插生成DEM是目前DEM精细化的重要手段。为探求适用不同地形区的DEM精细化内插算法,本研究通过对比分析反距离权重法(IDW)、地形强化算法(ANUDEM)和不规则三角网(TIN)法在平地、丘陵地、山地和高山地生成DEM的点位高程误差和等高线回放效果,得出了各内插算法的优劣和在不同地形条件下的适用性。并设计了一种简易的消除"平三角"的改进TIN法。结果表明:ANUDEM法和改进TIN法对各地形区都有较好的适应性,满足精度要求,改进TIN法弥补了ANUDEM法和TIN法的不足,能够较好地反映真实地貌,IDW法和TIN法精度相对较差,对细节的描述能力较弱。本研究为精细化DEM内插算法的选择提供了一定参考。
DEM generation from the inside DLG is an important means of interpolation currently DEM refinement. Interpolation algorithm to explore the application of different terrain areas DEM fine, this study analyzed the anti-distance weighting(IDW), drainage enforcement algorithm(ANUDEM) and triangulated irregular network(TIN) method in the plains, hills, mountains and alpine altitude error generated point and contour playback DEM, obtained the merits of each of the interpolation algorithm and applicability in different terrain conditions. And designed a simple elimination of improvement 'flat triangle' TIN law. The results showed that: ANUDEM method and improved method for all terrain TIN district has better adaptability to meet the accuracy requirements, improve TIN law ANUDEM up for the lack of law and TIN law, can better reflect the real topography, IDW method and TIN method accuracy is relatively poor, weak on the details of the description. This study fine within DEM interpolation algorithm provides a certain reference.
出处
《国土资源导刊》
2015年第4期79-84,共6页
Land & Resources Herald
基金
国家科技支撑计划课题(2012BAJ23B06)资助
关键词
DEM
DLG
精细化
内插算法
精度评价
地形
DEM
DLG
fine data
interpolation algorithm
accuracy assessment
terrain
