摘要
数字高程模型(DEM)是GIS的基础数据之一,是许多涉及高程信息的空间分析的重要基础。DEM插值精度的好坏直接影响基于DEM的各种地学分析及应用,因此研究高精度的DEM插值算法具有重要意义。介绍了基于水文强化算法的DEM插值算法——ANUDEM,并与传统的TIN建立DEM的算法进行了比较。认为在地形复杂地区由于等高线密集,高程信息丰富,两种插值算法效果都比较好;而在地形平坦地区ANUDEM算法精度优于TINDEM,并且,ANUDEM得到的DEM很好地避免了平山顶、阶梯状地形,其派生的等高线和水系与原始数据更加吻合。相对于TINDEM算法,ANUDEM算法更适合地形平坦地区的DEM建立。
Digital Elevation Model（DEM） is one of the basic data for GIS;it is also the important basis for spatial analysis related to the elevation of the study area.The accuracy of DEM affects the result of the geoanalysis and application,so research on high accuracy of DEM interpolation algorithm will be of great importance in geoanalysis and application.A DEM interpolation algorithm-ANUDEM which is based on automatic drainage enforcement algorithm is introduced.The comparison of ANUDEM algorithm and TINDEM algorithm（i.e.traditional DEM interpolation algorithm-generating DEM from TIN） suggests that,in the rugged area,the accuracy of the two algorithms is closed,and the effect of the two DEMs is both very good.In the flat area,the accuracy of the ANUDEM algorithm is higher than TINDEM,and the DEM generated with ANUDEM algorithm avoid the flat hilltop and ladder-shaped terrain very well.The contour and the water stream derived from DEM generated by ANUDEM are fitted to the original data well.The result of this study suggests that compared to the TINDEM algorithm,the ANUDEM algorithm is more suitable for flat area DEM establishment.
出处
《测绘与空间地理信息》
2013年第7期33-37,40,共6页
Geomatics & Spatial Information Technology
基金
国家科技支撑计划项目(2012BAH28B02)
国家自然科学基金项目(40971044)
江苏高校优势学科建设工程项目(苏政办发[2010]118号)资助
