不同DEM尺度下推方法的精度差异性分析  

Analysis of Precision Difference in DEM Scale-down Methods

作　　者：杜张颖 陈松林[2] DU Zhangying;CHEN Songlin(School of Geographical Sciences,Fujian Normal University,Fuzhou 350007,China;Fujian Provincial Key Laboratory of Subtropical Resources and Environment,Fuzhou 350007,China)

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]福建省亚热带资源与环境重点实验室,福建福州350007

出　　处：《测绘与空间地理信息》2019年第11期66-69,72,共5页Geomatics & Spatial Information Technology

基　　金：国家自然科学基金(41771136);福建省科技重大专项(2012NZ0002-1-5)资助

摘　　要：尺度问题一直是地学研究的重要内容,尺度下推对于比较和整合不同的DEM数据集,校准和验证一系列数字高程模型具有重要意义。本文以尺度下推采样方法为切入点,研究尺度变换后地表形态保真特征,进而对不同DEM尺度下推方法进行精度差异性分析。基于1∶250000 DEM数据,利用多种方法将其尺度下推到1∶50000的DEM,并根据高程变异系数和地表形态变异系数对结果进行质量评价,以此丰富地形序列图谱DEM构建过程中地形综合的程度序列,弥补尺度下推过程中地形形态保真的不足,完善尺度变换方法体系。The scale problem has always been an important part of geosciences research.It is important to compare and integrate different DEM data sets and to calibrate and validate a series of digital elevation models.Taking the scale down sampling method as the entry point,the surface shape fidelity characteristics after scale transformation are studied,and the precision difference analysis of different DEM scale down method is carried out.Based on the 1∶250000 DEM data,the scale is pushed down to 1∶50000 DEM by various methods,and the results are evaluated according to the elevation coefficient of variation and the surface morphological coefficient of variation to enrich the topographic sequence map during the DEM construction process.The comprehensive degree sequence compensates for the lack of topographical form fidelity in the scale down process and improves the scale transformation method system.

关 键 词：尺度下推 精度 地表形态特征 误差分析 

分 类 号：P216[天文地球—测绘科学与技术]