Author(s): WANG Chun, TANG Guoan, DAI Shibao, JIANG Ling, WANG Jing, Geographic Information and Tourism College, Chuzhou University, Key Laboratory of Virtual Geographic Environment, Ministry of Education, Nanjing Normal University
Pages: 1074-1079
Year: 2014 Issue:  9
Journal: Geomatics and Information Science of Wunan University
Keyword:  DEM; terrain representation error; error field; morphological accuracy; quality analysis;
Abstract: Based on the modeling of error ellipses andεerror bands,we present a model for the Et field which includes REM field and the extremum field,where Et is the DEM terrain representation error.Then,a construction method of Et field is established.Taking the terrain of plain river network,loess hill and Qinling mountains as test data,we analyze the basic characteristics of the Et field by a comparative analysis method.Experimental results show Experimental results show the conclusions as follows:(1)the Et field could reflect the spatial distribution of DEM terrain representation error intuitively and accurately and deserves to research.(2)Et is closely related to the landform complexity of the area presented by DEM and presents significant spatial structure distribution characteristics.Meanwhile,RMS of Et shows a feature of the curve with the resolution of DEM increasing.(3)As the unoptimistic accuracy of existing RMS estimation models of Et,the quantitative simulation of the regional topographic complexity should be completed scientifically and accurately at first to achieve the high-accuracy RMS estimation of Et.