基于遥感影像的DEM地形信息增强表达研究——以梯田DEM构建为例  

Research on the enhanced expression of DEM terrain information based on Remote Sensing image——taking terrace DEM construction as an example

作　　者：程德强[1] 赵牡丹[1] 高春留 王翊人[1] 毛文婷[1] 

机构地区：[1]西北大学城市与环境学院,西安710127

出　　处：《华中师范大学学报（自然科学版）》2016年第3期464-470,共7页Journal of Central China Normal University：Natural Sciences

基　　金：国家自然科学基金项目(41271284)

摘　　要：将遥感影像信息应用于梯田DEM构建是实现DEM地形信息增强表达的有效方式.通过RTK测量方法获取梯田实验样区实测点高程数据,构建了0.5m分辨率Hc-DEM作为对"真实地表面"的模拟.根据1∶10000国家基本比例尺地形图精度标准,基于Hc-DEM提取等高距5m等高线并插值生成5m分辨率DEM,以该数据作为基础数据分别使用快速构建方法与基于田面边界的梯田DEM构建方法进行梯田DEM构建,实现梯田信息在DEM数据上的信息强化表达.对比分析上述4种DEM数据的高程频率特征,并以Hc-DEM数据作为参照求取高程中误差,结果表明从遥感影像上获取相关梯田信息进而辅助梯田DEM表达具有可行性,基于田面边界的梯田DEM构建方法对梯田地形强化效果相对较优,该研究将为构建其他有遥感信息加入的地形信息增强DEM提供一定参考.It is effective to use Remote Sensing image information in the construction of terrace DEM for enhanced expression of terrain information.Using RTK measuring method,terrace elevation data were obtained.A ＂real surface＂of 0.5-meter resolution Hc-DEM was constructed with the help of Hutchinson interpolation method.According to national 1∶10000scale topographic map accuracy standards,a 5-meter resolution DEM was constructed based on 5 m-interval contours extracted from the Hc-DEM.Then Rapid construction and boundary-based method were utilized to establish the Terrace DEMs with data from the above 5-meter resolution DEM.The elevation frequency of different kinds of DEM was compared,and root mean square errors of elevation were calculated with the Hc-DEM data as reference.The results show that it is an effective way for expression of terrace DEM terrain information to use the information extracted from Remote Sensing images.The boundary-based terrace DEM constructing method improves terrain information more than rapid construction method.The present study will provide information for enhancing expression of DEM topographic information with Remote Sensing information.

关 键 词：梯田DEM RTK Hutchinson算法 地形信息增强 

分 类 号：P231.5[天文地球—摄影测量与遥感]