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

发布时间：2018-08-12 15:43

【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.
[Abstract]:The application of remote sensing image information to terrace DEM construction is an effective way to enhance the expression of DEM topographic information. The measured point elevation data of terrace experimental sample area are obtained by RTK measurement method, and 0.5m resolution Hc-DEM is constructed as the simulation of "real surface". According to the accuracy standard of 1:10000 national basic scale topographic map, based on Hc-DEM. The terrace DEM is constructed by using the fast construction method and the terrace DEM construction method based on the field boundary. The terrace information is enhanced on the DEM data. The elevation frequency characteristics of the above four DEM data are compared and analyzed, and Hc is used as the basis data. The results show that it is feasible to obtain terrace information from remote sensing images and then assist terrace DEM expression. Terrace DEM construction method based on field boundary has relatively better effect on terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace terrace For certain reference.
【作者单位】：西北大学城市与环境学院;
【基金】：国家自然科学基金项目(41271284)
【分类号】：P217

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