剩余地形模型的适用性分析  

Analysis on the applicability of residual terrain model

作　　者：陈良 游为 CHEN Liang;YOU Wei(Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学地球科学与环境工程学院,成都611756

出　　处：《测绘科学》2023年第8期51-56,共6页Science of Surveying and Mapping

基　　金：国家自然科学基金项目(41974013,42174014)。

摘　　要：针对剩余地形模型的适用性问题,该文根据剩余地形模型理论选择了2190阶次的Earth2014参考面模型和XGM2019e、XGM2019e_2159、EGM2008共3种地球重力场模型计算出对应剩余地形模型(RTM)高程异常。研究结果表明:①与真实高程异常扣除EGM2008对比,在高海拔地区EGM2008+RTM的均方根误差(RMSE)和平均绝对误差(MAE)精度分别提高了15.03%和26.09%,低海拔地区加入RTM高程异常后降低了4.13%和6.25%,可能是由于SRTM数据高程精度(±16m)在海拔较低的区域地形的高频信号包含的噪声较大,因此剩余地形模型对于海拔较低且高程变化不太明显的区域不适用,而对于海拔较高且高程变化较为明显区域其地形包含的高频信号大于噪声,因此剩余地形模型对于该区域适用性较强。②无论何种地形,采用XGM2019e重力场模型对高程异常求解精度要显著高于EGM2008,这是因为XGM2019e的模型阶次远大于EGM2008。In view of the applicability of the residual terrain model,according to the residual terrain model theory,the 2190 order Earth2014 reference plane model and three earth gravity field models of XGM2019e,XGM2019e_2159 and EGM2008 were selected to calculate the corresponding RTM height anomalies in this paper.The results showed that:compared with the real height anomaly deducting EGM2008,the RMSE and MAE accuracy of EGM2008+RTM in high altitude areas was improved by 15.03%and 26.09%,respectively.The addition of RTM height anomaly in low altitude area decreased by 4.13%and 6.25%,which may be due to the fact that the elevation accuracy of SRTM data(±16 m)contains more noise in the high frequency signal of topography in the lower altitude area,so the residual terrain model was not suitable for the area with lower elevation and less obvious elevation change,but for the area with higher elevation and obvious elevation change,the terrain contained more high frequency signal than noise.Therefore,the remaining terrain model was more applicable to this area.@No matter what kind of terrain,the accuracy of using XGM2019e gravity field model to solve height anomaly was significantly higher than that of EGM2008,because the model order of XGM2019e was much higher than that of EGM2008.

关 键 词：高程异常 地球重力场模型 剩余地形模型 

分 类 号：P223[天文地球—大地测量学与测量工程]