摘要
为了比较研究直立长方体(Prism)模型、Tesseroid单元体模型、质量线(Line-mass)模型和质量点(Point-mass)模型等4种基于DEM(digital elevation model)重力地形改正模型的精度。通过模型分析、精度对比和数据试验等手段,基于计算距离、地形高度和DEM分辨率等因素对模型精度的影响进行了对比和研究。结果表明:距离越近,模型间相对误差越大,极近区应优先选用Prism模型;模型间相对误差随距离衰减情况受地形高度和DEM分辨率等多种因素影响;地形起伏越大,对模型的精度要求越高;DEM分辨率越高,模型精度越好;质量线模型的验算精度不及质量点模型。
In order to compare and analyze precisions of four terrain reduction models based on DEM including prism model,tesseroid model,line-mass model and point-mass model,influences of distance to computation point,terrain height and resolution of DEM to the model precision are analyzed and tested by model analysis,precision comparing and data experiment.The results indicate that relative errors between different models increase with the decreasing distance and the prism model is preferred in the near area.The attenuation laws of relative errors between different models with the increasing distance are affected by multiple factors such as terrain height and resolution of DEM.In areas with great terrain undulation’models with higher precision should be adopted.Precision of models increases with increasing DEM resolution.Data experiment shows that pointmass model is more accurate than line-mass model.
作者
黎哲君
周冬瑞
张毅
林承灏
袁泉
LI Zhejun;ZHOU Dongrui;ZHANG Yi;LIN Chenghao;YUAN Quan(Anhui Earthquake Administration,Hefei 230031;Key Laboratory of Middle-southern Segment of Tan-lu Fault Zone,Hefei 230031)
出处
《海洋测绘》
CSCD
2019年第1期1-6,共6页
Hydrographic Surveying and Charting
基金
中国地震局地震监测
预测
科研三结合课题(CEA-JC/3JH-171310)
