基于InSAR技术的淮南矿区DEM重建及精度分析

DEM reconstruction and accuracy analysis of Huainan mining area based on InSAR technology

对于易发生地表形变的区域,传统DEM模型如SRTM,逐渐失去其时效特性,不能准确的描述地质特征,亟待更新重建.本文基于合成孔径雷达干涉测量(InSAR)采用SAR影像复数据相位信息提取地面三维信息的新技术,介绍了合成孔径雷达干涉测量数字高程模型建立的原理和方法.在此基础上,选取研究区,获取了Envisat ASAR SLC雷达影像数据,采用InSAR算法对研究区的数字高程模型进行了重建.并在研究区的形变区内外分别选取控制点,对重建DEM和SRTM进行比较分析.结果表明:对于易发生形变的特殊区域,传统DEM因失去其时效性,无法准确的描述地形特征;合成孔径雷达干涉测量可以作为此类地区DEM定期重建的有效手段.最后对重建的DEM实现三维可视化,提高了读图效率和成图质量.

For regions that are prone to surface deformation,traditional DEM models such as SRTM gradually lose their timeliness characteristics,fail to accurately describe geological features,and require urgently updated.In this paper,a new technique based on Synthetic Aperture Radar Interferometry(InSAR)using SAR image phase information to extract 3 D ground information is presented,and the principle and method of establishing the digital elevation model of InSAR are introduced.Then,the Envisat ASAR SLC radar image data was obtained and the digital elevation model of the research area was reconstructed by InSAR algorithm.Based on this,the control points were selected inside and outside the deformation area of the study area,and the reconstruction DEM and SRTM were compared and analyzed.Analysis shows that traditional DEM is unable to accurately describe topographical features due to loss of timeliness in special areas that are prone to deformation,and InSAR is an effective means of periodic reconstruction of DEM in such areas.Finally,the 3 D visualization of the reconstructed DEM is realized,which improves the reading efficiency and image quality.