长江科学院院报2018，Vol.35Issue(6)：122-127,6.DOI:10.11988/ckyyb.20161314
GB-SAR影像坐标到三维地形坐标转换方法
A Method of Transforming GB-SAR Image Coordinate to 3 D Terrain Coordinate
摘要
Abstract
In an attempt to improve the global accuracy and reliability of the transformation from 2D coordinates of GB-SAR images to local 3D coordinates,and to overcome the limitation of traditional similarity transformation pa-rameter estimation method,we propose to employ 3D laser scanning data to assisting the transformation of GB-SAR image coordinates.Firstly we derive the formula for calculating the scaling factor of the similarity transformation pa-rameter estimation method.Analysis results suggest that the similarity transformation method is only applicable to lo-cal areas far away from radar and small in range with no dramatic change of height relative to the radar center be-cause the calculation precision is not uniform for targets with varying relative height.We propose to provide external elevation information by 3D laser scanning technology,and subsequently transform GB-SAR image coordinates to local 3D coordinates by matching of point clouds and pixels on projection plane according to the geometric projec-tion principle of GB-SAR imaging.Finally,we verified the effectiveness of the method of transforming GB-SAR by deformation monitoring experiment on the high slope of Geheyan dam.The research result is conducive to the 3D in-terpretation and analysis of GB-SAR deformation monitoring.关键词
地基合成孔径雷达影像/干涉测量/三维激光扫描/坐标转换/缩放因子Key words
GB-SAR image/interference measurement/3D laser scanning/coordinate transformation/scaling factor分类
天文与地球科学引用本文复制引用
王鹏,邢诚..GB-SAR影像坐标到三维地形坐标转换方法[J].长江科学院院报,2018,35(6):122-127,6.基金项目
住房和城乡建设部科技计划项目(2016-K4-089) （2016-K4-089）
精密工程与工业测量国家测绘地理信息局重点实验室开放基金项目(PF2015-4,PF2015-1) （PF2015-4,PF2015-1）
苏州科技大学人才引进科研资助项目(331511202) （331511202）
