一种子像素偏移追踪算法的实例验证

Examples Vertfication for a Sub-Pixel Offset Tracking Algorithm

作为一种中强震形变场获取技术,子像素偏移追踪算法可以与InSAR、GPS等构成重要互补。验证了一种以强度互相关、双线性插值和二维高斯回归三种技术为基础的、新发展的子像素偏移追踪算法,且利用该算法求取了2014年2月新疆于田地震和2013年9月巴基斯坦地震的同震形变位移场。2014年于田地震地表破裂以左旋走滑为主,最大左旋滑移量达到1.5m。2013年巴基斯坦地震地表破裂主要表现为左旋走滑的弧形破裂,最大滑移量可达到10m。经计算得到的巴基斯坦地震同震形变位移场与前人的研究结果基本一致,精度可达到百分之三个像素水平。结果表明新发展的子像素偏移追踪算法可以有效求取中强震的同震形变位移场。

As an algorithm of calculating displacement field of moderate or strong earthquake,sub-pixel offset tracking algorithm,InSAR and GPS important complement each other.In this paper,a new developed sub-pixel offset tracking algorithm which is based on intensity correlation,bilinear interpolation and 2D Gaussian regression is verified.Using this algorithm,we calculate coseismic displacement fields of 2014 February Xinjiang Yutian earthquake and 2013 September Pakistan earthquake.The surface rupture of 2014 Yutian earthquake is mainly left-lateral strike-slip peaking to 1.5m.The surface rupture of 2013 Pakistan earthquake is purely left-lateral strike-slip peaking to 10m.The coseismic displacement field calculated by this algorithm is basically identical with previous research results.This study illustrates the new developed sub-pixel offset tracking algorithm can calculate coseismic displacement field of moderate or strong earthquake effective.