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THE COHERENCE COEFFICIENT MAP AND RESIDUE GUIDED LEAST SQUARE PHASE UNWRAPPING ALGORITHM

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Geo-Spatial Information Science 1999年第1期2卷 55-62页

作者： zhang Li Liao Mingsheng zhang zuxun zhang Yong National Laboratory for Information Engineering in Surveying Mapping and Remote Sensing WTUSM Wuhan China

The generation of high-resolution DEM from interferometric SAR has resulted in the need for accurate and efficient methods of 2-dimensional phase unwrapping. In this paper, we give a brief description of the mathematical base of phase unwrapping, and a detailed description of the unweighted and weighted least square phase unwrapping *** our algorithm combining with the weighted least square phase unwrapping guided by the branch-cuts derived from Goldstein’ s algorithm and coherence coefficient map derived from the INSAR data is provided. In our experiment we write subroutines of the Goldstein’s branch-cut algorithm,unweighted and weighted least square phase unwrapping algorithm as well as our algorithm,and construct a small experiment system to resolve the phase unwrapping problem. Finally we test our algorithm on some INSAR data. The result shows that our approach can obtain unwrapped phase correctly and efficiently.

关键词： 2-dimensional phase unwrapping interferometric SAR coherence coefficient map weighted least square phase unwrapping branch-cuts

ARC-SPLINE AND ARCLET PROCESSING

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Geo-Spatial Information Science 1998年第1期1卷 13-17页

作者： zhang zuxun[a] BAO Xiuzhi CAO Hui [a] School of Information Engineering WTUSM Wuhan China 130079

This paper presents a new spline called arc *** takes two arcsconnecting adjacent points among a sampled series,with known tangental of eachsampled *** calculation for the *** curve length and the segment-ing point co... 详细信息

关键词： arc-splines computer graphics computer-aided cartography arclet processing

HOUSE CHANGE DETECTION BASED ON DSM OF AERIAL IMAGE IN URBAN AREA

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Geo-Spatial Information Science 1999年第1期2卷 68-72页

作者： Fan Hong zhang Jianqing zhang zuxun Liu Zhifang National Laboratory for Information Engineering in Surveying Mapping and Remote Sensing WTUSM Wuhan China

The change of house often brings on the change of DSM in an area over different periods. If we can apply information of the height of houses to reinforce the house change detection, the reliability and efficiency of detection methods will be improved *** this viewpoint, a new approach taking advantage of both height data from an image pair and image data is proposed to detect the house change in urban area and is called 'data fusion technology'.

关键词： DSM change detection gradient direction histogram

THE STUDY ON AUTOMATIC REGISTRATION OF INSAR IMAGES

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Geo-Spatial Information Science 1999年第1期2卷 30-34页

作者： Liao Mingsheng zhang zuxun zhang Li zhang Jianqing National Laboratory for Information Engineering in Surverying Mapping and Remote Sensing WTUSM Wuhan China

Interferometric Synthetic Aperture Radar (InSAR) allows production of high resolution DEM and detection of small earth motions using multiple pass SAR data sets obtained by remote sensing satellite. But the whole process has not yet reached sufficient robustness to warrant automated DEM production as commonly produced by stereovision with optical images. The automatic algorithm for precision registration is one of the bottlenecks in InSAR data processing. In this paper, an automatic approach with multi-step image matching algorithm is presented. All procedures are automatically implemented. The experiment is carried out successfully with SIR-C/L-band InSAR data. The triangular piecewise rectification is also advanced in reducing local distortion between the images and processing the large scene image. The primary result has prospect in the precision registration for the repeat-track InSAR data and reveals the potential of the presented automatic strategy.

关键词： interferometry radar registration image matching

CHANGE DETECTION FROM AERIAL IMAGES ACQUIRED IN DIFFERENT DURATIONS

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Geo-Spatial Information Science 1999年第1期2卷 16-20页

作者： zhang Jianqing zhang zuxun Fang Zhen Fan Hong National Laboratory for Information Engineering in Surveying Mapping and Remote Sensing WTUSM Wuhan China

Because of quick development of cities, the update of urban GIS data is very important. Change detection is the base of automatic or semi-automatic data update. One way of change detections in urban area is based on old and new aerial images acquired in different durations. The corresponding theory and experiments are introduced and analyzed in this paper. The main procedure includes four stages. The new and old images have to be registered firstly. Then image matching, based on the maximum correlation coefficient, is performed between registered images after the low contrast areas have been removed. The regions with low matching quality are extracted as candidate changed areas. Thirdly, the Gaussian-Laplacian operator is used to detect edges in candidate changed areas on both the registered images, and the straight lines are detected by Hough transformation. Finally, the changed houses and roads can be detected on the basis of straight line matching in candidate changed areas between registered images. Some experimental results show that the method introduced in this paper is effective.

关键词： change detection aerial images urban

New Mathematical Model Based on Affine ransformation for Remote Sensing Image with High Resolution

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Geo-Spatial Information Science 2003年第1期6卷 49-53页

作者： zhang Jianqing zhang zuxun

This paper calculates the parameters of image position and orientation,proposes a mathematical model and adopts a new method with three steps of transformations based on parallel ray *** step of the model is strict,and the map function of each transformation is the first order polynomials and other simple *** final calculation of the parameters is for the linear equations with good *** a result,the problem of the relativity of image parameter calculation is solved *** experiments are carried out.

关键词： remote sensing image high resolution parameter calculation Affine transformation mathematical model

Filtering of Airborne Lidar Point Clouds for Complex Cityscapes

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Geo-Spatial Information Science 2008年第1期11卷 21-25页

作者： JIANG Jingjue zhang zuxun MING Ying School of Computer Wuhan University 129 Luoyu Road Wuhan 430079 China School of Remote Sensing and Information Engineering Wuhan University 129 Luoyu Road Wuhan 430079 China. 不详

A novel filtering algorithm for Lidar point clouds is presented, which can work well for complex cityscapes. Its main features are filtering based on raw Lidar point clouds without previous triangulation or rasterization. 3D topological relations among points are used to search edge points at the top of discontinuities, which are key information to recognize the bare earth points and building points. Experiment results show that the proposed algorithm can preserve discontinuous features in the bare earth and has no impact of size and shape of buildings.

关键词： filtering segmentation laser scanning Lidar point clouds

从数字摄影测量工作站(DPW)到数字摄影测量网格(DPGrid)

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武汉大学学报（信息科学版） 2007年第7期32卷 565-571页

作者：张祖勋武汉大学遥感信息工程学院

指出了现今的数字摄影测量工作站存在的问题,总结了当今数字摄影测量理论的发展,包括影像匹配与观测值的“独立性”原则、多基线近景摄影测量与广义点的概念。结合数字摄影测量硬件与理论的发展,引出由数字摄影测量工作站发展为数字摄... 详细信息

指出了现今的数字摄影测量工作站存在的问题,总结了当今数字摄影测量理论的发展,包括影像匹配与观测值的“独立性”原则、多基线近景摄影测量与广义点的概念。结合数字摄影测量硬件与理论的发展,引出由数字摄影测量工作站发展为数字摄影测量网格的理念,说明了数字摄影测量网格的结构、功能,包括基于刀片机的集成处理系统、基于网络的全无缝测图系统及其特点,讨论了数字摄影测量与计算机视觉的关系,介绍了数字摄影测量网格已取得的成果。

关键词：数字摄影测量工作站网格

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由数字摄影测量的发展谈信息化测绘

武汉大学学报（信息科学版） 2008年第2期33卷 111-115页

作者：张祖勋武汉大学遥感信息工程学院武汉市430079 武汉大学测绘遥感信息工程国家重点实验室武汉市430079

信息化测绘是数字化测绘发展的必然,它将从地球空间信息的采集、数据的处理、集成、管理、表达与应用、服务等各个层面影响测绘学科各个分支的发展。以数字摄影测量发展为例,就信息化测绘的内涵、发展基础、信息化测绘体系的核心、生产... 详细信息

信息化测绘是数字化测绘发展的必然,它将从地球空间信息的采集、数据的处理、集成、管理、表达与应用、服务等各个层面影响测绘学科各个分支的发展。以数字摄影测量发展为例,就信息化测绘的内涵、发展基础、信息化测绘体系的核心、生产组织关系的变化及发展动力等方面进行了深入论述。

关键词：数字摄影测量信息化测绘