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在InSAR大气延迟改正双差模型的基础上,推导了适用于三归法D-InSAR测量的大气延迟改正模型。利用新西兰GEONET北岛连续观测GPS数据,研究了多雨山区InSAR对流层延迟内插模型。 相似文献
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InSAR大气水汽改正模型的比较应用研究 总被引:3,自引:1,他引:2
对基于GPS数据的大气水汽扰动模型(GPS topography-dependent turbulence model,GTTM)和GPS/MODIS集成的大气水汽改正模型进行了比较研究.试验证明,GTTM模型和GPS/MODIS集成模型的改正方法都可以大大降低大气水汽对InSAR测量地面形变量精度的影响.另外,当两种模型都用于改正InSAR观测值时,它们具有很强的互补性. 相似文献
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不同空间插值对InSAR大气延迟改正影响研究 总被引:2,自引:0,他引:2
大气效应是InSAR技术用于地表探测的主要误差源之一。GPS数据作为InSAR大气延迟误差改正的重要数据源,受其站点分布疏密的影响,分辨率还无法做到与SAR影像完全相匹配,必须对GPS获取的大气延迟数据进行空间插值。本文采用反距离加权法(IDW)、Kriging插值法和移动曲面拟合法(Surface Moving Fitting,SMF)三种插值方法,探讨了InSAR大气误差改正过程中的空间插值问题,并对三种插值的精度进行了分析和评价。 相似文献
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介绍了国际上InSAR观测值大气改正方法最新的研究进展,应用实例证明了由于大气(尤其是水汽)的影响,传统的InSAR形变量的监测精度往往只能限制在cm级;而利用GPS数据,通过基于地形的GPS扰动模型(GTTM),大幅度削弱了大气对干涉影像的影响,并成功地探测出了美国洛杉矾地区明显的季节性地表形变,形变量精度可提高到5mm左右。通过与GPS/MODIS集成大气改正模型的结果的比较表明,GTTM和GPS/MODIS两种大气改正模型在削弱InSAR观测值大气水汽影响方面具有很强的互补性。 相似文献
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基于GPS观测量的InSAR干涉图中对流层改正方法及其论证 总被引:3,自引:0,他引:3
利用一种站间和历元间的双差算法来计算InSAR结果的大气改正量.为了逐像素改正InSAR结果,引入自适应参数的支持向量机(SVM),利用稀疏的GPS站网上所获得的大气改正值回归估计未知像元上的对流层改正值.采用南加州GPS集成网络(SCIGN)数据验证了该方法的可行性. 相似文献
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《武汉大学学报(信息科学版)》2020,(6)
近年来,宽幅合成孔径雷达干涉测量(interferometric synthetic aperture radar, InSAR)技术已被广泛用于地质灾害普查、地壳形变监测等方面,但对流层相位延迟影响极大限制了大范围、缓慢构造形变监测的精度。以覆盖地形起伏强烈的阿尔金断裂带西段的两类宽幅InSAR时间序列为例,分析了欧洲中期天气预报中心(European Centre for Medium-Range Weather Forecasts, ECMWF)、InSAR通用型大气改正在线服务(generic atmospheric correction online service for InSAR, GACOS)、地形相关线性模型这3类方法对大尺度对流层延迟的改正效果。结果表明,经GACOS改正后的Envisat ASAR与Sentinel-1宽幅InSAR干涉图序列的相位标准差均值削减量分别可达68.1%和54.5%,整体优于ECMWF和地形相关线性改正方法,能够为国内外InSAR用户开展宽幅InSAR大范围地质灾害监测等应用提供关键可靠的支持。 相似文献
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GPS与InSAR数据融合方法及其应用 总被引:2,自引:0,他引:2
应用GPS—InSAR集成技术监测地表形变是目前地学界研究的热点问题。介绍了利用GPS对InSAR进行大气误差和轨道误差改正的方法,探讨了GPS与InSAR数据融合的方案,并通过一个实例证明:应用GPS—InSAR集成技术可以达到毫米级监测精度,其具有十分广阔的应用前景。 相似文献
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遥感变化检测技术方法综述 总被引:1,自引:0,他引:1
遥感变化检测技术是当今遥感技术研究的热点问题之一,现有遥感变化检测技术方法很多,其分类方式也很多。本文在总结已有的变化检测方法的基础上,将变化检测方法分类为仅基于光谱的变化检测方法和结合辅助知识的变化检测方法。 相似文献
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半变异函数的获取既有人为主观求取法,又有运用数学工具客观求取法,但是后者是今后的主要趋势。笔者在前人工作的基础上,归纳出多项式回归法、线性规划法和目标规划法三种求解半变异函数的成熟方法,以及非线性回归理论直接求解法、进化计算和积分面积三种新兴方法,并总结出各种方法的优缺点。最后概括出计算权重的两种方法。 相似文献
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尺度效应是地理科学中普遍存在的现象,制约着遥感等空间科学的发展。发展合理的尺度转换方法以促进遥感技术的全面应用迫在眉睫。本文分别从面—面升尺度转换、点—面升尺度转换两个角度对目前定量遥感领域存在的升尺度转换方法进行综述。其中,面—面升尺度转换方法按照转换原理可分为先反演后聚合、先聚合后反演两种;点—面升尺度转换方法依据定权策略可分为简单平均法、经验回归法、地统计方法、贝叶斯方法等。不同的升尺度转换方法具有各自的特点和优势,本文分别从模型构架、基本原理、特点、局限性和适用条件等方面对现有升尺度转换方法进行分析和讨论,并从离散型与连续型、统计型与物理型、普适型与针对型以及先验知识有和无4个方面总结了现有研究中存在的不足,剖析了升尺度转换研究中存在的问题与挑战,并预测了可能的发展方向。 相似文献
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The determination of the attitude, the position and the intrinsic geometric characteristics of the camera is recognised as the fundamental photogrammetric problem. It can be summarised as the determination of camera interior and exterior orientation parameters, as well as the determination of 3D coordinates of object points. The term "exterior orientation"of an image refers to its position and orientation related to an exterior (object space) coordinate system. Several methods can be applied to determine the parameters of the orientation of one, two or more photos. The orientation can be processed in steps (as relative and absolute orientation) but simultaneous methods (such as bundle adjustments) are now available in many software packages. Several methods have also been developed for the orientation of single images. They are based in general on geometric and topological characteristics of imaged objects.
This paper presents a survey of classical and modern methods for the determination of the exterior parameters in photogrammetry, some of which are available as software packages (with practical examples) on the Internet. The methods presented are classified in three principal groups. In the first, a selection of approximate methods for applications that do not require great accuracy is presented. Such methods are also used to calculate values required for iterative processes. In the second group, standard point–based methods derived from collinearity, coplanarity or coangularity conditions are briefly reviewed, followed by line–based approaches. The third group represents orientation methods based on constraints and on concepts of projective geometry, which are becoming of increasing interest for photogrammetrists. In the last section, the paper gives a summary of existing strategies for automatic exterior orientation in aerial photogrammetry. 相似文献
This paper presents a survey of classical and modern methods for the determination of the exterior parameters in photogrammetry, some of which are available as software packages (with practical examples) on the Internet. The methods presented are classified in three principal groups. In the first, a selection of approximate methods for applications that do not require great accuracy is presented. Such methods are also used to calculate values required for iterative processes. In the second group, standard point–based methods derived from collinearity, coplanarity or coangularity conditions are briefly reviewed, followed by line–based approaches. The third group represents orientation methods based on constraints and on concepts of projective geometry, which are becoming of increasing interest for photogrammetrists. In the last section, the paper gives a summary of existing strategies for automatic exterior orientation in aerial photogrammetry. 相似文献
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Several problems are encountered when collecting traffic information by conventional methods and which leave scope for the development of more comprehensive techniques. This paper reviews the potential of different types of photography as an effective means of obtaining comprehensive traffic information. Comparisons between conventional methods and photographic methods are made. The different types of available photography are discussed, together with their uses in the field of traffic data acquisition. Finally, the paper assesses the use of automatic and semiautomatic methods of photographic data analysis in this context. 相似文献
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旱情遥感监测研究进展与应用案例分析 总被引:3,自引:2,他引:1
在大范围、长时序的旱情监测中,遥感技术以其快速、经济和大空间范围获取的特点,弥补了基于台站气象数据旱情监测的不足,为防旱和抗旱决策提供了实时、动态、宏观的辅助决策数据。本文对已有旱情遥感监测方法进行分析和整理,将其总结为基于土壤热惯量、基于土壤波谱特征、基于蒸散模型和基于植被指数的旱情监测方法,并对各类方法从监测原理、适用范围和应用进展等方面进行了阐述。在此基础之上,详细介绍一种结合了全球植被水分指数和短波角度归一化指数的优势建立的旱情遥感监测模型和方法。以2010年春季西南地区旱情为应用案例,从监测模型方法、数据处理流程和应用分析等方面,介绍一种基于植被水分指数的旱情监测方法,并对其监测结果进行统计分析与评价。 相似文献