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为了保证卫星遥感影像获取地面目标区域信息的准确性,需要对影像数据进行几何校正,几何校正的精度决定着遥感图像应用的效果。常规的校正方法需要地面控制点信息,但在境外、我国西部、荒漠等这些地方很难获取控制点。针对上述问题,提出了多重观测卫星影像的无控区域网平差方法,提高无控定位的精度。与常规区域网平差不同,该方法的误差方程基于"单物方—多像方"的连接点集建立,在无控条件下误差方程能够收敛到更加精确的解。通过误差补偿模型调整每幅影像的有理函数模型系数,使得不同方向的定位误差进行抵消,从而在无控制点的条件下提高遥感影像的定位精度。首先,利用卫星影像的RPC文件和像方误差补偿模型,建立多重重叠的区域网平差模型,然后,利用共轭梯度算法迭代求解误差方程,最后调整RPC系数,提高遥感图像定位精度。通过资源三号卫星影像试验表明:多重观测区域网平差将遥感图像的平面定位精度由19.8m提高至12.9m,能够有效提高影像的几何定位精度。 相似文献
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地处四川盆地西北部的绵阳市地表形态复杂,若仅对TM遥感影像进行粗略校正势必对后续分析埋下隐患。文章采用多项几何校正方法对实验区进行几何精校正,控制点源于同期Quick Bird遥感影像,精校正的总体精度可以达到0.5个像元,可以很好的满足后续分析和研究。 相似文献
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地处四川盆地西北部的绵阳市地表形态复杂,若仅对TM遥感影像进行粗略校正势必对后续分析埋下隐患。文章采用多项几何校正方法对实验区进行几何精校正,控制点源于同期Quick Bird遥感影像,精校正的总体精度可以达到0.5个像元,可以很好的满足后续分析和研究。 相似文献
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ETM+全色波段影像的几何精校正 总被引:1,自引:0,他引:1
为确保遥感影像为森林资源调查和监测提供更好的服务,必须对影像进行图像预处理,而图像的几何校正是图像预处理中关键一步.传统的基于TM影像的几何精校正只是采用其地面分辨率为30m的波段的影像,由于分辨率不高,导致校正精度不高.介绍了一种使用ETM 影像的地面分辨率为15m的Pan波段校正,在后续处理中,用其它波段与校正后的Pan波段几何配准,从而达到几何精校正的效果.仿真试验表明,这种先校正分辨率高的影像,再配准分辨率低的影像的方法,在一定程度上提高了校正精度,降低了控制点选取的难度. 相似文献
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推扫式光学卫星遥感影像系统校正与精纠正的几何模型通常用一个二维仿射变换模型表示,系统几何校正产品和精纠正产品中仍然包含了地形起伏信息。为了对这些信息加以应用,本文仿照RFM(有理函数模型)用于辐射校正产品几何处理的思路,提出利用RFM对系统几何校正产品、精纠正产品求解RPC参数并进行三维几何处理的技术和方法。分别利用一景北京地区10m和2.5m分辨率SPOT5 HRG各级影像产品进行了正射纠正试验,利用北京地区两景异轨5m分辨率SPOT5 HRG的各级影像产品进行了立体定向试验,结果表明,各级影像产品的三维几何模型可以用三阶分母不相同的RFM替代,与直接应用辐射校正产品影像模型进行正射纠正和立体定向的精度一致。 相似文献
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《遥感技术与应用》2017,(1)
运用野外采集的GPS数据研究几何校正模型和控制点数量对4景"高分一号"高分辨率相机数据的几何校正精度影响,此项研究有利于合理使用"高分一号"卫星数据,为国产卫星数据的应用和推广起到一定的促进作用。分别运用多项式模型和有理函数模型对"高分一号"数据进行几何校正,运用事先布置好的检查点与校正后影像上的同名地物点进行精度分析,实验表明运用有理函数模型对"高分一号"数据进行几何校正会取得较好精度。分别运用25、20、15、10、5、1个和无控制点对4景"高分一号"数据进行有理函数模型的几何校正。综合考虑人力、耗时、精度等因素后得出结论:如果影像中山区不多时,运用5个控制点进行校正可以取得较好的效果,当山区比较密集时,可以适当增加控制点数量到10个。 相似文献
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基于DRG的遥感影像几何校正 总被引:1,自引:1,他引:0
几何校正是遥感影像处理的重要环节,地面控制点(GCP)的采集是影响遥感影像几何校正精度和效率的重要因素。结合SPOT5影像处理过程,比较了实际作业中几种GCP采集模式的优缺点,总结探讨了在ERDAS IMAGINE中利用DRG进行地面控制点采集的几何校正方法。 相似文献
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张涛 《计算机测量与控制》2015,23(1):86-89
为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值. 相似文献
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In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times. 相似文献
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《Information & Management》2016,53(6):787-802
Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice. 相似文献
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Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs. 相似文献
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Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel. 相似文献
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《浙江大学学报:C卷英文版》2014,(11)
正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and 相似文献
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Zhao-hui WU 《浙江大学学报:C卷英文版》2014,(10)
正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control 相似文献
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《浙江大学学报:C卷英文版》2014,(10)
正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate 相似文献
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《浙江大学学报:C卷英文版》2014,(8)
正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate 相似文献