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IMU/DGPS辅助大比例尺航空摄影检效场布设的研究 总被引:1,自引:0,他引:1
在IMU/DGPS辅助航空摄影飞行时,需要同时飞行检校场,检校场的作用、飞行频率、飞行中的注意事项经国内外广大学者专家研讨已基本成为定论.通过检板场作用并结合实验数据探讨切合实际作业检校场的布设方案及实测方法. 相似文献
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针对光学测绘卫星地面检校场地物几何和辐射参数的高精度、大范围、实时同步测量需求,文章分析了几何标志点定位、地物辐射特性、大气特性等地面测量的主要任务和作用,提出了集几何和辐射于一体的地面检校场综合测量方法,设计了贯穿卫星过境前、中、后全过程的地面检校场几何辐射测量技术流程,采用RTK GPS测量、自动气象站、太阳辐射计等多种仪器设备,实现了对靶标地物的精确放样布设、标志点的几何定位、大气特性与地物特性参数等测量。经资源三号卫星几何辐射检校试验结果验证,达到了光学立体卫星几何辐射检校场地物测量的技术要求,对提高测绘遥感卫星的几何和辐射质量以及定量化应用水平具有参考作用。 相似文献
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POS辅助光束法区域网平差 总被引:10,自引:3,他引:10
介绍POS数据与摄影测量观测值联合平差的基本原理,推导了平差基础误差方程,并利用自行研制的POS辅助光束法区域网平差系统WuCAPS对摄自两个平坦地区的1:2 500和1:60 000比例尺两种航摄影像进行了试验.结果表明,利用POS系统测定的未检校与经检校场检校后的影像定向参数辅助光束法区域网平差的结果基本是一致的.此时,仅需在区域四角各布设1个平高地面控制点就能满足航空摄影测量加密的精度要求,这不但减少摄影测量加密野外像片控制点的联测工作量,而且避免了使用POS系统时必须设置专门检校场的繁琐检校,可以明显提高航空摄影效率,节省POS使用成本,有利于POS系统的大规模推广应用. 相似文献
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随着LiDAR技术的运用领域日益广泛,决定其所获取的点云数据精度的检校技术研究也显得越来越重要。本文通过项目的具体试验数据,对LiDAR检校场布设及整个航迹解算和激光检校过程进行较为详尽的探讨。 相似文献
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王继承 《测绘与空间地理信息》2015,(4):147-149
详细介绍了徕卡ALS70机载激光扫描系统的检校原理、检校厂布设原理以及检校方法,并以台安县作为检校场地进行检校实验,检校后,台安县120 km2的0.7 m点间距的点云数据精度完全符合我国相关技术要求规定,证明了该检校场地布设和检校方法是安全可靠的,是可以大范围地应用在点云数据检校生产当中。 相似文献
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以乌拉盖测区为例,介绍了IMU-DGPS技术方案的设计过程,并详细讨论了地面基站、检校场、地标点和精度验证区的布设方案,并对其中需要注意的地方进行了总结。 相似文献
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Monitoring GOCE gradiometer calibration parameters using accelerometer and star sensor data: methodology and first results 总被引:3,自引:1,他引:2
Christian Siemes Roger Haagmans Michael Kern Gernot Plank Rune Floberghagen 《Journal of Geodesy》2012,86(8):629-645
The Gravity field and steady-state Ocean Circulation Explorer (GOCE) satellite, launched on 17 March 2009, is designed to measure the Earth’s mean gravity field with unprecedented accuracy at spatial resolutions down to 100?km. The accurate calibration of the gravity gradiometer on-board GOCE is of utmost importance for achieving the mission goals. ESA’s baseline method for the calibration uses star sensor and accelerometer data of a dedicated calibration procedure, which is executed every 2?months. In this paper, we describe a method for monitoring the evolution of calibration parameter during that time. The method works with star sensor and accelerometer data and does not require gravity field models, which distinguishes it from other existing methods. We present time series of calibration parameters estimated from GOCE data from 1 November 2009 to 17 May 2010. The time series confirm drifts in the calibration parameters that are present in the results of other methods, including ESA’s baseline method. Although these drifts are very small, they degrade the gravity gradients, leading to the conclusion that the calibration parameters of the ESA’s baseline method need to be linearly interpolated. Further, we find a correction of ?36 × 10?6 for one calibration parameter (in-line differential scale factor of the cross-track gradiometer arm), which improves the gravity gradient performance. The results are validated by investigating the trace of the calibrated gravity gradients and comparing calibrated gravity gradients with reference gradients computed along the GOCE orbit using the ITG-Grace-2010s gravity field model. 相似文献
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HJ-1B B08 在轨星上定标有效波段宽度计算的查找表法 总被引:1,自引:0,他引:1
通过构建适用于HJ-1B 热红外通道(IRSB08)特性的有效波段宽度计算方法, 提高HJ-1B B08 在轨星上绝
对辐射定标的精度。根据HJ-1B 星上定标原理、利用卫星发射前地面实验数据和Planck 方程, 建立基于定标黑体
温度的有效波段宽度计算的查找表法, 结果表明查找表法得到的有效波段宽度为2.01 ?m 左右, 介于半高宽法
1.940 ?m 和矩方法2.394 ?m 之间, 且与定标黑体温度的关联性很小, 在低温点和高温点之间的相对差异在0.3%以
内。半高宽法和矩方法分别低估和高估有效 相似文献
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David Forrest 《The Cartographic journal》2013,50(3):213-214
In recent years, the concepts of usability, user experience, and user-centricity have gained in interest. Digital applications, developed in line with criteria related to these approaches, ask for a deeper understanding of users and their requirements. But, even though there is a wide range of methods available, the creation of user-centric applications with good usability and user experience still poses great challenges for developers. This is also true for web maps, i.e. web map applications, which today are ubiquitous on the Internet. They have evolved into an important information and communication tool and address users who do not possess any specific knowledge of Geoinformatics (GI) or Cartography. Despite the efforts made to meet the requirements and preferences of laymen, these users still often face problems when dealing with web map applications. This refers to aspects of design, content, and functionality. Here, participatory design, which is well-known in the field of Software and Web Engineering, might provide a suitable means. By engaging users directly and actively in the application development process, developers are able to gain a profound understanding of the users and their needs. However, there are several open questions regarding the use of participatory design for designing and implementing web map applications: What does the use of participatory design in web map development processes look like in detail? How and to what degree can users be involved in the development processes? Which added values exist? These questions are addressed by the project YouthMap 5020, whose main goal it was to create a prototype youth-centric web map for the Austrian city of Salzburg (zip code 5020). Applying the approach of participatory design, about 120 teenage pupils from several local schools were involved in all kinds of tasks related to the phases of generating the youth-centric Salzburg web city map. Experience and knowledge gained thereby allowed elaborating recommendations generally useful for generating youth-centric web map applications. 相似文献
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Markus Rothacher 《GPS Solutions》2001,4(4):55-60
Three major GPS antenna calibration methods are available toda: the relative field calibrations using the GPS data collected
on short baselines, the absolute field calibrations, where the GPS antenna is rotated and tilted by a robot, and calibration
measurements in an anechoic chamber. Mean antenna offsets and the elevation-dependent phase center variations of GPS antennas
determined by all three techniques are compared to assess their accuracy. The analysis of global GPS data with these sets
of calibration values reveals that the offsets and variations of the satellite antenna phase centers have to be considered,
too, to obtain a consistent picture. ? 2001 John Wiley & Sons, Inc. 相似文献
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地面成像光谱辐射测量系统及其应用 总被引:2,自引:1,他引:1
系统介绍了自主研制的基于制冷面阵CCD地面成像光谱辐射测量系统(field Imaging spectrometer system,FISS)的成像原理,结构设计,主要指标参数和数据处理流程等。利用室内布设的精确标志点和野外测量数据纠正了FISS系统几何畸变;利用自行开发的光谱定标软件对FISS系统进行波长定标,确定了各通道中心波长和全波半高宽;在室内,以积分球为光源,对FISS系统逐波段进行了绝对辐射定标,定标精度优于5%,并建立了各种测量条件下绝对辐射定标系数查找表;最后,利用FISS系统样机进行了大量室内和野外测量实验,并基于获取的部分数据做了作物-杂草识别、近海岸海洋环境试验、牛奶品种识别和植物生化参量反演等研究。研究结果表明,FISS系统能够成功地用于上述领域的研究,并在地质、食品、农业、林业和城市等领域也具有强大的应用潜力。 相似文献
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高分六号宽幅相机在轨几何定标及精度验证 总被引:1,自引:0,他引:1
高分六号宽幅相机能够实现单相机成像幅宽优于800 km,对大尺度地表观测和环境监测具有独特优势。在轨几何定标是光学遥感卫星几何处理的关键环节,直接影响影像的几何质量。本文充分考虑高分六号宽幅相机超大视场的畸变特性以及多谱段的成像特点,提出宽幅相机在轨几何定标方法,采用基于探元指向角的几何定标模型补偿宽幅相机系统误差,通过绝对定标和相对定标方法联合估计各波段的内外定标参数。利用Landsat 8影像、资源三号DSM为参考数据,对宽幅相机进行绝对定标处理,再利用ASTER GDEM为参考数据进行相对定标处理,其几何定标结果表明,高分六号宽幅影像绝对定位精度在3像素左右,内部几何精度能稳定在1像素,且波段间配准精度在0.3像素以内,表明在轨几何定标后高分六号宽幅影像几何质量得到了明显的提升。 相似文献