共查询到20条相似文献，搜索用时 15 毫秒
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Ivan I. Mueller 《Journal of Geodesy》1990,64(3):V
InformationsIAG Scientific Meetings in 1991
A. International Symposium on Applications of Geodesy to Engineering May 13–17, Stuttgart, Germany 相似文献2.
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J. Feltens 《Journal of Geodesy》2009,83(2):129-137
The vector-based algorithm to transform Cartesian (X, Y, Z ) into geodetic coordinates (, λ, h) presented by Feltens (J Geod, 2007, doi:) has been extended for triaxial ellipsoids. The extended algorithm is again based on simple formulae and has successfully
been tested for the Earth and other celestial bodies and for a wide range of positive and negative ellipsoidal heights. 相似文献
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GNSS/SINS组合导航中因姿态失准角等误差较大会引起状态误差坐标定义不一致和线性化误差较大问题,导致传统滤波和定位性能有所降低,尤其在面临较复杂的GNSS观测环境时更为显著。本文通过将姿态、速度及位置状态构造为特殊SE2(3)-EKF群元素,考虑陀螺及加速度计零偏误差,形成群-矢量混合误差模型,在此基础上设计了一种基于量测左不变的GNSS/SINS抗差滤波方法(RLIEKF),通过市区环境下存在大失准角误差和GNSS异常的车载组合导航试验,验证本文方法的优越性。试验结果表明：相对于传统EKF方法,RLIEKF方法由于在时间更新及GNSS量测更新中顾及了姿态角误差,在不同大失准角情况下仍具有较快的收敛速度,无须复杂且长时间的姿态对准步骤,较好地弥补了GNSS信号短时间缺失无法定位问题,可显著提升滤波新息精度,具备更好的抗差性能,对于复杂观测环境表现更为稳健,且计算效率相当,具备较好的工程实用价值。 相似文献
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Input/output (I/O) of geospatial raster data often becomes the bottleneck of parallel geospatial processing due to the large data size and diverse formats of raster data. The open‐source Geospatial Data Abstraction Library (GDAL), which has been widely used to access diverse formats of geospatial raster data, has been applied recently to parallel geospatial raster processing. This article first explores the efficiency and feasibility of parallel raster I/O using GDAL under three common ways of domain decomposition: row‐wise, column‐wise, and block‐wise. Experimental results show that parallel raster I/O using GDAL under column‐wise or block‐wise domain decomposition is highly inefficient and cannot achieve correct output, although GDAL performs well under row‐wise domain decomposition. The reasons for this problem with GDAL are then analyzed and a two‐phase I/O strategy is proposed, designed to overcome this problem. A data redistribution module based on the proposed I/O strategy is implemented for GDAL using a message‐passing‐interface (MPI) programming model. Experimental results show that the data redistribution module is effective. 相似文献
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此书英文版原本(Practical Map Pro-duction)系约翰·洛克斯膝(John Loxton)所著,英国约翰·怀利父子公司(JohnWiley & Sons)1980年出版;英汉对照版中文部分系由徐省三、陈宝蕙翻译,由胡毓钜校订,测绘出版社1986年4月出版。英汉两部分以版面计,共约33万字。一、作者、译者与校者作者约翰·洛克斯膝系英国皇家特许测量学会会员,早年在剑桥研究摄影测量,二次世界大战期间在巴勒斯坦和约旦从事测量工作;其后任内罗毕大学高级讲师,从事地图生产、地图应用和地图制图学的研究。他也是英国制图学会会员,中文译者徐省三、陈宝蕙都是从事测绘专业翻译三十多年的老同志,校订者胡毓钜是武汉测绘科技大学教授。 相似文献
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本刊自2000年第1期入编<中国学术期刊(光盘版)>.<中国学术期刊(光盘版)>免收作者版面费,并免费提供作者引文率统计资料.作者可通过作者所在单位设立的中国学术期刊文献检索咨询站免费查询检索本人在<光盘版>中发表文献的被引用情况,本单位未设中国学术期刊文献检索咨询站的作者,可直接向清华大学总站查询.凡本人文章不愿在<中国学术期刊(光盘版)>上刊载的作者,请在来稿上声明,该文经本刊刊载后,不再编入<中国学术期刊(光盘版)>. 相似文献
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鉴于MGM(1,n)在预测过程中,不同变量的拟合及预测残差差距较大,本文将自适应回归模型引入到不同变量的残差估计中,对整体的残差起到平滑的作用,从而抑制了残差的上扬趋势,经过实例分析,残差自适应回归MGM(1,n)的预测精度得到了明显的提高。 相似文献
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Within the confines of Earth Observation Scientific Knowledge and Technology Transfer in Hungary (EKAT) titled ESA PECS project we gained forum for utilization of our earth observation (EO) knowledge and possibility for further development of experiences. The project aims the horizontal preparation of Hungary for ESA membership – for a dynamically developing sphere in the common part of science, technology and business. For the efficient transfer and dissemination, we preconceived target groups and principles to reach main take-up points and to open new forums of information exchange. Nowadays, user-friendly service, complex supply and real-validation process all have great importance. Joining units of suitable data choice, entire ingestion–processing chains and ergonomic interfaces can only offer a timely and professional solution for the challenges of industry and business sectors. It has to be clearly seen, that information and communication technologies (ICT) and information control becomes a more and more significant part of EO services. 相似文献
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渤海近岸水体漫衰减系数Kd(490)遥感反演模型 总被引：1，自引：0，他引：1
Irrigated land is one of the most important parts in land cover classification system, but until now it has seldom been reported about extracting it from remote sensing data and monitoring its dynamic change. The existing researches are focused on the land use-cover change (LUCC) and the irrigated area mapping, so the study on extracting irrigated land is much more important. On the basis of close relationship between water deficit index (WDI) and soil water content, this paper firstly combines two neighbor NDVI and the surface-air temperature (Ts-Ta) and conforms one Vegetation Index Temperature (VIT). It makes the timely incomparable WDI comparable and then computes the change of WDI during the monitored period. Secondly it infers the change of soil water. Thirdly it removes the rainfall’s influence under some assumption and extracts the irrigated land of the survey area. Results show that comparing with census data all the deviation is below 7% in the survey area except Shanxi province, which means that the extracted results are comparable with census data. Extracted irrigated land mainly distributes around rivers, lakes, and reservoirs or on the irrigated regions and oasises. The results are consistent with the centralized region which has abundant irrigated land known before. The results are checked elementarily using TM images. All the precisions are above 70% except in Shanxi province. The precision in Xinjiang municipality is the highest. 相似文献
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FG5/232与FG5/214绝对重力观测比对(英文) 总被引：6，自引：0，他引：6
This paper introduces the comparison of absolute gravity measurements in China during 2006-2008,and analyzing the survey and comparing the results,it shows that there is no obvious system error between the gravimeter of FG5/214 and FG5/232,the surveying accuracy is very high and repetition is good,and their inner surveying accuracy is about 2-3 microGal. 相似文献