Adjustment Computations: Spatial Data Analysis 4th ed. by Charles D. Ghilani and Paul R. Wolf     

Zhi‐Jun Liu 《The Professional geographer》2007,59(3):394-395

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三维地理信息数据在移动通信网络规划和优化系统中的应用     

滕艳敏 《中国地名》2007,(4)

随着移动通信的迅猛发展,网络规模不断扩大,借助数字地图,尤其是三维地理信息数据进行网络规划和优化已变得越来越重要。本文主要介绍三维地理信息数据在建立移动通信网络规划和优化系统中的应用。  相似文献   

Bayesian data fusion in a spatial prediction context: a general formulation   总被引：1，自引：1，他引：1  

P. Bogaert  D. Fasbender 《Stochastic Environmental Research and Risk Assessment (SERRA)》2007,21(6):695-709

In spite of the exponential growth in the amount of data that one may expect to provide greater modeling and predictions opportunities, the number and diversity of sources over which this information is fragmented is growing at an even faster rate. As a consequence, there is real need for methods that aim at reconciling them inside an epistemically sound theoretical framework. In a statistical spatial prediction framework, classical methods are based on a multivariate approach of the problem, at the price of strong modeling hypotheses. Though new avenues have been recently opened by focusing on the integration of uncertain data sources, to the best of our knowledges there have been no systematic attemps to explicitly account for information redundancy through a data fusion procedure. Starting from the simple concept of measurement errors, this paper proposes an approach for integrating multiple information processing as a part of the prediction process itself through a Bayesian approach. A general formulation is first proposed for deriving the prediction distribution of a continuous variable of interest at unsampled locations using on more or less uncertain (soft) information at neighboring locations. The case of multiple information is then considered, with a Bayesian solution to the problem of fusing multiple information that are provided as separate conditional probability distributions. Well-known methods and results are derived as limit cases. The convenient hypothesis of conditional independence is discussed by the light of information theory and maximum entropy principle, and a methodology is suggested for the optimal selection of the most informative subset of information, if needed. Based on a synthetic case study, an application of the methodology is presented and discussed.  相似文献   

Spheroidal oscillations of the Earth stimulated by the Sumatra-Andaman earthquake with CDSN data     

万永革盛书中  周公威郭燕平 尚丹 《地震学报(英文版)》2007,20(4):392-404

The 0S2~0S54 spheroidal modes of Earth’s free oscillations, triggered by the great Sumatra-Andaman earthquake of 26 December 2004 are retrieved from VHZ data recorded by seven upgraded stations of China Digital Seismograph Network (CDSN). We compare these spheroidal modes with theoretical free oscillation spectra calculated from the Preliminary Reference Earth Model (PREM) and find a coincidence between their periods. Spectral splitting phenomenon is observed obviously in 0S2, 0S3, 0S4, 2S1 and 1S2 free oscillation modes. What is most noticeable is that the oscillation mode 2S1 is reported for the second time (the first time by Rosat et al) without any data stacking. We simulated the split singlet of 0S2 mode on seven CDSN stations based on general focal mechanism and seismic moment of the earthquake. The result shows that seismic moment of the earthquake can reach 1023 N.m. We also find that the recording of Earth’s free oscillations carries abundant information of source mechanism and earthquake location, which is applicable to the detailed study of source rupture parameters.  相似文献   

谈网络环境下图书情报工作     

马凤霞 《山西地震》2007,(4):43-44

文中提出了在网络环境下要逐步实现图书情报的信息化、标准化、自动化和专业化。同时,图书情报工作人员要转变观念,树立新的服务理念,发挥图书情报在地震事业中的作用。  相似文献   

3D image-based characterization of fluid displacement in a Berea core     

M. Prodanović  W.B. Lindquist  R.S. Seright 《Advances in water resources》2007

Improved network flow models require the incorporation of increasingly accurate geometrical characterization of the microscale pore structure as well as greater information on fluid–fluid interaction (interfaces) at pore scales. We report on three dimensional (3D) pore scale medium characterization, absolute permeability computations for throat structures, and pore scale residual fluid distribution in a Berea core. X-ray computed microtomography combined with X-ray attenuating dopants is used to obtain 3D images of the pore network and to resolve phase distributions in the pore space.  相似文献   

再论拟准检定法的原理、实施和应用   总被引：2，自引：0，他引：2  

欧吉坤 《测绘工程》2002,11(4):3-6

综合阐述了拟准检定法的原理和特点、研究思路。拟准检定法的关键是如何正确选择拟准观测，文章介绍了初选的复选拟准观测的实施要点。列举了拟准检定法在图相关情况下的相差检测，形变分析中的异常探测以及GPS相位观测的周跳检测和修复等方面的应用例子。  相似文献   

VLBI、SLR、GPS综合数据处理方案研究   总被引：1，自引：0，他引：1  

徐天河  杨元喜 《测绘工程》2002,11(4):7-10,21

按参与平差观测值类型的选取不同，对VLBI、SLR、GPS综合处理方案进行了分类。给出了各类方案的平差模型，结合当前我国三种技术的实测情况，分析了各种方案的优缺点，提出了较为可行的综合处理方案。  相似文献   

基于矢量图形的反走样技术及其应用   总被引：2，自引：0，他引：2  

王建涛  吴官祥 《测绘学院学报》2001,18(3):229-231

介绍现行基于矢量图形反走样技术的几种实现方法，给出了一个较为适用的快速反走样算法，介绍了它的原理、算法并将它的结果在不同环境下与走样直线作了对比，最后利用它对数字地图和矢量字符进行了反走样分析。  相似文献   

ECMWF 850hPa风场对长江流域强降雨预报能力的检验          下载免费PDF全文

杨克明  陈秀凤  张守峰  林建 《气象》2001,27(4):35-37

利用ECMWF850hPa风场模式的24，48，72小时风场预报格点资料和风场实况资料，对1998年6－8月长江流域出现的13次致洪暴雨，大暴雨天气 850hPa风场和500hPa,850hPa上暴雨的影响天气系统进行了预报能力的分析检验，所得结果有利于数值预报产品的释用和实时预报业务的订正使用，以提高暴雨预报能力。  相似文献