排序方式: 共有95条查询结果,搜索用时 0 毫秒
11.
Huang Liren Zhao Chengkun Hu Huimmg Yang Guiye Cao XiangchunFirst Land Deformation Monitoring Center SSB Tianjin China Surveying Mapping Bureau of Tianjin Municipality Tianjin China 《中国地震研究》1994,(3)
In this paper,a study of the principal characteristics of the ground deformation disasters in the city of Tianjin caused by the Tangshan earthquake is based on the results from the recent remeasurements of the geodetic controlling network of Tianjin and from on-site investigations after the earthquake.These results show that only the ground deformation in the Ninghe and Hangu areas near the epicenter reflect directly the co-seismic crustal stress,while the serious ground deformation and the engineering earthquake damages in the urban districts of Tianjin are controlled to a great extent by the local engineering geological structures,showing a kind of secondary disaster.Several suggestions are also proposed in the paper concerning the counter-measures for reducing the earthquake damage in big cities. 相似文献
12.
You Lilan Liu Dajie Huang Jia'na Liu Xue Zhou KechangInstitute of Crustat Dynamics SSB Beijing China Wuhan Technical University of Surveying Mapping Wuhan China National Center for Seismic Data Inforraanon SSB Beijing China 《中国地震研究》1994,(3)
This paper makes a probe into the application of the Kalman filtering method to the data processing of across-fault measurements.On the basis of statistical regression,the mathematic and stochastic models of filtration are established by combining the regression method with Kalman filtering.In the filtering computation,not only the randomness of fault movements but also the time-dependent variation of environmental effects have been taken into consideration.By use of the adaptive filtering method,an estimation of the dynamic noise variance matrix is obtained through iteration.Models for one measuring line(leveling line or baseline),two measuring lines(both leveling lines or both baselines)and four measuring lines(two leveling lines and two baselines)are derived and established systematically.By means of these models,the data of across-fault measurements can be processed dynamically in real-time to provide the filtered values of height difference between benchmarks or baseline length at different time in 相似文献
13.
基于启发式图搜索的遥感影像道路半自动提取 总被引:10,自引:2,他引:10
启发式图搜索法用于线状目标识别的原理是:用图结构表示边缘点和边缘段,根据启发函数计算顶点权值,在图的路径上建立相应的代价函数,通过在图中搜索对应的最小代价的通道以找到最优路径。图搜索法是一种全局最优方法,它在受噪声影响较大时效果仍然较好。文中使用了启发式图搜索法(A*算法)实现了道路的半自动跟踪。它的基本思路是:首先利用自适应平滑滤波算子进行道路信息增强,然后对传统的道路数学模型进行了进一步的扩展,突出了对道路几何特性和辐射特性的描述,并依此构建图搜索的代价函数,实现了基于启发式图搜索法A*算法的道路半自动跟踪。经实验证明,该方法进行遥感影像的道路半自动提取效果较好。 相似文献
14.
虚拟实体生成技术研究 总被引:2,自引:0,他引:2
介绍了虚拟实体的定义、研究内容和一个研究实例,并指出了虚拟实体生成研究对测绘保障的意义。 相似文献
15.
基于ArcGIS Engine的地理信息数据库管理系统设计与实现 总被引:2,自引:0,他引:2
随着社会的发展,空间信息在国土、规划等各领域的应用越来越广泛,且其容量也呈几何级增长,如何安全高效地管理、分发空间数据,成为深入应用地理信息系统功能的必要前提。本文以作者实际工作为基础,介绍了利用ESRI公司最新产品ArcGIS Engine开发包设计实现地理信息数据库管理系统的具体方法。 相似文献
16.
激光雷达测量技术在地学中的若干应用 总被引:3,自引:0,他引:3
对激光雷达测量技术在全球冰川监测、局部断裂带提取、滑坡监测和稳定性评价以及海岸线提取和海岸侵蚀等方面的应用做了较为全面的综述.作为一种新型的对地观测手段,激光雷达(含星载、机载、车载和地面)的应用已经从传统的测绘扩大到包括文物保护在内的诸多其他应用领域.所综述的激光雷达技术在地学研究中的4个应用方面,是传统地学研究中与全球变化和人居环境最为密切的方向.分析表明,激光雷达技术在这些研究方向中的应用大有作为. 相似文献
17.
Geospatial Information Service Based on Digital Measurable Image——Take Image City·Wuhan as an Example 总被引:1,自引:0,他引:1
LI Deren SHEN Xin State Key Laboratory of Information Engineering in Surveying Mapping Remote Sensing Wuhan University Luoyu Road Wuhan China 《地球空间信息科学学报》2010,(2)
LBS (location-based service) is a remarkable outcome of the development from GIS to geospatial information service. Faced by the requirements of geospatial information from the masses and the opportunity provided by the next generation Internet and Web 2.0, a new model of geospatial information service based on DMI (digital measurable image) is presented. First, the concept of LBS and the opportunities of Web 2.0 are introduced, then the characteristic of DMI is discussed. Taking the Image City·Wuhan as an ... 相似文献
18.
Geodatabase版本控制原理剖析 总被引:6,自引:0,他引:6
随着地理信息系统的发展及其应用的不断扩大,多用户并发操作、长事务处理以及历史数据回溯管理成为大型空间数据库的基本要求,ESRI在面向对象地理模型(Geodatabase数据模型)中通过版本控制为空间数据库的上述要求提供了有效的解决方案。本文详细分析了Geodatabase版本控制基本原理,为建立、管理大型空间数据库以及研究开发全新面向对象空间数据库管理系统提供参考。 相似文献
19.
LI Pingxiang YU Jie BIAN FulingLI Pingxiang professor State Key Laboratory of Information Engineering in Surveying Mapping Remote Sensing Wuhan University Luoyu Road Wuhan China. 《地球空间信息科学学报》2005,8(1):23-27
1 Extraction of the steep curve mapThe steep curve is defined as connection linefrom zero cross points which are produced fromthe convolution of Laplace ( LOG) filtration toDEM. Firstly, the elevation data from DEM areprocessed with LOG convolution and zero cross.The sampling formula is 2G(i,j) =12πσ6(r2 -2σ2)e-r2/2σ2 (1)where -M≤i≤M,-M≤j≤M,r2=i2+j2; M isthe filtration radius, nearly equaling to 5.1σ2; pre diction errorσis set to 4. Suppose that e[i,j] is asmall … 相似文献
20.
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??GPS??????λ?????????У?????????????????估???????λ??????????????????????????????????????????λ????????????λ?????????????????????????????????????????????????????????伸?ι?????????????????????????????Щ??????????????????????????????????????????????????????? 相似文献