信息数字化在地震预测中的应用研究     

陈刚毅  陆雅君  徐水森  黄闻  欧阳首承 《四川地震》2011,(3):1-8

鉴于地震是变化事件而展示信息变化的过程性,本工作对＂5.12＂汶川8.0级地震和2011年3月23日茂县4.0级地震相继按地热的变化信息和＂时序性＂变化信息进行了数字化分析。分析结果表明,应用此方法展示了地震前后信息变化的过程性（演变）的特征（差异性）,为改善地震预测或预防提供了一种方法,同时＂地热＂可以作为地震分析、...  相似文献   

无人艇载雷达视频无线传输技术研究     

阴启玉  韩昱 《南京气象学院学报》2020,12(5):563-568

雷达视频数据量大,更新频率高,传输带宽占用量大.无人艇（USV）岸艇数据传输带宽有限,传输信息种类多、数量大.在无人艇使用过程中,雷达视频是岸基操作人员安全航行保障、交战对象搜索确认等不可或缺的支持信息,然而岸艇数据互通带宽资源的紧缺和雷达视频的大信息传输需求之间的矛盾必然存在.本文根据雷达探测成像原理,对雷达视频进行数字化表示,经压缩、数据传输和复原显示,实现无人艇岸基控制站对艇载雷达视频的还原显示.该技术在某型USV控制系统中的应用结果表明：视频压缩比高、处理时延低、视频还原完整、容错性好.  相似文献   

地质资料数字化工作方案研究     

温雪茹  郭斯嘉  刘冰 《地质与资源》2021,30(4):512-516

对地质资料数字化的整体流程和技术要求进行了全面梳理,便于读者更加精准、科学地组织工作.对数据化趋势和数据化方法的简要分析更加明确了地质资料管理的努力方向.在信息化的大背景下,数字化进而数据化是地质资料管理的必然趋势,能帮助我们更加智能、高效地把地质研究成果提供给社会服务.  相似文献   

The scheme for the database building and updating of 1∶10 000 digital elevation models     

Zhu Qing  Li Zhilin  Gong Jianya  Sui Haigang 《地球空间信息科学学报》2013,16(2):19-25

The National Bureau of Surveying and Mapping of China has planned to speed up the development of spatial data infrastructure (SDI) in the coming few years. This SDI consists of four types of digital products, i. e., digital orthophotos, digital elevation models, digital line graphs and digital raster graphs. For the DEM, a scheme for the database building and updating of 1∶10 000 digital elevation models has been proposed and some experimental tests have also been accomplished. This paper describes the theoretical (and/or technical) background and reports some of the experimental results to support the scheme. Various aspects of the scheme such as accuracy, data sources, data sampling spatial resolution, terrain modeling, data organization, etc are discussed.  相似文献   

Error model of curves in GIS and digitization experiment     

Guo Tongde  Wang Jiayao  Wang Guangxia 《地球空间信息科学学报》2013,16(4):306-310

A stochastic error process of curves is proposed as the error model to describe the errors of curves in GIS. In terms of the stochastic process, four characteristics concerning the local error of curves, namely, mean error function, standard error function, absolute error function, and the correlation function of errors, are put forward. The total error of a curve is expressed by a mean square integral of the stochastic error process. The probabilistic meanings and geometric meanings of the characteristics mentioned above are also discussed. A scan digitization experiment is designed to check the efficiency of the model. In the experiment, a piece of contour line is digitized for more than 100 times and lots of sample functions are derived from the experiment. Finally, all the error characteristics are estimated, on the basis of sample functions. The experiment results show that the systematic error in digitized map data is not negligible, and the errors of points on curves are chiefly dependent on the curvature and the concavity of the curves.  相似文献   

基于CASS的Google Earth图像处理及信息提取     

郑平元  杨武年  余代俊 《地理空间信息》2012,(2):166-167,173

Google Earth图像以精度高、直观形象、操作简单和免费使用等特点,深受广大用户的喜爱。以成都理工大学为例,探讨了利用Google Earth图像,结合CASS强大的制图功能,进行图像处理及信息提取的过程;针对GoogleEarth图像上被阴影遮蔽的信息,提出了通过地面少量实测来弥补的解决办法;最后分析了Google Earth产品的优缺点及应用前景。  相似文献   

Source Parameters of Old Earthquakes: Semi-Automatic Digitization of Analog Records and Seismic Moment Assessment     

P. Teves-Costa  J. F. Borges  I. Rio  R. Ribeiro  C. Marreiros 《Natural Hazards》1999,19(2-3):205-220

Recovering seismic information contained in old analog records could increase our knowledge of seismic source characteristics and the seismicity of a region. This is particularly important in zones with low to moderate seismicity.To extract the available information, it is necessary to digitize the seismic records. This is not an easy task especially owing to the generally poor quality of the original records, with illegible or missing parts. However some exceptions were found in the records of a few seismological stations in Germany, Sweden and France.This paper presents an example of the recovering of source parameters and can be divided in two parts: the first one presents a simple semi-automatic technique for digitization of old analog seismic records, developed using commercial software on a PC; the second part describes the methodology of assessing the seismic moment, using empirical and theoretical relations, as well as the seismic source dimensions.The earthquake selected to illustrate this procedure is the 23 April 1909 Benavente (Portugal) earthquake. This earthquake occurred in the Lower Tagus Valley region and caused great destruction in the meizoseismal area. It is the biggest earthquake that occurred during this century in the central part of the country and its magnitude has been estimated between 6.6 and 7.6.The digitization procedure allowed the recovery of seismic information contained in old analog records, in particular, the seismic moment estimation. The results obtained indicated that 7.6 was a very high value for the magnitude of the 23 April 1909 earthquake, suggesting that the magnitude reported in the Portuguese catalogue is overestimated. The estimated moment magnitude is 6.0.  相似文献   

<省级航磁数据库>航磁模拟资料数字化方法     

蒋春艳 《物探与化探》1999,(1):2

建立“省级航磁数据库”是地调局下达的项目,为保证提供合格的建库数据,针对大量存在的航磁模拟资料,航空物探遥感中心通过试验总结,提出了在航磁ΔＴ剖面厘米底图上,采用数字化仪进行数字化的方法、流程和质量检查要求,完成了航空物探遥感中心拥有的１３８个测区的航磁模拟资料数字化工作,取得了全国绝大多数地区的入库航磁数据。同时该方法已向有关地勘单位推广使用。  相似文献   

中比例尺地形图数字化方法研究   总被引：3，自引：0，他引：3  

魏旭东 《测绘与空间地理信息》2006,29(1):57-59

针对1∶5000和1∶10000比例尺地形图地形、地物要素的类型、特点、分类编码、图式符号、数字化方法、开发技术等问题进行了深入的研究,探索在AutoCAD平台下开发中比例尺地形图数字化软件,实现中比例尺地形图的定位、数据编辑、交互及批量符号化处理、自动绘制格网图廓等工作,实践证明该方法具有操作简便、地物符号齐全、图形美观、规范,实用性强等特点。  相似文献   

ArcGIS数字化地质图校正及配准     

樊敏  秦健  李云响  刘香凤  巴文艳 《化工矿产地质》2014,36(3):185-189

空间校正和地理配准是地图编绘中不可缺少的技术手段之一,利用这一手段消除图件数字化过程中产生的误差。通过ArcGIS空间校正及地理配准的数学基础说明了图件校正和配准所需点位数和方法,用栅格和矢量数据在ArcGIS系统中进行配准和校正的典型应用说明地质图件数字化的方法,采用这个方法达到精确快速解决地质工作中数据分析与研究的目的。  相似文献