浅析1∶50000地形图出版编辑技巧及质量建设

Mapstar数字测图系统是理想的地理信息生产与更新的作业平台。在地形图建库与出版方面具有方便、快捷及一体化的成图优势。本文以某项任务为背景,着重分析了1∶50 000地形图的出版方法及基本流程,指出了Map Star软件在成图过程中存在的问题及解决方法,并针对如何提高成图质量进行了阐述。     

精河到伊宁公路沿线积雪及其影响

利用MODIS和Landsat TM/ETM+遥感数据,得出研究区的积雪面积,同时结合精伊公路规划图及地形图,分析了公路沿线可能存在风吹雪和雪崩的危险区,并提出相应的防治措施。结果表明:研究区近5年来11月到次年3月是积雪最丰富时期,9月、10月、4月和5月积雪较少。近5年来积雪呈增加趋势,最大积雪时间集中在2009—2010年积雪季。MODIS积雪数据精度在积雪面积越大时,精度越高;积雪面积越小时,精度越低。精伊公路东线走廊K60以上路段和西线走廊K100以上路段风吹雪对公路影响较大;精伊公路北段的雪崩的可能性很小;东线走廊K60～K77段和西线走廊K90～K110段有一定的雪崩灾害;西线走廊K58～K90段有较大的雪崩危害。并提出防治措施。     

GPS控制网基线解算优化方法探讨

对GPS控制网基线处理中对观测数据及基线解算质量评定要素进行了总结,针对GPS控制网内业数据处理基线解算中经常出现的一些问题,总结出优化解算的原则和方法,并提出合理建议。     

Design and Implementation of the Hydrographic Production and Management Information System (HYPAMIS)

With the development of hydrographic work and information techniques, the traditional work mode is not suitable for the Chinese Marine Safety Administration Bureau (CMSAB). Aiming at the separation of charts production and management, a new idea that is the integration of production, management, and quality control is presented. Geographic Information System (GIS), Management Information System (MIS), Office Automation (OA) and Spatial Database Management (SDM) advanced techniques are introduced into the workflows in CMSAB. To realize information sharing, a mixed mode with Browser/Server (B/S) mode and Client/Serve (C/S) mode are adopted. Based on the above ideas and strategies, an integrated system named Hydrographic Production And Management Information System (HYPAMIS) was developed. The whole workflow and three subworkflows including survey management workflow, production workflow, and quality control workflow of are outlined after re-engineering the CMSAB organization. Some design principles and key techniques of the HYPAMIS including the cooperation of GIS and MIS, object-oriented spatial data model and management, data management based on database, and security control are illustrated in detail. Then the implementation of the system is introduced briefly. Finally, performance evaluation of the system and future work is given.     

基于三维GIS的数字航道若干关键技术研究

提出了基于三维GIS的数字航道的整体技术框架，研究了其中涉及的关键技术，开发了原型系统并进行了一定的应用实验。     

Analysis and Representation of Changes in Change Detection

In this paper,factors lead to changes ande what changes should be considered are firstly discussed.then changes to be represented by set theory is given.Twelve basic change types are described in detail.At last the paper points out that the change between geoobjects and pixels in images is not all corresponging and it causes the difficulty of accurate and robust change detection techniques.     

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

［1］Balce A E. Determination of optimum sampling interval in grid digital elevation models (DEM) data acquisition.Photogrammetric Engineering and Remote Sensing,1987,531:323～330 ［2］Li Z L. Sampling strategy and accuracy assessment for digital terrain modelling: [Ph. D Thesis]. UK: University of Glasgow, 1990 ［3］Li Z L. Variation of the accuracy of digital terrain models with sampling interval. Photogrammetric Record, 1992,14:113～128 ［4］Li Z L. A comparative study of the accuracy of digital terrain models(DTMs) based on various data models. ISPRS Journal of Photogrammetry and Renote Sensing,1994,49(1):2～11 ［5］Li Z L. Scale issues in geographic information science. In:Proceeding of International Workshop on Dynamic and Multi-dimensional GIS. Hong Kong, 1997. 143～158 ［6］SISM. Specification of geospatial data (Provisional) for 1:10 000 digital elevation models. The Standard Institute of Surveying and Mapping (SISM), National Bureau of Surveying and Mapping, China, 1997(in Chinese) ［7］USGS. National Mapping Program: Geospatial Data Standard, 1992 ［8］Zhu Q, Cheng C J. The fast generation and dynamic updating of TIN. Journal of Wuhan Technical University of Surveying and Mapping, 1998(in Chinese)     

2011年1月安徽安庆Ms4.8地震震源区三维速度结构与发震构造讨论

The Anqing MS4.8 earthquake occurred on January 19, 2011, with the epicenter lying in the foreland deformation belt along the Yangtze River of the lower Yangtze block. After the earthquake, the field work team surveyed and collected building damage data, calculating and obtaining more accurate intensity distributions. The focal mechanism of the main shock was calculated tentatively using digital seismic wave data from provincial digital seismic networks using the FOCMEC program and the first motions of P, SV and SH waves with their amplitude ratios. Using the location results of the main shock and aftershocks by the Anhui seismic network, combining the three-dimensional crust velocity structure imaging results of the focal region by seismic tomography, and referring on intensity distribution of the elliptic major axis’ predominant direction, we conclude by comprehensive analysis that the NE-trending Susong-Zongyang fault is possibly the causative fault of the Anqing earthquake.     

淮南台电磁扰动数据变化特征及影响因素初探

通过对淮南地震台2009～2011年电磁扰动观测数据的分析,得到如下结论:①电磁扰动三个通道均有明显的日变化规律:00:00～07:00观测数据在均值附近波动,无脉冲变化;07:00～22:00三个通道的变化幅度均出现明显增强,22:00～24:00又恢复平稳变化。通过与环境因素及淮北台电磁扰动的对比,认为环境噪声水平是影响电磁扰动日变的主要因素。②傅里叶分析结果显示电磁扰动子夜均值有明显的365、183、122 d周期,其中365 d年周期振幅最大。第一、二通道电磁扰动子夜均值冬季低,夏季高,第三通道与前两通道年变化相反。③温度对电磁绕输出信号影响的实验初步证实了温度改变时,电磁扰动三个通道的输出均有同步的响应,且理论计算与实际观测的变化幅度基本一致。因此,认为电磁扰动的年变主要是受气温的影响。     

Automatic change detection of geo-spatial data from imagery

The problems and diffi-culty of current change detection tech-niques are presented. Then, according to whether image registration is done before change detection algorithms,the authors classify the change detec-tion into two categories:the change de-tection after image registration and the change detection simultaneous with image registration. For the former,four topics including the change detec-tion between new image and old im-age, the change detection between new image and old map, the change detec-tion between new image/old image and old map, and the change detection be-tween new multi-source images and old map/image are introduced. For the latter, three categories, i. e. the change detection between old DEM,DOM and new non-rectification image,the change detection between old DLG, DRG and new non-rectification image, and the 3D change detection between old 4D products and new multi-overlapped photos, are dis-cussed.