CASS软件实现全数字测图编辑一体化

探讨应用专业AutoCAD软件功能解决DLG测绘产品的数据编辑技术,实现全数字摄影测量与后端计算机编辑一体化工艺流程技术。讨论使用CASS测绘软件批量修改数据的图层、编码、图块、线型等信息的技术方法,提高测绘数据处理能力。     

延川县地质灾害详细调查实践与认识

延川县地处陕北黄土梁峁沟壑区,地质灾害频发。通过遥感解译、地面调查,查明了区内地质灾害类型、规模、特点及其分布规律。     

Outlines of New Global Geochemical Mapping Program

<正>Since 1988,great efforts and enthusiasm had been paid by applied geochemists in the implementation of global geochemical mapping through the International Geological Correlation Program's Projects 259 and 360,and the Task Group on‘Global Geochemical Baselines' established by the International Union of Geological Sciences(IUGS),in collaboration with the International Association of Geochemistry(IAGC).But how to use extremely low-density sampling to obtain a global picture of the distribution of most elements in the periodic table in a reasonably short time is still a great challenge faced by the applied geochemistry community.It will depend on the continuous development of new mapping concept,and the advisable and courageous innovation of methodology for searching other suitable sample media and sampling layout.Based on the encouragement results obtained from the representativeness study of delta sediments conducted at the mouth of Yangtze River,and at the mouths of its four major tributary,it is expected to broadly apply the geochemical fractal self-similarity nature to main rivers and their estuaries with catchments up to hundreds of thousands or over a million square kilometers in the world.With this new mapping concept,a new outlines of a Global Geochemical Mapping Program was advanced and the establishment of an International Research Center of Global Geochemical Mapping was also suggested to facilitate the programs implementations.     

航空视电阻率填图技术在内蒙古自治区二连浩特～东乌旗地区应用研究

利用HDY-402型三频补偿式航电系统,在内蒙古自治区二连浩特～东乌旗地区获得的实测数据,通过反演计算,将实测的航空电磁场数据转换成反映地下地质体的视电阻率(ρs),根据ρs值的差异及分布趋势,以1:200000地质图为先验条件,对内蒙古自治区二连浩特～东乌旗地区进行了岩性构造填图,显示了该技术良好的应用效果。     

压裂微震数据的快速读取及可视化

压裂微震数据采集具有采样时间长,以及采样间隔小的特点,采集得到的数据量很大。因此数据的读取和显示,需要一些特殊的方法,进而能有效地分析数据中的微震事件。针对微震数据的特点,这里运用LOD(Level of Detail)和内存映射,来实现微震数据快速读取和可视化,为精确反演微震事件奠定了基础。     

WebGIS中间件在WebGIS开发中的优势和灵活性

以ArcGIS Server为核心技术并以ESRI公司的控件为基础的WebGIS,其开发在某种程度上受到一定限制和约束,为了摆脱这些限制和约束,开发了WebGIS中间件,并以北京数字市政地下管网系统为例进行说明.     

Use of regionalized stormflow coefficients with a view to hydroclimatological hazard mapping

Abstract

An attempt was made to compensate for the lack of long hydrological time series and the lack of information on maximum streamflow in the Alzette River basin (Luxembourg) via the regionalization of stormflow coefficients. Streamflow data recorded since 1995 with a very dense streamgauge network allowed the determination of maximum stormflow coefficients in 18 sub-basins of the Alzette. The stormflow coefficients were then regionalized via stepwise multiple regression analysis for 83 different sub-basins of the Alzette. Combined with 10-year daily rainfall heights (statistical estimation), this regionalization allowed the spatial variability of storm runoff in the Alzette basin to be mapped, thus providing a view of hazard and risk-producing areas, as well as of risk-exposed areas. In a basin with little historical hydrological information this technique can help identify areas where storm runoff reducing measures should be applied from the outset.     

复杂野外地质属性数据的快速采集方法探讨

研究、开发计算机辅助填图系统的野外数据采集子系统的关键是要解决快速采集数据的问题。通过编制特别的野外数据录入专用软件 ,把数据库的前端和后端分离 ,使用多数据表单界面录入技术和标准词条的屏幕提示录入技术 ,大量使用组合快捷键 ,采用动态数据模型技术 ,综合集成先进设备和空间坐标的实时自动捕获等方法 ,可以有效提高野外地质数据的采集速度。     

MAPGIS在遥感解译中的应用

MAPGIS是国内优秀的、集GIS功能与遥感图像处理功能于一体的软件平台。本文简要介绍了其专业图像处理子系统的基本功能，并根据笔者工作体会，总结出利用该软件开展遥感解译、制作数字化专题图的工作流程。     

Ground zoning against seismic hazard in Athens, Greece

The 1999, Ms=5.9, Athens earthquake caused serious structural damage to buildings in the western part of Athens, Greece. This paper presents the ground zoning against seismic hazard proposed shortly after the earthquake in order to aid reconstruction of the area. Existing engineering geological and geotechnical data were combined with local observations to provide a unified set of classification criteria, consistent with provisions of the Greek Seismic Code EAK. The accuracy and the possible limitations of this zoning procedure are addressed through comparison with observed damage distribution as well as results from seismic ground response analyses performed at sites with well established soil profiles. There is clear evidence that the proposed zones correspond to geological formations exhibiting grossly different seismic response with regard to the design of common engineering structures. However, the mostly qualitative nature of the guidelines for ground categorisation provided by EAK and the general lack of systematic, site-specific geotechnical data for the whole area induce uncertainties in the definition of the seismic design actions for the different zones. These objective uncertainties certainly demand increased conservatism but do not limit application of the proposed methodology for first aid, preliminary planning in the event of destructive earthquakes.