查询词典 gis

The paper begins with the history and present condition of research and application of GIS. Then 3D GIS and its construct is introduces briefly, and the relevant background and theory are studied, such as picture segmentation, pattern recognition and vectorization technology, etc.

论文从地理信息系统领域研究应用的历史和现状入手，简要介绍了三维地理信息系统及其构成，研究了相关的背景与理论知识，如图像分割、模式识别和矢量化技术等等。

This paper adopts spatial parallelogram to estimate uncertainty of arbitrary points inside and outside the spatial triangle plane, The estimate formulae of uncertainty of spatial triangle plane and normal vector are deducted.

随着GIS在环境仿真、城市规划、气象学、自然灾害预测预报、地质采矿等领域的广泛应用，空间数据库日渐庞大，因此空间数据质量的好坏直接影响着GIS应用、分析、决策的正确性和可靠性

In application of the knowledge, maximum likelihood classification is respectively applied to every part of remote sensing images covered by individual land use type with its prior knowledge and probability.

研究表明，该方法将原有的GIS 数据和各种土地利用类型变化的先验性知识综合集成用于新的遥感图像的分类中。这不仅可以促进GIS数据更新的自动化，而且还可以得到比常规最大似然法高的分类精度。

Simultaneously,the paper is the discusion based on the purposefulness of GIS.Its reason implicit in it is the consideration to the cost/performance ratio of GIS construction.

同时，本文还是基于地理信息系统建设的目的性的一种讨论，其隐含的前提是对具体地理信息系统建设的"性/价比"的考虑。

Fire is significant among disasters in urban area. The occuring frequency of fire is the highest among all kinds of disasters, and the loss due to fire is about five times of that due to earthquake. At the present, the tasks such as searching fire control information, disposing alarm telephones and make dispatch, are still accomplished in manual manner domestically. Current commanding system of fire fighting drops behind the development of cities, so that the setout time of fire companies is delayed.

中文题名城市消防指挥系统中的GIS和虚拟现实应用技术副题名外文题名 The application technology of GIS and VR in commanding system of fire fighting for urban area 论文作者许云导师任爱珠教授学科专业防灾减灾工程及防护工程研究领域\研究方向学位级别博士学位授予单位清华大学学位授予日期2002 论文页码总数115页关键词地理信息系统虚拟现实消防指挥系统火灾馆藏号BSLW /2003 /TU998.1 /4 火灾是城市灾害中的重要灾种，其发生频度居各灾种之首，造成的直接损失约为地震的五倍。

Ultra-high frequency method has been widely used for partial discharge detection in Gas insulated substation, but the feature extraction for UHF PD signals is a difficult issue all the while.

UHF 法作为GIS 设备PD 检测的有效方法已得到了广泛的应用，但GIS 内UHF PD 信号的特征提取一直是研究的难点问题。

The paper based on component technology and COM, study and design the vector graph component, realize the function of vector graph, such as the input and output of map, the display of map, mutual plot with mouse, etc.

本文以组件技术和组件对象模型(COM，Component Object Model)为基础，研究和设计GIS矢量图形组件，实现GIS系统的矢量图形功能，如地图的输入输出、地图的显示、鼠标交互绘图等。

The insulation of apparatus in the power system is often broken by the very fast transient overvoltagewhich is caused by the operation of disconnector in gas insulate substation In this paper, a new idea for the suppressing VFTO by ferrite is put forward, and the characteristic of ferrite is analyzed.

GIS中隔离开关操作时产生的特快速暂态过电压对电力系统及其设备的绝缘具有巨大的破坏力，本文提出了采用铁氧体来抑制GIS中隔离开关操作时产生VFTO的方法，分析铁氧体抑制VFTO的优点，对VFTO的抑制效果进行了实验研究和仿真分析，探讨了具有理想抑制效果的铁氧体参数的具体要求和对理想抑制参数的铁氧体尺寸的估算方法。

The concerned research works of VFTO is investigated.A new transient circuit model to the question of the steep front and high amplitude value of VFTO is proposed based on general transient circuit model. The numeric simulation that disconnector switched off short bus has been proceeded by using above circuit model and the comparison of results with the one based on EMTP are given.

首先针对操作GIS中隔离开关所产生的快速暂态过电压上升时间短及幅值高的特点，在一般暂态电路模型的基础上提出了新的暂态电路模型，并利用该模型，对GIS中隔离开关切断短母线的等值电路进行了数值模拟，并与电磁暂态程序的计算结果进行了比较。

Based on the GIS and RS techniques and the Landsat TM/ETM data and applying the principle of Landscape Ecology and the technique of GIS, the authors studied the dynamic change of the landscape pattern from 1991 to 2000 in Yanchi County of Ningxia, one of the typical farming-pasture ecotonal areas in China.

基于遥感和地理信息系统技术，以Landsat TM/ETM图像为基本数据源，综合运用景观生态学理论和方法，对我国典型农牧交错生态脆弱区宁夏盐池县1991~2000年生态景观格局动态变化进行了研究。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。