多约束条件下示意性道路网地图渐进式综合(英文)

Multiple constraints for schematic road network map cartographic design are analyzed and summarized. Based on this, a set of quantitative criteria are set up and a new road network generalization method including progressive selection and displacement is proposed. Furthermore, topological checking methods for road networks are researched. Based on these constraints, the points in a road network are classified, and a satisfactory and effective schematic map is designed in a con- crete experiment while maintaining topological consistency of the road network between the original and the schematic map     

Unification and Harmonization in True Color Image City Map

True color image city map is a sort of new-style map which combines the high resolution image and map symbols and shows both advantages in visualization. At the same time, the map unification and harmonization should be taken into account dur-ing the design process, since some visual conflicts appear when map symbols overlaid on the true color image. The objective of this research is to explore the rules in the process of true color image city map design based on chromatic and aesthetic knowledge. At the end, taking the Image Atlas of Guangzhou as an example, image color adjustment, road network presentation, and symbol de-signing issues will be discussed in the application.     

Study on visualization of virtual city model based on internet

With the rapid development of computer graphics, distributed-computing and Internet, it is possible to achieve Internet-based virtual city. This paper dwells on the method of the terrain and its feature modeling and complex entity modeling in the virtual city. Then, discusses the method for Internet-based virtual city 3D visualization and the design of the Browser/Server architecture of the system of virtual city in the network environment. Finally, Java and Java 3D are used to show an experiment example, and the related conclusion about Internet-based virtual city 3D displaying and the client-side interactive operation is given.     

Design of high precision horizontal control network for large-scale hydropower project

IntroductionThe design of high precision horizontal controlnetwork for large-scale hydropower project toconstruct control network and measure deforma-tion of monitoring network.It can be also divid-ed into horizontal control network and verticalcontrol ne…     

Allowance of lateral breakthrough error for super long tunnels from 20km to 50km

Up to now there is no specification about the allowance of lateral breakthrough error for super long tunnel from 20 km to 50 km. On the basis of the design of GPS networks located outside and inside tunnel traverse network, we propose a method for calculating the influence value caused by control surveying errors.Through a lot of simulative calculations and combination with piercing practice of super tunnels in Wan Jiazai Project, Shanxi province, we present an allowance table of lateral breakthrough error for super long tunnels from 20 km to 50 km.     

Neural network based on rough sets and its application to remote sensing image classification

This paper presents a new kind of back propagation neural network(BPNN) based on rough sets,called rough back propagation neural network (RBPNN).The architecture and training method of RBPNN are presented and the survey and analysis of RBPNN for the classification of remote sensing multi-spectral image is discussed.The successful application of RBPNN to a land cover classification illustrates the simple computation and high accuracy of the new neural network and the flexibility and practicality of this new approach.     

LD2000 System with 3S and Multi—sensor

This paper introduces a car-borne road information collecting and updating system (LD2000) developed by Wuhan Technical University of Surveying and Mapping.This system is capable of collecting road network information and creating digital road network effectively by means of GPS,GIS and multi-sensor integration.The design and development of LD 2000 system are also presented in this paper.     

COMPUTER-AIDED DESIGN OF MAP COLOR

The design of map color is an important part in map design, especially for thematic mapping, importance is no less than that of map content itself.Tranditional method in map color design is to make several designing variants and then make a comparison among them and finally choose one of them.This method is time-consuming and rather expensive.With the development of interactive computer graphics,now the design of map color can be completed by means of computer processing. During this procedure, cartographer's knowledge in map design, rich color in computer and the powerful functions of graphic processing of computer can be combined together. Three main problems about comprter-aided design of map color are discussed in this paper: The first is to create a database which forms the basis of color producing; the second is to create a cartographic database for organized raster data; the third is to design an interactive svstem for the design of map color with the support of the two databases mentioned above.     

Model of Land Suitability Evaluation Based on Computational Intelligence

A novel model of land suitability evaluation is built based on computational intelligence (CI). A fuzzy neural network (FNN) is constructed by the integration of fuzzy logic and artificial neural network (ANN). The structure and process of this network is clear. Fuzzy rules (knowledge) are expressed in the model explicitly, and can be self-adjusted by learning from samples. Genetic algorithm (GA) is employed as the learning algorithm to train the network, and makes the training of the model efficient. This model is a self-learning and self-adaptive system with a rule set revised by training.     

融合VISI的Web GIS人机界面交互设计(英文)

The fusion of VlSI （visual identity system Internet）, digital maps and Web GIS is presented. Web GIS interface interactive design with VISI needs to consider more new factors. VISI can provide the design principle, elements and contents for the Web GIS. The design of the Wuhan Bus Search System is fulfilled to confirm the validity and practicability of the fusion.     

北京市1:50000地形图缩编更新生产工艺设计

结合北京市地理数据现状,在对现有数据和国家1:50000地形图缩编要求综合分析基础上,设计了利用1:10000DLG缩编更新北京市1:50000地形图的生产工艺.该工艺不仅有效的利用了现有的正射影像和矢量资料,而且将搜集到的民政勘界、交通专题数据有机地运用到1:50000地形图缩编更新中去,较好地满足了国家1:50000地形图缩编更新的要求.实践证明,本文设计的缩编工艺是可行的,对其他单位和部门的1:50000地形图缩编生产具有一定的参考价值.     

pGM(1,1)模型在变形预测中的应用

分析了GM（1，1）模型在背景值取值上的不足，提出了一种基于权的pGM(1,1)模型，通过模型比较，表明pGM(1,1)模型具有更好的预测效果，并用该模型进行了实际的变形预测。     

基于新陈代谢GM(1,1)模型的益阳城市化水平分析

以益阳市2001年-2010年城市化水平数据为依据,运用灰色系统理论,建立了GM(1,1)和新陈代谢GM(1,1)预测模型;并运用不同方法对2种模型的精度进行了检验,结果表明,新陈代谢GM(1,1)模型优于常规GM(1,1)模型,其精度更高。应用新陈代谢GM(1,1)模型,对益阳市城市化水平未来10年进行预测,其结果符合益阳市城市化的实际情况。     

基于GeoEye-1卫星影像的立体测图技术研究

以某试验区的GeoEye-1卫星遥感影像、外业控制资料等数据为基础进行影像区域网平差解算,对平差精度进行分析,并通过部分试验区外业调绘来分析GeoEye-1卫星遥感影像是否满足国家相应规范中1∶10 000、1∶5 000以及1∶2 000地形图修测要求,最终形成基于GeoEye-1卫星遥感影像的立体测图生产工艺流程。     

基于GeoEye-1和DEM的富家坞铜矿区固体废弃物危险性分析

在ArcGIS支持下,利用1:5万.DEM对江西德兴富家坞铜矿区与铜厂矿区的汇流累积量和集水流域进行模拟,将该区划分为a、b两个流域,分水岭方向为NEE-SWW;将富家坞矿区所在流域a进一步划分为3个小的集水流域.在矿床学及采矿学等理论的支持下,利用美国GeoEye-1卫星数据,采用人机交互解译方式,对富家坞铜矿区固体...     

GeoEye-1立体像对定位精度分析及应用

对GeoEye-1立体定位模型进行初步研究,给出消除RPC模型系统误差的控制点选择和区域网平差方案。结合PixelGrid进行了基于不同布点方案下区域网平差实验,并和INOKOS定位精度进行对比分析。结果表明,加入少量控制点(1～9个)可明显消除RPC模型系统误差,平面精度达到0.2～0.3m,高程精度达到0.5m,能满足公路勘测选线1∶2000测图要求,高分辨率正射影像和数字地面模型可直接用于公路勘测选线设计。     

改进的GM(1,1)模型及其应用分析

GIM(1)模型是一种改进的GM(1,1)模型。文章在介绍两种模型的基础上,分别进行实例计算和分析,得出了GIM(1)具有更大的优越性,具有预测结果精确,对时间的依赖性较小的特点。     

精密单点定位关键误差源及其改正方法研究

介绍了IGS分析中心最新发布的5s采样间隔精密卫星钟差产品，以及利用地磁场数据消除电离层高阶项影响的方法；比较了最新提出的几种对流层延迟投影函数，并得出参数格网化的VMF1模型比传统的Niell投影模型性能更优异的结论。     

GM(1,1)多项式拟合模型在变形监测中的应用

GM(1,1)具有要求样本数据少,运算方便,短期预测精度高等优点,因此而得到广泛应用;但它也存在一定的局限性,其主要适用于单一的指数增长的模型,对序列数据出现异常情况很难预测。为了改善这一局限性,将其与多项式拟合进行组合,通过实例分析证明组合模型比单一模型拟合精度更高,达到比较好的效果。     

自适应GM(1,1)模型进行地表沉降预报

提出采用自适应GM( 1 ,1 )模型进行地表沉降预报 ,并用于兖州某矿形变控制点的沉降预报 ,效果令人满意。说明此模型具有实用价值。