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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 相似文献
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ZHAO Xi PANG Xiaoping ZHANG Shengli ZHANG Xiang 《地球空间信息科学学报》2007,10(1):75-78
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. 相似文献
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JINBaoxuan BIANFuling ZUOXiaoqing WANGFangxiong 《地球空间信息科学学报》2005,8(2):115-121
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. 相似文献
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ZHANG Zhenglu LUO Changlin DENG Yong XIE Niansheng 《地球空间信息科学学报》2006,9(4):235-239
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… 相似文献
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ZHANGZhenglu ZHANGSonglin 《地球空间信息科学学报》2004,7(3):198-203
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. 相似文献
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Neural network based on rough sets and its application to remote sensing image classification 总被引:2,自引:0,他引:2
WUZhaocong LIDeren 《地球空间信息科学学报》2002,5(2):17-21
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. 相似文献
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《地图》1989,(2)
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. 相似文献
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LD2000 System with 3S and Multi—sensor 总被引:2,自引:0,他引:2
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. 相似文献
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JIAO Limin LIU Yaolin 《地球空间信息科学学报》2007,10(2):151-156
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. 相似文献
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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. 相似文献
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北京市1:50000地形图缩编更新生产工艺设计 总被引:1,自引:0,他引:1
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. 相似文献
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pGM(1,1)模型在变形预测中的应用 总被引:1,自引:0,他引:1
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。 相似文献
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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。 相似文献
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