面向网络一体化国土资源信息系统解决方案     

张秋义 姚敏安代伟  刘生叔 《地理信息世界》2005,3(B08):27-31

通过分析当前国土资源电子政务的现实需要和发展趋势，总结当前国土资源信息系统建设的关键技术，提出了基于大型全组件式地理信息系统SuperMap GIS的面向网络一体化国土资源解决方案。该解决方案成功地应用于柳州市国土资源局国土资源信息系统建设，建成了业务流程一体化、空间数据管理一体化、开发与应用一体化的大型国土资源信息系统，取得了良好的经济效益和社会效益。  相似文献   

Neural networks and landslide susceptibility: a case study of the urban area of Potenza   总被引：4，自引：1，他引：3  

Donatella Caniani  Stefania Pascale  Francesco Sdao  Aurelia Sole 《Natural Hazards》2008,45(1):55-72

For those working in the field of landslide prevention, the estimation of hazard levels and the consequent production of thematic maps are principal objectives. They are achieved through careful analytical studies of the characteristics of landslide prone areas, thus, providing useful information regarding possible future phenomena. Such maps represent a fundamental step in the drawing up of adequate measures of landslide hazard mitigation. However, for a complete estimation of landslide hazard, meant as the degree of probability that a landslide occurs in a given area, within a given space of time, detailed and uniformly distributed data regarding their incidence and causes are required. This information, while obtainable through laborious historical research, is usually partial, incomplete and uneven, and hence, unsatisfactory for zoning on a regional scale. In order to carry this out effectively, the utilization of spatial estimation of the relative levels of landslide hazard in the various areas was considered opportune. These areas were classified according to their levels of proneness to landslide activity without taking recurrence periods into account. Various techniques were developed in order to obtain upheaval numerical estimates. The method used in this study, which was applied in the area of Potenza, is based on techniques derived from artificial intelligence (Artificial Neural Network—ANN). This method requires the definition of appropriate thematic layers, which parameterize the area under study. These are recognized by means of specific analyses in a functional relationship to the event itself. The parameters adopted are: slope gradient, slope aspect, topographical index, topographical shape, elevation, land use and lithology.  相似文献   

美国长期生态学研究网络（LTER）计算机基础设施现状、挑战与未来发展趋势   总被引：1，自引：0，他引：1  

牛栋  杨萍  何洪林 《地球科学进展》2008,23(2):201-205

信息化基础设施战略规划是美国长期生态学研究网络（LTER）战略规划的重要组成部分。在美国国家科学基金会资助下,来自多个领域的专家在系统分析美国长期生态学研究网络信息化基础设施的现状及面临挑战的基础上,提出了为支持LTER在未来（几）十年的核心科学计划——社会与环境综合科学计划,在站点、网络办公室、网络层次需要开展的一系列信息化基础设施活动及产出,为未来开展LTER信息化基础设施建设提供指导。同时也可为中国生态系统研究网络（CERN）及世界其他长期生态学研究网络的规划与发展提供启示。  相似文献   

辽宁省国土资源省市县三级网络系统建设的规划与设计   总被引：1，自引：0，他引：1  

刘国华  张书波 《国土资源信息化》2008,(3):18-22

随着社会经济的发展,国土资源管理工作面临新形势和新要求,需要建立省市县三级联动的管理体系,实现资源共享和网络化管理。通过采用成熟的网络建设和网络安全技术,建立安全、可靠的全省省市县三级网络系统,建成国土资源管理系统互联互通、信息共享的快速通道,实现国土资源信息高速传输,实现国土资源信息共享和网络化国土资源管理。  相似文献   

基于CUDA的地表水动态模拟并行方法     

吴钱娇  陈玉敏 《地球信息科学学报》2020,22(3):505-515

如何高效地动态监测、模拟和预测地表水过程是防灾减灾中亟待解决的问题,也是科学化的国土整治、区域规划、环境保护和水资源管理的基础。因此,本文利用统一计算设备架构(CUDA)对基于不规则三角网(TIN)的地表水动态模拟算法进行并行化改进,提出了一种基于CUDA的地表水动态模拟并行方法,旨在对任意时刻的地表水进行快速、高精度的动态模拟,从而满足实际的应用需求。该算法从高精度的数字高程模型(DEM)中提取地形特征点和流域线,生成受流域线约束的TIN。在此基础上,根据TIN表面的三角面坐标数据获取水流方向,再结合任意位置的降雨源点追踪得到流水线网络。基于曼宁公式,利用流水线流速计算核函数得到每条流水线上雨滴的流速,结合预设的时间,利用汇流量统计核函数得到该时刻的地表汇流量。具体的并行化过程包括数据的传输,CUDA中线程的划分和流水线流速计算核函数和汇流量统计核函数的实现。本文选取位于加拿大新布伦瑞克西北部的BBW(Black Brook Watershed)流域作为实验样区,将该算法与改进前的方法进行对比表明,该模型在保持精度的同时,大幅提高了模拟效率,加速比达到11.2;另外,通过与SWAT(Soil and Water Assessment Tool)模型进行对比,结果表明,该并行方法的Nash系数提高了88%,相关系数提高了5%。  相似文献   

改进约束D-TIN的等高线陡坡区域识别     

范亚浩  吴晟  张长胜  李英娜  李川 《测绘科学》2017,42(11)

针对高线图中陡坡区域特征的自动识别问题,在应用Delaunay三角网与线性插值法生成等高线图的基础上,改进了基于最大角原则生成约束Delaunay三角网的算法,对等高线图进行了三角剖分,根据等高线之间约束三角形的几何参数,计算了等高线图坡面单元坡度,识别出坡度较高区域。进一步地,给出了一种扩张算法对相连陡坡单元进行划分形成陡坡区域,计算了各个陡坡区域中心坐标、面积与平均坡度。通过对12组有256个坐标高程值的数据构建约束D-TIN并生成三维地形图对识别结果进行了评价,识别正确率达0.903,平均识别时间为33ms。实验表明,对于不同数据生成的不同等级等高线图的识别结果均有较高的效率与准确率。  相似文献   

The economic value of streets: mix-scale spatio-functional interaction and housing price patterns     

《Applied geography (Sevenoaks, England)》2017

Location factors are vital elements for describing housing price variation. However, limited studies have explicitly illustrated the relationship between urban design and the heterogeneity of housing price patterns. This article specifically evaluates how the interactions between the spatial layouts and land-use system at various scales through street network affect the valuation of the residential properties and the segmentation of housing markets in a network-based Mixed-scale Hedonic Model (MHM) where the submarkets pattern are determined and annotated by the spatially varying estimates on streets. The application of the delivered method in the case of Shanghai City, China, confirms the necessity of using the non-Euclidean distance metric and represent the coexistence between the stationarity and the non-stationarity of the introduced street accessibility variables. The results provide evidence that the impacts of street accessibility measures on the local levels showcase significant spatial variation. It is common for all the places that the properties located on the streets with the higher levels of angular closeness, smaller values of angular betweenness and longer angular distance to the nearby land-uses at the larger scales will be bided higher. It is proven that our delineation of submarket performs better in prediction accuracy than the traditional submarket specifications. The detected submarkets pattern yields that reachable land-use diversity at the pedestrian level is not a preferred factor in the housing submarkets located in the developed city centres. The signs of the price effects of the angular distance to local land-uses distinguish the developing submarkets as two main groups with different degrees of geometrical walkability. It is suggestive that continuously developing pedestrian-oriented neighbours in the walkable areas could contribute to decelerating the growth of house price in Chinese cities. The productions of this study can enrich the understanding of the socioeconomic effects of urban design with greater spatial precision across submarkets.  相似文献   

A modelling framework for the study of Spatial Data Infrastructures applied to coastal management and planning     

Jade Georis-Creuseveau  Christophe Claramunt  Françoise Gourmelon 《International journal of geographical information science》2017,31(1):122-138

The continuous development of Spatial Data Infrastructures (SDI) provides a favourable context for environmental management and planning. However, it appears that the actual contribution of SDIs should also depend on the correlation between users’ expectations and the services delivered to them. Several studies have addressed some organizational, methodological and technological aspects of the development of SDIs. However, only a few studies have, to the best of our knowledge, studied SDI use at large. This article introduces a methodological approach oriented towards the study of the relationship between SDIs and the users interacting with them as part of their professional practices. Our study is applied to coastal zone management and planning in France. This approach combines structural and data flow modelling. The former is based on Social Network Analysis (SNA) and the latter on Data Flow Diagrams (DFD). This modelling approach has been applied to an online questionnaire and semi-structured interviews. The results identify the SDIs, geographical data flows and institutional levels implied in French coastal zone management and planning.  相似文献   

网络RTK动态中长基线模糊度解算方法比较研究     

王珍 《测绘与空间地理信息》2016,(2):71-74

论文对比分析了网络RTK中长基线模糊度固定方法中无电离层组合+宽巷模糊度解算与原始模糊度整体解算两种方法的优劣。实验结果表明:与现有的模糊度解算方法相比,观测值域内的模糊度固定不但可以快速可靠地固定宽巷整周模糊度,而且提高了L2模糊度正确固定的成功率和效率。  相似文献   

贵阳市似大地水准面精化项目建设     

石平  裴志刚  娄中军 《测绘与空间地理信息》2016,(4):194-196,200

为解决CORS系统中GNSS高程受技术条件限制精度不高的问题,贵阳市进行了区域似大地水准面精化工作。本文论述了GNSS和水准网的布设及精度,使用了3 877个点重力数据和54个GNSS水准资料,以EIGEN03C地球重力场模型作为参考重力场,由第二类Helmert凝集法完成大地水准面计算,利用球冠谐调和分析方法将GNSS水准与重力似大地水准面联合求解得出的2'!2'格网似大地水准面,在高原高差地区其精度达到"0.010 m。  相似文献