盆地构造图三维可视化系统开发的实例介绍     

刘云生  陈军  王必金  王海亮  卢明国 《上海国土资源》2008,(2):39-43

传统的二维构造图难于直观地描述地质构造的空间形态。综合利用VB、VC和OPENGL环境设计的盆地构造图三维可视化系统将构造图上涉及的要素分成点、线、面、区等不同类型,每个类型数据又都由空间数据和属性数据两部分组成,并用数据库方式管理这些数据。系统除了可将各构造要素以三维方式显示外,还可以利用测井数据和剖面图恢复三维地层;同时允许用户与屏幕图形进行交互,从而实现对图形的切割操作。显示成果可以以栅格图形或AVI录像形式输出。通过几个用该系统输出的三维构造图的实例说明该系统基本能满足盆地构造图三维显示的需要。  相似文献   

Guidelines for landslide susceptibility, hazard and risk zoning for land use planning   总被引：41，自引：2，他引：39  

Robin Fell  Jordi Corominas  Christophe Bonnard  Leonardo Cascini  Eric Leroi  William Z. Savage 《Engineering Geology》2008,102(3-4):85

  相似文献   

水文等值线图特征要素提取研究     

杨海坤  刘九夫  沈冰 《水文》2008,28(1):21-24

阐述了特征要素对水文等值线图网格化的重要性.通过比较分析两种经典的数学形态学骨架提取算法的应用效果,认为最大数字圆盘定义的骨架更接近于水文等值线图的特征要素分布.针对由最大数字圆盘算法得到的骨架线存在的一些不足,对其作消噪、粘合和细化等进一步改进处理.对相关结构元素的形状和大小给出建议.  相似文献   

GIS-based weights-of-evidence modelling of rainfall-induced landslides in small catchments for landslide susceptibility mapping   总被引：10，自引：0，他引：10  

Ranjan Kumar Dahal  Shuichi Hasegawa  Atsuko Nonomura  Minoru Yamanaka  Takuro Masuda  Katsuhiro Nishino 《Environmental Geology》2008,54(2):311-324

Landslide susceptibility mapping is a vital tool for disaster management and planning development activities in mountainous terrains of tropical and subtropical environments. In this paper, the weights-of-evidence modelling was applied, within a geographical information system (GIS), to derive landslide susceptibility map of two small catchments of Shikoku, Japan. The objective of this paper is to evaluate the importance of weights-of-evidence modelling in the generation of landslide susceptibility maps in relatively small catchments having an area less than 4 sq km. For the study area in Moriyuki and Monnyu catchments, northeast Shikoku Island in west Japan, a data set was generated at scale 1:5,000. Relevant thematic maps representing various factors (e.g. slope, aspect, relief, flow accumulation, soil depth, soil type, land use and distance to road) that are related to landslide activity were generated using field data and GIS techniques. Both catchments have homogeneous geology and only consist of Cretaceous granitic rock. Thus, bedrock geology was not considered in data layering during GIS analysis. Success rates were also estimated to evaluate the accuracy of landslide susceptibility maps and the weights-of-evidence modelling was found useful in landslide susceptibility mapping of small catchments.  相似文献   

Timing and cause of water level fluctuations in Kluane Lake, Yukon Territory, over the past 5000 years     

Janice Brahney  John J. Clague  Thomas 《Quaternary Research》2008,70(2):213-227

We reconstructed late Holocene fluctuations of Kluane Lake in Yukon Territory from variations in bulk physical properties and carbon and nitrogen elemental and isotopic abundances in nine sediment cores. Fluctuations of Kluane Lake in the past were controlled by changes in climate and glaciers, which affected inflow of Slims and Duke rivers, the two largest sources of water flowing into the lake. Kluane Lake fluctuated within a narrow range, at levels about 25 m below the present datum, from about 5000 to 1300 cal yr BP. Low lake levels during this interval are probably due to southerly drainage of Kluane Lake to the Pacific Ocean, opposite the present northerly drainage to Bering Sea. Slims River, which today is the largest contributor of water to Kluane Lake, only rarely flowed into the lake during the period 5000 to 1300 cal yr BP. The lake rose 7-12 m between 1300 and 900 cal yr BP, reached its present level around AD 1650, and within a few decades had risen an additional 12 m. Shortly thereafter, the lake established a northern outlet and fell to near its present level.  相似文献   

Using CORINE land cover and the point survey LUCAS for area estimation   总被引：3，自引：0，他引：3  

Javier Gallego  Catharina Bamps 《International Journal of Applied Earth Observation and Geoinformation》2008,10(4):467

CORINE land cover 2000 (CLC2000) is a European land cover map produced by photo-interpretation of Landsat ETM+ images. Its direct use for area estimation can be strongly biased and does not generally report single crops. CLC areas need to be calibrated to give acceptable statistical results.LUCAS (land use/cover area frame survey) is a point survey carried out in 2001 and 2003 in the European Union (EU15) on a systematic sample of clusters of points. LUCAS is especially useful for area estimation in geographic units that do not coincide with administrative regions, such as set of coastal areas defined with a 10 km buffer. Some variance estimation issues with systematic sampling of clusters are analysed.The contingency table obtained overlaying CLC and LUCAS gives the fine scale composition of CLC classes. Using CLC for post-stratification of LUCAS is equivalent to the direct calibration estimator when the sampling units are points. Stratification is easier to adapt to a scheme in which the sampling units are the clusters of points used in LUCAS 2001/2003.  相似文献   

特征分类与邻近图相结合的建筑物群空间分布特征提取方法   总被引：2，自引：0，他引：2  

郭庆胜  魏智威  王勇  王琳 《测绘学报》2017,46(5):631-638

建筑物群综合过程中需要对建筑物群空间分布特征进行认知和识别。本文在分析国内外相关研究的基础上,从描述建筑物空间特征的大量指标中,利用主成份分析方法,总结并提出了有代表性的建筑物空间特征指标集:凸包面积、紧密度IPQ指标、边数和最小面积外接矩形方向,并基于这些指标研究了建筑物群的分类。在利用最小生成树邻近图(MST)划分建筑物空间子群时,考虑了建筑物成群与所处地理环境(河流和道路等因素)的关系。另外,基于最邻近图(NNG)、MST、相对邻近图(RNG)和Gabriel图(GG)4种建筑物群邻近图,提出了自动识别具有特定空间排列建筑物子群的方法,并比较分析了识别结果的影响因素和可用性。最后,选择北京某地区建筑物群为试验对象,实现了对建筑物群的分类和空间聚类,并提取了其中直线型空间排列的建筑物子群。  相似文献   

手绘地图开域空间方向关系检索法     

安晓亚  刘平芝  金澄  徐道柱  王峰 《测绘学报》2017,46(11):1899-1909

为满足智能化检索地理信息的需求,提出一种基于开域空间方向关系的手绘地图检索方法。首先设计了一种适用于手绘地图检索的开域空间方向关系描述模型。该模型通过开域既能自适应精确描述,又可通过松弛化策略模糊描述手绘对象间方向关系。提出基于开域空间方向关系的手绘地图检索流程,建立了R树空间索引和方向关系相似度计算模型,给出了输出结果的评价方法。采用实际数据的试验结果表明,该方法可在较大范围地图场景中有效检索到排名靠前的结果。  相似文献   

基于百度地图的国家安全生产事故时空分析技术     

黄颖  郭明强  谢忠  吴亮 《测绘工程》2017,26(11)

国家安全生产事故信息化管理和分析是关系国家资产和群众安全的重要工作。针对国家安全生产事故信息化管理在时空分析上的薄弱环节,文中以国家安监局提供的2000—2015年国家安全生产事故数据为支撑,研究基于百度在线地址解析服务的事故空间位置在线解析技术,采用百度地图热力图可视化技术对国家安全生产事故进行时空分析,为政府部门管理和预防安全生产事故提供决策支持。  相似文献   

基于机载LiDAR的沿海滩涂地形图制作方法研究     

吴迪  汪建光  李水英 《测绘与空间地理信息》2017,(2)

在当前海洋经济的发展迫切需要高精度的沿海滩涂地形数据作为海洋工程规划实施保障的背景下,本文基于浙江省海洋测绘工程的实践,提出了一套基于机载LiDAR技术进行滩涂地形图制作的方法。通过对滩涂地形图的表达形式、制作流程以及高程要素提取和多源数据融合等关键技术问题进行研究,在全国率先完成了全省高精度滩涂地形图的绘制,实现了浙江省地形图的陆海一体化,相关经验对国内类似项目的开展具有重要的参考意义。  相似文献