基于模板的专题制图数学模型构建和应用

数学模板是基于面向对象的理念对专题制图数学模型所涉及的参数变量、数学运算的一种抽象和结构化。提出通过数学模板的嵌套和递归调用构建专题制图数学模型的新思路。基于这种思路,设计数学模型构建软件,通过该软件可以把数学模型分解为数学模板并以文件的形式提供给专题制图系统使用。这种方法具有非编程、灵活、可扩展性强等优点。     

Web browser控件在GIS查询分析显示中的应用研究

针对传统的GIS查询分析结果的显示方法存在的不足,本文提出了利用Web browser控件技术以Web页面形式显示的方法。介绍了基于Web browser的GIS查询分析结果的显示中应用的原理和方法步骤,深入剖析了其功能实现过程中遇到的问题和解决的关键技术,并通过实例进行了验证。     

动画地图中感知变量初探

根据动画地图的特点,考虑动画地图的空间认知特性,提出了感知变量这一新概念,将传统动画地图设计中常用的视觉变量进行拓展,并对感知变量的分类进行了阐述,指出听觉变量和触觉变量等具有较好的辅助作用。另外,通过新闻动画地图的设计与实现,总结了感知变量在动画地图中的作用及应用规律,并指出感知变量的研究对电子地图设计具有较大的理论意义和实际应用价值。     

基础电子地图符号尺寸设计的研究与实践

在调查实验结果的基础上,分析了对基于基础地理数据的电子地图（基础电子地图）符号尺寸设计的影响因素和设计原则,对电子地图符号尺寸设计、提高符号表现力进行了一些理论探讨和实践尝试。     

基于核心序列优先的倒转地层构模方法

在三维地层建模过程中,一些复杂的地质构造(如倒转褶皱)往往需要人工干预才能生成正确的模型。针对地质体的特点,提出一种三棱柱模型的改进算法,将核心序列优先等方法运用于建模过程,同时运用虚拟钻孔柱的方法处理尖灭,在无需人工干预的情况下较好地实现了对复杂地层倒转现象的模拟。     

网络地图国界自适应显示及符号化方法研究

通过对现有网络地图中国界显示存在的问题进行深入分析,按照网络地图国界显示的基本原则,探讨了网络地图国界自适应显示及符号化的方法。并基于Supermap为中国国界管理信息系统制作了一套国界网络地图。     

海洋里的兔子

海洋里也有兔子，可它与陆地上的兔子不一样，既不会蹦跳，也不会跳跃，而只能在泥沙的海底像蜗牛那样慢慢爬行。在水汪汪的海底，当它静止的时候，头部即伸出一对“搜集情报”用的触角，仿佛陆生兔子的一双耳朵，蜷曲的身体也活像一只趴在地上的兔子，据此特征海洋生物学家们把它定名为“海兔”。     

20世纪80年代以来中国土地利用变化的基本特征与空间格局(英文)

Land-use/land-cover changes(LUCCs) have links to both human and nature interactions. China's Land-Use/cover Datasets(CLUDs) were updated regularly at 5-year intervals from the late 1980s to 2010, with standard procedures based on Landsat TM\ETM+ images. A land-use dynamic regionalization method was proposed to analyze major land-use conversions. The spatiotemporal characteristics, differences, and causes of land-use changes at a national scale were then examined. The main findings are summarized as follows. Land-use changes(LUCs) across China indicated a significant variation in spatial and temporal characteristics in the last 20 years(1990–2010). The area of cropland change decreased in the south and increased in the north, but the total area remained almost unchanged. The reclaimed cropland was shifted from the northeast to the northwest. The built-up lands expanded rapidly, were mainly distributed in the east, and gradually spread out to central and western China. Woodland decreased first, and then increased, but desert area was the opposite. Grassland continued decreasing. Different spatial patterns of LUC in China were found between the late 20th century and the early 21st century. The original 13 LUC zones were replaced by 15 units with changes of boundaries in some zones. The main spatial characteristics of these changes included(1) an accelerated expansion of built-up land in theHuang-Huai-Hai region, the southeastern coastal areas, the midstream area of the Yangtze River, and the Sichuan Basin;(2) shifted land reclamation in the north from northeast China and eastern Inner Mongolia to the oasis agricultural areas in northwest China;(3) continuous transformation from rain-fed farmlands in northeast China to paddy fields; and(4) effectiveness of the "Grain for Green" project in the southern agricultural–pastoral ecotones of Inner Mongolia, the Loess Plateau, and southwestern mountainous areas. In the last two decades, although climate change in the north affected the change in cropland, policy regulation and economic driving forces were still the primary causes of LUC across China. During the first decade of the 21st century, the anthropogenic factors that drove variations in land-use patterns have shifted the emphasis from one-way land development to both development and conservation. The "dynamic regionalization method" was used to analyze changes in the spatial patterns of zoning boundaries, the internal characteristics of zones, and the growth and decrease of units. The results revealed "the pattern of the change process," namely the process of LUC and regional differences in characteristics at different stages. The growth and decrease of zones during this dynamic LUC zoning, variations in unit boundaries, and the characteristics of change intensities between the former and latter decades were examined. The patterns of alternative transformation between the "pattern" and "process" of land use and the causes for changes in different types and different regions of land use were explored.     

基于触发模型的国界电子地图自适应符号设计

运用电子地图显示的理论和方法.从影响国界电子地图显示的因素出发,建立国界电子地图自适应显示的触发模型,并着重研究不同触发模型下国界电子地图符号设计的特点、原则和方法,介绍国界电子地图自适应显示实现机制,以及在国界地理信息系统网络版中的应用.     

面向P2P的分布式矢量地理数据组织及算法研究

P2PGIS是对等计算技术与地理信息系统(GIS)结合的产物.面向P2P的栅格地理数据共享已得到广泛应用,但矢量地理数据与P2P的结合仍然面临诸多难题.本文深入研究了面向P2P的分布武矢量数据索引机制,提出了基于Linking机制的矢量地理数据组织模式、分割及无损拓扑重建算法.实验表明本文提出的分布式矢量数据组织方式和...