四川天全、芦山、宝兴地区名山组地层特征

下第三系名山组广泛分布于天全-芦山复向斜内,地层出露良好。笔者(1989—1991年)在参加1:5万天全幅、灵关幅区域地质调查时,根据岩组图填图要求,又进一步展开了对名山组的研究。本文简要地介绍了新实测的地层剖面,以及重新将名山组划分为4个段和新建大溪砾岩等填图单元的情况;并阐述了将芦山组归并于名山组上部(4段)而取消该组名称的依据。综述了研究区的岩石组合特征、沉积构造,建立了地层层序。将名山组沉积环境解释为辫状河及湖泊环境。     

农业系统地图在区域经济布局及规划中的应用

本文探讨了利用农业系统地图直接对区域经济布局及发展作出规划与预测,并将分析和解译地图的结果直接用于指导生产实践的可行性。结果表明,地图就是客观实际的科学模拟,可以揭示出自然与经济、经济系统内部的规律,是研究农业生产合理的规划和布局,发展区域经济和科学预测的极为有效的科学工具。     

1950-1980年中国地区主磁场模型的建立及分析

本文根据丰富的地磁资料,用泰勒多项式方法推算出1950.0、1960.0、1970.0和1980.0年中国地区的主磁场模型,绘制出各个年代地磁要素的等值线图,分析研究了局部地区地磁场泰勒多项式模型的特点.     

试论地图制图学的理论体系

本文针对当前国内外有关地图制图学理论问题的阐述,提出地图投影、制图综合和地图符号系统是地图制图学的基础理论;而信息理论等新兴学科的应用是地图制图学的应用理论。在此基础上提出了地图制图学分支学科的划分问题。     

基于NewMap在线专题地图制作

随着数字城市地理信息公共平台的投入运行,共享的在线专题信息越来越多,专题制图的需求越来越多。为增强专题地图的适用性、交互性和灵活性,以专题制图方法和网络服务为技术指导,以网络专题制图为研究对象,基于NewMap将传统的专题制图流程与Web服务相结合,形成一个面向服务的在线专题制图系统。     

基于离线卫星地图的移动导航定位服务应用

为实现精准的移动导航定位,将离线地图导航软件与web墨卡托投影格式影像图、DEM数据、OSM矢量交通图等数据相结合,借助离线地图导航软件的定位功能以及地形地貌、植被类型、通行通视条件等特征信息进行移动导航定位的现场解译,同时总结了移动导航定位在广西某输电线路和老挝某钾盐矿项目勘测中的导航应用效果。结果表明,基于离线卫星地图的移动导航定位既可以帮助野外工作人员宏观把握整体导航路线,又能通过现场解译对临场细节进行验证,从而优化导航线路顺利到达待测点位置。     

Conceptual hydrodynamic-thermal mapping modelling for coral reefs at south Singapore sea

Coral reefs are important ecosystems that not only provide shelter and breeding ground for many marine species, but can also control of carbon dioxide level in ocean and act as coastal protection mechanism. Reduction of coral reefs at Singapore coastal waters (SCW) region remains as an important study to identify the environmental impact from its busy industrial activities especially at the surrounding of Jurong Island in the south. This kind of study at SCW was often being related to issues such as turbidity, sedimentation, pollutant transport (from industry activities) effects in literatures, but seldom investigated from the thermal change aspect. In this paper, a computational model was constructed using the Delft3D hydrodynamic module to produce wave simulations on sea regions surrounding Singapore Island. The complicated semi-diurnal and diurnal tidal wave events experienced by SCW were simulated for 2 weeks duration and compared to the Admiralty measured data. To simulate the thermal mapping at the south Singapore coastal waters (SSCW) region, we first adapted a conversion of industrial to thermal discharge; then from the discharge affected area a thermal map was further computed to compare with the measured coral map. The outcomes show that the proposed novel thermal modelling approach has quite precisely simulated the coral map at SSCW, with the condition that the near-field thermal sources are considered (with the coverage area in the limit of 20 km × 20 km).     

基于地理国情普查数据的空间规划底图编制研究

空间规划底图编制是创新性地编制好市县经济社会发展总体规划、实施主体功能区制度、推动市县"多规合一"的重要基础。本文基于地理国情普查数据,开展空间规划底图编制生产性实验,对生产及技术环节提出指导意见,分析相关问题产生的原因,总结经验。     

Real-time raster projection for web maps

The virtual globe is the default visualization for Digital Earth applications, but it can only show one half of the Earth. This article introduces user-adjustable, on-the-fly projection of georeferenced raster images for web mapping and web GIS applications. This technique allows users to center a map on arbitrary locations, while still seeing the entire Earth surface. Modern web mapping libraries can apply map projection transformations to vector data in the browser, but they do not currently support the projection of raster images at interactive frame rates. We use the cross-platform WebGL (Web Graphics Library) graphics pipeline for hardware-accelerated projection of raster data in web browsers. Two algorithmic techniques – inverse per-fragment projection, and combined forward per-triangle and inverse per-fragment projection – for georeferenced raster imagery are documented. The resulting raster maps combine the ease of use and flexibility of interactive virtual globes with the ability to show the entire Earth. The adjustable projection of raster imagery allows users to observe global phenomena that are difficult to visualize on virtual globes or traditional maps with static projections.