月面形貌的3维可视化算法

基于大范围地形可视化算法研究的基础上,对平面geometry clipmaps算法进行改进,利用GPU的顶点着色器实现平面地形向球面地形的投影变换,并综合利用球面视域裁剪、球面视点控制等技术,使geometry clipmaps算法适用于球面海量地形数据的3维可视化;收集处理月球全球影像和形貌高程数据,对算法进行验证,实现月球表面形貌的实时动态3维可视化.试验表明:绘制算法可不受数据量大小的限制、绘制效率高、效果逼真,但存在两极变形较大的缺点.

Abstract：

Based on the study of visualization arithmetic of large area terrain, plane geometry clipmaps algorithm is improved. Projection transformation from plane landform to sphere landform was realized by using GPU vertex shader. In that improved algorithm, methods such as sphere vision field culling and sphere viewpoint control are used.That makes geometry clipmops algorithm more effective in 3D visualization of massive sphere terrain data. The whole moon image and DEM data are collected and disposed, which are used to verify the capability of that algorithm, realizing dynamic and real time 3D visualization of moon surface. The experiments show that the graphic algorithm isn't limited by data quantity, which is of high efficiency and reality simulation, but the two-pole distortion is serious.     

OGC CSW规范实现探讨

OGC CSW规范的实现,主要包括元数据信息模型建立、属性项映射、结果编码格式定义和软件实现,实现过程中需要注意参数格式标准化、参数约束条件、参数变化、元数据信息模型、名称空间以及该规范的局限性。介绍OGC CSW规范与目录服务标准及相关规范的关系,回顾该规范实现情况,结合全国测绘成果目录服务系统研发建立的工作实践,对OGC CSW规范的实现步骤和需要注意的问题进行讨论,并以全国测绘成果目录服务系统为例,介绍OGC CSW规范的应用效果。     

基于最小信息量准则的小波变换确定变形监测精度

提出了应用最小信息量准则,提取了原始数据中的噪声信息并完整地保留变形信号,准确地估算了实际监测精度。     

SPOT5与ERS-2卫星影像的联合立体定位

本文将SPOT5与ERS-2卫星影像联立构成一组立体像对,并通过立体定位的方式获取了地面点的三维坐标。根据本文立体像对前方交会的特殊几何图形,推导了立体定位理论精度的计算公式,并利用实验验证了公式的正确性,同时分析了影响立体定位精度的主要因素。实验结果表明,联合具有一定重叠度的SPOT5和ERS-2影像进行立体定位具有很强的可行性,其精度已可以满足部分测绘任务的要求。     

GISVlog模型的设计与实现

本文以地理信息系统(GIS为基础,分析了地理信息系统沃客(GISVlog,)形成的两个背景——网络新技术提高GIS生命力和沃客(Vlog,Vedio log的缩写)为网络增值;分别论述了GISVlog形成对GIS发展和Vlog发展的意义;在普通GIS的系统功能结构和Vlog的系统功能结构的基础上构建GISVlog的框架结构并加以实现;论文最后展望了GISVlog的发展前景,提出GISVlog是网络搜索技术新的研究方向。     

基于GIS的物流配送中心选址模型研究

配送中心是物流网络中的重要节点,对于优化企业物流系统,合理配置库存资源,提高物流的共同化程度发挥着重要作用。本文应用G IS网络分析方法和改进P中心选址算法,建立了配送中心选址优化模型。该模型由几何网络确定配送中心与需求点间距离、并引入租金、坡度、库存量等因素参与模型计算,通过总费用最小化确定仓库的最佳位置。因采用多因素参与决策和算法的改进,提高了配送中心选址精度,降低了用户选择的盲目性。     

三维城市模型的研究与实践(英文)

The way we interact with spatial data has been changed from 2D map to 3D Virtual Geographic Environment (VGE). Three-dimensional representations of geographic information on a computer are known as VGE, and in particular 3D city models provide an efficient way to integrate massive, heterogenous geospatial information and georeferenced information in urban areas. 3D city modeling (3DCM) is an active research and practice topic in distinct application areas. This paper introduces different modeling paradigms employed in 3D GIS, virtual environment, and AEC/FM. Up-to-date 3DCM technologies are evolving into a data integration and collaborative approach to represent the full spatial coverage of a city, to model both aboveground and underground, outdoor and indoor environments including man-made objects and natural features with 3D geometry, appearance, topology and semantics. Supported by the National Natural Science Foundation of China ( No. 40871212, No. 40671158), the Leading Academic Discipline Project of Shanghai Educational Committee( No.J50104).     

Study on transmission mechanism of thermal infrared remote sensing for abrupt geothermal anomaly in volcanic region

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Landscape ecological construction and biodiversity protection

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广西军事体育学校膨胀岩山体滑坡整治的反思

膨胀岩（土）病害是一种特殊的工程地质现象。文章通过对广西军体校膨胀岩山体滑坡的整治经验进行总结,探讨其成因机理,提出对整治设计的一些看法