基于C#的国家基本比例尺地形图分幅与新旧编号查询实现

根据国家基本比例尺地形图的分幅规则,借助C#实现对已知图幅编号的图幅范围查询,以及对已知坐标点所属图幅在不同比例尺下的新旧编码查询.     

Robust numerical approach to steady-state calibration of mean-value models

A numerically robust approach to steady-state calibration of nonlinear dynamic models is presented. The approach is based on explicit formulation of the constraints on validity of internal model signals by set of inequalities. The constrained optimization with feasible iterates guarantees that the model will never be evaluated with invalid internal signals. This overcomes numerical difficulties often encountered when dealing with highly nonlinear models. Because the approach uses a large number of slack variables, distributed least squares algorithm is proposed. The robustness of this approach is demonstrated on a steady-state calibration of turbocharged diesel engine model starting from grossly inaccurate initial estimates.     

Street level urban design qualities for walkability: Combining 2D and 3D GIS measures

Much of the physical activity and built environment literature has focused on composite walkability indices based on the D variables– design, density, diversity, destination accessibility, and distance to transit. This literature, however, has largely ignored the microscale streetscape features that affect the pedestrian experience. Five street level urban design qualities were recently identified and defined for quantitative measures although these measures are mostly through subjective field observation. View related features such as long sight line and proportion of sky have not yet been objectively measured due to the limitation of data and method. This study uses both 2D and 3D GIS to objectively measure street level urban design qualities in Buffalo, New York and tests their correlation with observed pedestrian counts and Walk Scores. Our results showed that 3D GIS helped to generate objective measures on view related features. These objective measures can help us better understand the influence of street level urban design features on walkability for designing and planning healthy cities.     

城区空间数据索引系统的设计与实现--以北京市为例

针对目前很多GIS系统存在空间数据不能很好的与其他行业的各种属性数据挂接的瓶颈,提出了建立空间数据索引系统的全套方案,通过匹配标准地址将空间数据与大量其他行业的属性数据连接起来,并且实现图形与属性的连接,从而解决了GIS系统属性数据匮乏的问题,并且减少了建立不同GIS应用系统的很多重复工作,使索引系统能够很好的为城市规划、城市建设以及应急指挥提供决策分析依据.     

基于嵌入式的光纤传感检测电路 设计与实现

基于嵌入式ARM和Linux系统设计了光纤温度传感检测电路。利用Linux内核进行嵌入式的驱动程序设计;通过捕捉多个外部中断实现反射谱峰值的间接定位;利用Multisim软件对光纤传感检测电路的外围硬件进行了性能仿真;基于QT设计了嵌入式系统的图形化界面。硬件电路运行结果表明,嵌入式系统的Linux内核可以正常引导和启动,QT图形化界面可以实时显示光纤反射谱峰值以及对应的温度值。和传统的工控开发板相比,该系统对测量结果的显示更加形象直观。     

基于影像匹配数据获取DEM方法探讨

针对地形复杂地区立体像对匹配获取的离散数据,经粗差剔除后分别采用加权平均法、双线性多项式法和移动曲面拟合法等3种内插算法进行构建规则格网DEM的实践,得出移动曲面拟合法特别适用于大范围地形复杂环境的结论。     

平坦地区GPS高程拟合方法精度分析

GPS高程拟合精度依赖于所选择的拟合方法与拟合模型。介绍在平坦地区GPS高程拟合应用的几种拟合模型,以实例验证各种模型的拟合精度,通过精度分析与统计,得出一些有益的结论。     

基于小波变换的遥感数据融合

采用Haar小波方法,对遥感图像进行尝试性的数据融合,实验证明Haar方法和传统的方法相比,具有精度高、效果好的优势。     

精确提取InSAR时间去相关分量的方法

提出了一种干涉合成孔径雷达(InSAR,Synthetic Aperture Radar Interferometry)回波信号时间去相关分析的新方法,该方法主要包括三个步骤:采用自适应区域增长算法(IDAN,Intensity-Driven Adaptive Neighborhood)估计所有干涉子集的相干性;利用迭代最小二乘去除估计量偏差;采用相干性分解技术对无偏样本相干性进行分离,获得精确的时间去相关分量.以美国南加州洛杉矶地区的ENVISAT ASAR数据集为例,对新方法和现有方法进行了比较研究.结果表明,新的融合算法能够获得更加可靠、精度更高的时间去相关分量,并具有非阈值和近乎完全的自适应性.本文的研究将有利于改善与时间相干性有关的地球物理参数反演,也有利于地表变化周期性和随时间变化的气候环境实时监测等.     

北京市某商务居住综合区交通影响评估研究

交通影响评价是对城市土地开发或土地使用性质变更的项目,可能对城市交通所产生的影响进行定量评估并制定解决方案的过程. 近年来,北京市新建商务区以及纯住宅项目较多,新建项目建设完工投入使用后会给周边带来多大的交通量以及是否会恶化原有的交通环境,都需要通过交通影响评价来预决策. 现对北京市某商务居住综合区的交通影响评价进行了研究,提出了交通改善措施.