【摘 要】
：
The concept of ‘Beautiful China is a new goal of ecological construction in the new era of socialism and aims to meet the needs of people as they strive for a better life. National land spatial planni
【出 处】
：
Journal of Geographical Sciences
论文部分内容阅读
The concept of ‘Beautiful China is a new goal of ecological construction in the new era of socialism and aims to meet the needs of people as they strive for a better life. National land spatial planning is one major component of the Chinese states ov
其他文献
大型水工建筑物和城市地下轨道是国家的重要基础设施,人工变形监测耗时费力,利用激光雷达扫描对其进行自动化的变形监测已成为研究热点。而此类建筑物具有较多的平面结构特征,为了高效去除平面结构扫描点云中的噪声点,本文提出了一种融合主成分分析和局部邻域的噪声剔除方法,首先利用主成分分析剔除全局噪声,然后利用局部邻域对局部小噪声进行剔除,结合实例对该方法进行了验证。应用结果表明,该方法效率高、算法简单可行,具
三维激光扫描技术具有不接触、高密度、高精度和数字化等特点,可实现地铁隧道全息、全面、快速三维测量。在土建施工阶段,分别对隧道初支及二衬进行三维扫描,可快速获取初支断面的超欠挖情况及二衬限界情况;将初支与二衬扫描获取的点云进行叠加计算,可分析隧道施工二衬的厚度。在地铁隧道运营阶段,采用移动三维激光扫描技术对隧道进行扫描,可快速获取隧道的全息数据,从点云中可分析、提取隧道渗水、裂缝、管片错台等病害信息
针对现有算法难以精确配准重叠区域较小的点云,提出一种结合二维序列图像的点云初始配准方法。基于移动式三维测量方法获取实物表面灰度图像及三维数据,根据透视投影原理对相机在点云局部坐标系中的位置进行定位,获取点云到对应相机坐标系的变换矩阵,并以灰度图像的特征点及其匹配点作为匹配对,通过重建序列图像对相机外参数予以全局优化,根据初始配准公式实现点云初始配准。试验结果表明,该算法可正确配准重叠区域较小的点云
针对常规浊度测量方法受背景光影响大的问题,采用了数字锁相放大原理与常规浊度测量相结合的方法对微弱光电信号进行处理。采用数字正交锁相放大技术提取待检测信号的幅值与相位,消除了信号延迟及环境背景光的影响,有效提升该系统检测精度、范围及被检测信号信噪比。通过对系统进行优化,实现了浊度检测仪器的微型化和低成本化。利用所研制微型浊度检测仪器的实际测试实验表明,总体检测精度为±3%FS,测量范围为0～2 00
The compilation of 1:250,000 vegetation type map in the North-South transitional zone and 1:50,000 vegetation type maps in typical mountainous areas is one of the main tasks of Integrated Scientific I
With the degradation of natural resources and environment caused by industrial development in some developing countries, the requirement of implementing a "social ecological" approach to development i
Urbanization and eco-environment coupling is a research hotspot. Dynamic simulation of urbanization and eco-environment coupling needs to be improved because the processes of coupling are complex and
Saltwater intrusion in the estuary area threatens the use of freshwater resources. If river discharge increases to a critical value, then saltwater intrusion frequency and salinity level decreases. In
Extreme weather is an important noise factor in affecting dynamic access to river morphology information. The response characteristics of river channel on climate disturbances draw us to develop a met