Length L-function for network-constrained point data     

Zidong Fang  Ci Song  Hua Shu  Jie Chen  Tianyu Liu  Xi Wang  Xiao Chen  Xiaorui Yan  Tao Pei 《Transactions in GIS》2023,27(2):476-493

Network-constrained points are constrained by and distributed on road networks, for example, taxi pick-up and drop-off locations. The aggregation pattern (clustering) of network-constrained points (significantly denser than randomly distributed) along roads may indicate spatial anomalies. For example, detecting and quantifying the aggregation with the highest intensity (i.e., the number of taxi pick-up points per network length) can reveal high taxi demand. The network K-function and its derivative (incremental network K-function) have been utilized to identify point aggregations and measure aggregation scale, yet can only identify radius-based planar-scale results, thereby mis-estimating aggregation patterns owing to the network topology configuration heterogeneity. Specifically, complex road networks (e.g., intersections) may incur aggregations despite their low intensity. This study constructs the length L-function for network-constrained points, using its first derivative to quantify the true-to-life aggregation scale and the local function to extract aggregations. Synthetic and practical data experiments show innovative detection of aggregations at the length-based scale and with high intensity, providing a new approach to point pattern analysis of networks unaffected by topological complexity.  相似文献   

大连临空产业园填海造地工程砂土残余变形试验研究          下载免费PDF全文

赵杰  云高杰  王桂萱 《地震工程学报》2014,36(1):746-752

采用中国地震局工程力学研究所研制的DSZ-Ⅰ型电磁振动三轴仪对大连临空产业园工程场地的土样（浅层砂和深层砂）进行动力特性试验，研究两种砂土在复杂应力状态下的动力残余变形特性。试验结果表明：残余体应变和残余剪应变都随着动应力比和围压的提高而增大，动应力比和围压的影响对残余体应变和残余剪应变的影响规律是一样的；残余体应变随着固结比的提高而减小，而残余剪应变随着固结比的提高而增大,残余体应变的固结比对于试验结果与拟合结果的影响较大，而残余剪应变固结比对于试验结果与拟合结果的影响较小；残余体应变和残余剪应变的Cvr与动应变幅值较好满足线性关系，离散性非常小，而Cdr/S21与动应变幅值关系的离散性则比较大。并给出了地基震陷分析所需的沈珠江模型参数。研究成果可为大连临空产业园填海造地工程抗震设计和地基震陷变形分析提供依据，也可作为其它类似填海造地工程的设计参考。  相似文献   

基于分等定级的海岸带资源价值评估方法研究     

金建君  恽才兴  张淋 《海洋通报》2009,28(3)

海岸带资源价值评估是对海岸带资源进行资产化管理和实施有偿使用制度的前提和关键.海岸带资源的价值受多种因素的影响,不同地区的同一种海岸带资源或同一地区的不同种海岸带资源的质量都有所差异.因此,海岸带资源价值评估应在对其分等定级的基础上进行,这样才能体现海岸带资源质量的优劣和资本收益的差异.在分析海岸带资源价值影响因素的基础上,针对目前海岸带资源价值评估方法的不足,根据生产力理论、区位理论和地租理论提出了基于分等定级的海岸带资源价值评估方法体系,以推进我国海岸带资源资产化管理和有偿使用制度的实施,保证海岸带资源的可持续利用.  相似文献