矢量地理PDF(portable document format)地图具有数据量小、通用性强等特点,是一种具备查询、量算等功能的新型电子地图,其应用需求和前景广阔。单纯利用数字线划图(digital line graphic,DLG)数据,通过符号化和制图编辑等处理制作矢量...矢量地理PDF(portable document format)地图具有数据量小、通用性强等特点,是一种具备查询、量算等功能的新型电子地图,其应用需求和前景广阔。单纯利用数字线划图(digital line graphic,DLG)数据,通过符号化和制图编辑等处理制作矢量地理PDF地图的过程持续时间长,工作量大。充分利用已有的地图制图成果来快速制作矢量地理PDF地图,避免影响已有的制图生产工序流程,对提高矢量地理PDF地图生产效率具有重要意义。提出了一种矢量地理PDF地图制作的方法,利用出版原图(publication originals of map,POM)与DLG数据,通过数据预处理、地图坐标系统构建、数据聚合处理与压缩流程,快速生成矢量地理PDF地图。该方法省略了符号化和制图编辑处理流程,经试验验证,制作矢量地理PDF地图的效率高,成果数据量较POM和DLG数据总量显著压缩,适用于DLG和POM数据源条件具备的矢量地理PDF地图大规模快速生产。展开更多
The stochastic response of a noisy system with non-negative restoring force is investigated. The generalized cell mapping (GCM) method compute the transient and stationary probability density functions (PDFs) real...The stochastic response of a noisy system with non-negative restoring force is investigated. The generalized cell mapping (GCM) method compute the transient and stationary probability density functions (PDFs) real-power is used to Combined with the global properties of the noise-free system, the evolutionary process of the tran- sient PDFs is revealed. The results show that stochastic P-bifurcation occurs when the system parameter varies in the response analysis and the stationary PDF evolves from bimodal to unimodal along the unstable manifold during the bifurcation.展开更多
文摘矢量地理PDF(portable document format)地图具有数据量小、通用性强等特点,是一种具备查询、量算等功能的新型电子地图,其应用需求和前景广阔。单纯利用数字线划图(digital line graphic,DLG)数据,通过符号化和制图编辑等处理制作矢量地理PDF地图的过程持续时间长,工作量大。充分利用已有的地图制图成果来快速制作矢量地理PDF地图,避免影响已有的制图生产工序流程,对提高矢量地理PDF地图生产效率具有重要意义。提出了一种矢量地理PDF地图制作的方法,利用出版原图(publication originals of map,POM)与DLG数据,通过数据预处理、地图坐标系统构建、数据聚合处理与压缩流程,快速生成矢量地理PDF地图。该方法省略了符号化和制图编辑处理流程,经试验验证,制作矢量地理PDF地图的效率高,成果数据量较POM和DLG数据总量显著压缩,适用于DLG和POM数据源条件具备的矢量地理PDF地图大规模快速生产。
基金Project supported by the National Natural Science Foundation of China(Nos.11172233,11302169,11302170,and 11472212)the Fundamental Research Funds for the Central Universities(No.3102014JCQ01079)
文摘The stochastic response of a noisy system with non-negative restoring force is investigated. The generalized cell mapping (GCM) method compute the transient and stationary probability density functions (PDFs) real-power is used to Combined with the global properties of the noise-free system, the evolutionary process of the tran- sient PDFs is revealed. The results show that stochastic P-bifurcation occurs when the system parameter varies in the response analysis and the stationary PDF evolves from bimodal to unimodal along the unstable manifold during the bifurcation.