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本文介绍了目前GIS领域的通用交流语言——地理标记语言GML，该语言对实现地理空间数据的网上共享具有很重要的作用。本文采用GML来实现Mobile GIS多源数据的统一表达，提出了“有线下载，无线服务”模式下基于SVG的GML可视化策略，并给出了进一步优化方案。由于SVG在矢量图形表达方面所具有的种种优势，使基于SVG的解决方案具有很好的应用前景。 相似文献
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遥感信息处理不确定性的可视化表达 总被引：2，自引：0，他引：2
如何全面、准确地度量和可视化表达遥感信息处理中不确定性的程度和空间分布方式,是遥感信息不确定性研究的关键问题之一.传统的度量方法(例如误差矩阵)是将以训练样本集为基础的度量作为总分类精度的度量,而我们需要估计模型对于"样本外数据"的性能.本文首先利用信息论和粗糙集理论等度量遥感分类影像属性信息的不确定性,提出基于像元、目标和影像的遥感信息不确定性度量指标;然后分别描述了基于不同度量指标的可视化表达方式,并对我国黄河三角洲地区的Landsat TM影像进行了分类信息不确定性度量和可视化表达实验. 相似文献
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《地球科学进展》2017,32(9):996-1005
Various three-dimensional (3D) geophysical and geological data are increasingly available with the advanced technology in the recent years. New challenges emerge frequently in visualizing 3D data due to data variety and the specific display requirement. In this study, we presented a solution of the data assimilation and visualization of lithospheric structures in the eastern margin of the Tibetan Plateau. Three typical datasets were assimilated in the model: ①seismic velocity to the depth of 100 km, ②fault geometry in the upper-and mid-crust and ③topographical data on the surface. The S and P wave velocities in the study area obtained from a high-density portable seismic array were interpolated into regular blocks of the size of 1 km×1 km×2 km and written in RAW format. The major active faults were digitalized and their 3D geometry was generalized by using striking and trending angles, and then organized into unstructured VTK format. The surface topographical DEM data were also converted into unstructured VTK format. In order to integrate and visualize the data, an open source multi-platform software package Paraview was used. It offered various visualization schemes; in particular, volume rendering technique provided stunning static/dynamic images of the structures and highlighted the anomalies in the 3D space. This solution can be applied to other types of 3D geophysical and geological data. 相似文献
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Visualizing complex pore structure and fluid flow in porous media using 3D printing technology and LBM simulation 
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下载免费PDF全文 Pore structures of porous media and properties of fluid flow are key factors for the study of non-Darcy groundwater flow. However, it is difficult to directly observe pore structures and flow properties, resulting in a “black box” problem of porous media. This problem has hindered the in-depth study of the groundwater flow mechanism at the pore scale. In recent years, 3D rapid prototyping technology has seen tremendous development. 3D printing provides digital models and printing models of porous media with clear internal structure. Thus, Lattice Boltzmann Method can be used to simulate the flow processes at the pore scale based on real pore structures. In this study, 3D printing cores and Lattice Boltzmann Method were coupled to conduct both laboratory and numerical experiments in spherical porous media with different sphere diameters and periodic arrays. The LBM simulation results show a good agreement with laboratory experimental results. With the advantages of LBM and 3D printing, this approach provides a visualization of the complex pore structure and fluid flow in pores, which is a promising method for studies of non-Darcy groundwater flow at the pore scale. 相似文献
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