空间数据的栅格与矢量自适应可视化表达研究

Research on raster and vector adaptive visual expression of spatial data

为优化WEBGIS中空间数据的可视化表达效率,对栅格图片和矢量文本两种表达方式进行实验比较,文中提出矢量文本表达方式的结果数据量大小最终需要取决于用于描述空间数据的顶点信息量之和,因此不具有普适性,同时证明当顶点信息量之和在一定范围内时其效率又要优于栅格表达方式,在此基础上提出空间信息的栅格与矢量自适应数据表达模式。实验表明,该模式确实很好地提高了空间数据表达效率。

In order to optimize the visual data expression efficiency of spatial data in WebGIS, two expressions of raster images and vector are compared, resulting that the data flow of the vector text expression ultimately depends on the sum of vertex information. Therefore, it proves to be not universal, and the vector way is better than raster expression when total sum is within a certain range. A raster and vector adaptive expression pattern is provided. Experiments show that the pattern can improve the efficiency of spatial data expression.