多边形图形矢栅混合模型的改进及编码方法

Improvement of Polygonal Graphics Vector- Raster Mixed Model and Coding Method

矢栅混合模型在GIS和制图中得到广泛的应用,但该模型中矢量数据和栅格数据不做任何处理被分别存储一个空间数据库中,数据重复存储占用了大量存储空间,为此提出了一个改进方法,该方法是基于多边形图形矢量数据和栅格数据自身编码的特点,将两者转换成同样的Morton码,这样就在很大程度上避免了数据的重复存储,减少了存储空间,同时采用编码树的原理,保证了编码转换时的唯一性。

Vector- raster mixed model is widely used in GIS and graphics, but the model of vector data and raster data without any treatment were stored in a spatial database, data redundancy storage occupies large storage space, o this paper presented a modified method. The method is characteristic of polygon graphics vector data and raster data can be based on transformation, both into the same Morton code, it largly avoids the repeated storing data, reduce the storage space.