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测绘学报  2014 

一种视觉变量相似性驱动的点数据符号化过程模型

DOI: 10.13485/j.cnki.11-2089.2014.0185, PP. 1274-1279

Keywords: 视觉变量,相似性,地图符号,符号化,过程模型

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Abstract:

首先分析了点数据符号化过程中的视觉变量相似性和绘制流程可重用性.在此基础上提出一种视觉变量相似性驱动的符号化过程模型.该模型将顺序型的地图符号化流程改变为符号化子过程可交叉共享的符号化流程.针对I/O密集的符号图形构造过程,提出图形缓存;针对计算密集的符号图形离散过程,提出扫描线缓存;针对像素操作密集的符号栅格化过程,提出栅格缓存.试验结果表明本文方法能够在保证绘制质量的前提下显著提高点数据的符号化效率.

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