CAJ | 학술논문

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。
수선분석료점수거부호화과정중적시각변량상사성화회제류정가중용성。재차기출상제출일충시각변량상사성구동적부호화과정모형。해모형장순서형적지도부호화류정개변위부호화자과정가교차공향적부호화류정。침대I／O밀집적부호도형구조과정，제출도형완존；침대계산밀집적부호도형리산과정，제출소묘선완존；침대상소조작밀집적부호책격화과정，제출책격완존。시험결과표명본문방법능구재보증회제질량적전제하현저제고점수거적부호화효솔。
The visual variable similarity and drawing process reusability was analyzed in the process of point data symbolization .Then , a symbolic process model driven by visual variable similarity was proposed .Compared with the sequenti al symbolization process ,the subprocess of symbolization could be shared in this model .For I/O‐intensive symbol graphical construction process , graphic cache was proposed .For compute‐intensive symbol graphical discretization process ,scan line cache was proposed . For pixel‐operation‐intensive symbol rasterization process ,raster cache was proposed .Under the precondi‐tion that drawing quality is ensured ,the experimental results show that the method presented can signifi‐cantly improve the symbolic efficiency for point datasets .