CAJ | 학술논문

针对高程格网数据的海量性，以增强数据可读性和提高绘图效率为目的，对传统绘制等高线过程进行优化。实验将绘制等高线图分为3大步：数据预处理、建立高度索引、根据索引绘图。首先，采集和简单处理原始DEM （数字高程模型）数据，提取数据中与绘图相关的核心信息，如整幅地图中左上端点和右下端点的经纬度，最大高度和最小高度等。其次，在数据预处理后的基础上，再次解剖数据，即通过等值点判断、等值点线性内插和等值点追踪生成可读性强的高度索引文件。最后，根据建立好的高度索引数据来构建数据结构，合理储存信息，利于计算机快速绘制等高线图。
침대고정격망수거적해량성，이증강수거가독성화제고회도효솔위목적，대전통회제등고선과정진행우화。실험장회제등고선도분위3대보：수거예처리、건립고도색인、근거색인회도。수선，채집화간단처리원시DEM （수자고정모형）수거，제취수거중여회도상관적핵심신식，여정폭지도중좌상단점화우하단점적경위도，최대고도화최소고도등。기차，재수거예처리후적기출상，재차해부수거，즉통과등치점판단、등치점선성내삽화등치점추종생성가독성강적고도색인문건。최후，근거건립호적고도색인수거래구건수거결구，합리저존신식，리우계산궤쾌속회제등고선도。
According to the large amount of DEM data , in order to enhance the data readability and improve drawing efficiency , we optimized the traditional process of drawing the contour lines .The entire process was divided into three operations:Data pre-processing , building height index , mapping in accordance with the index .First of all , by collecting and simply processing the o-riginal DEM (digital elevation model) data, we extracted the key information related to mapping in the data , such as the latitude, longitude, maximum height and minimum height of the endpoints left-up and right-down in the whole map.Secondly, based on data preprocessing , we analyzed the data again through the equivalent point judging , the equivalent point linear interpolation and the equivalent point tracking to establish the strongly readable index files of height .At last, according to the height index data , the data structure was constructed to reasonably store data , so it could help the computer fast drawing contour map .