矢量等高线自动内插加密分析

加密等高线应用在科研生产中的很多领域，在某些工程设计中，其初步设计的图幅也利用了等高线加密技术。以现有通用软件为平台利用已有的矢量等高线自动加密内插新等高线，在内插等高线的过程中，由于点线文件多而杂故首先简化等高线原图，再逐步去掉干扰因素和不合理因素，包括在原图中排除一些干扰因素只裁剪出等高点线和去掉不合理高程点线及图框两个步骤，然后将在最终等高线简化图基础上内插生成的新等高线图与原有等高线图进行了对比分析，为了使比较具有随机性，取每根等高线上头、中、尾三点，量相应追踪生成的新等高线上相应点之间的高差，同一位置量测三次取平均，比较的结果表明矢量等高线自动加密内插的精度可以满足地质编图及填图的要求。

ANALYSIS OF DENSIFYING CONTOUR LINES ON THE BASIS OF AUTOMATICALLY INTERPOLATING IN VECTOR CONTOUR LINES

This article first introduces the importance of studying the technology of densifying contour lines briefly. In fact, the technology of densifying contour lines has been used in many fields of scientific research. And in the same time, during some project designing, the primary designing maps have also been applied in this technology. Then, it describes the automatic densitying contour lines on the platform of the existing common software based on the original contour ones. In the course of densifying contour lines, because of lots of dot and line files, the original figure of contour lines should be simplified at first, and disturbing and unreasonable factors should be removed later step by step. It also compares and analyses the old contour lines and the new contour lines which derive from the old ones with the help of the technology of densifying. In order to make the comparison convincing, the jumping-off point, the midpoint and the end point have been selected and measured respectively for three times. The result of this study shows that this method of interpolating contour lines can meet the precision requirements of geological mapping and compilation.