Level Curves - 1:10.000 (Digital) - 1988 Edition

They are level curves digitized by the regional technical map in 1:10000 scale. They cover a portion of the region equal to about 350 CTR sections, corresponding to the mountain part, for an extension of about 14700 sq km.They are detected every 50 meters of altitude starting from 50 meters above sea level and digitized with incremental method (one point every mm on paper).本数据集为基于1:10000比例尺区域技术地图数字化得到的等高线（level curves）。其覆盖区域对应350个CTR分区的山地片区，总面积约14700平方千米。该数据集以海拔50米为起始高程，以每50米为间隔采集高程数据，并采用增量式数字化方法完成数字化流程，即在纸质原图上每毫米采集一个点位。