METHODS FOR THE PRODUCTION OF FIELD FREE-HAND MAPS AND GEOGRAPHIC BASEMAPS IN DIGITAL GEOLOGICAL MAPPING
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摘要: 数字填图系统实现了区域地质调查从野外数据采集、数据处理、成果输出等全流程信息化，准确、快速地制作符合相关精度要求的野外手图地理底图是保证野外调查工作质量重要基础环节。通过1：5万区域地质调查实际工作，提出了地形数据坐标系转换流程，总结了一套简捷实用并符合相关精度要求的区域地质调查野外地质手图地理底图的制作方法：第一步使用Mapgis67投影变换模块中的"工作区直接投影转换"功能将1：5万比例尺的地形图数据放大，第二步运用Section插件对放大到1：2.5万的矢量地形数据进行裁剪，第三步根据最新遥感影像等资料添加最新的地形地物从而实现地理底图的图面整饰。Abstract: Digital mapping system realizes the informatization in the whole process of regional geological survey from field data acquisition, data processing to result output and so on. Accurate and rapid production of field free-hand maps and basemaps is the foundation of field investigation work. According to the 1:50000 scale regional geological survey, the transformation process of terrain data coordinate system is presented and a set of methods for the rapid production of field free-hand maps and basemaps that meet the relevant accuracy requirements are summarized.The first step is using the "workspace direct projection transformation" function in the projection transformation module of Mapgis 67 to enlarge the 1:50000 scale data. The second step is cutting out the enlarged 1:25000 scale terrain vector data with the Section widget.The third step is adding the latest terrain and surface features according to the remote-sensing image data to achieve the final drawing of geographic basemaps.
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图 1 Mapgis67软件中设置好2000国家大地坐标系的效果图
Figure 1. Renderings of 2000 National Geodetic coordinate system setted in Mapgis 67
表 1 2000国家大地坐标系相关参数
Table 1. The related parameters of 2000 national geodetic coordinate system
长半轴 扁率 地心引力常数 自转角速度 a=6378137 m f=1/298.257222101 GM=3.986004418×1014 m3/s2 ω=7.292115×10-5 rad/s 
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