重大工程数字制图的数据组织方法

数据组织方法对于重大工程的数字制图具有重要意义.根据重大工程中数字制图对数据的要求,重点从工程地质平面图、工程地质剖面图和钻孔柱状图三种图件的数据组织方面探讨了重大工程数字制图的数据组织方法.工程地质平面图主要针对电子地图和用作打印的图件两种功能的数据进行组织,分为空间数据组织和属性数据组织两类.空间数据以图形文件的形式存储,按图幅、比例尺分别存放,其组织模型分空间对象(Object)、图层(Layer)与地图(Map)三个层次;属性数据采用关系数据库来存放,而对属性数据的访问采用开放数据库系统连接(ODBC)来进行.工程地质剖面图数据分为钻孔空间数据和钻孔地层数据.钻孔空间数据以图形文件的形式存储;钻孔地层数据属于属性数据只能保存在关系数据库表格中,通过设置一个钻孔号和钻孔地层数据表的字段将钻孔地层数据和钻孔空间数据关联起来.钻孔柱状图的数据全部是属性数据,只能保存在关系数据库中,分钻孔基本信息表和钻孔地层信息表两个表存放.将以上数据组织方法应用于中国广东省东深供水改造工程的地下环境信息系统开发中,实现了智能化的数字制图功能, 所绘制的图件与勘查报告图件精度一致,但无论从制图效率,还是制图效果均优于一般图件,效果良好.

Data Organization Method for Digital Mapping in a Major Project

Data organization method has an important significance on digital mapping in the construction of major projects. According to the needs of data for digital mapping in major projects,three kinds of data are discussed here based on the maps of engineering geological plane, engineering geological section and drill histogram to discuss the organization methods of digital mapping. Data of geological plane can be divided into two types that are spatial data and property ones. Spatial data are stored as graphic documents according to their sizes and scales, and their organization models are divided into three levels, which are spatial object, map layers and maps;Property data stored by relationship database,and their visiting are realized by the connection of opening database. Data of geological section can be divided into drill spatial data and drill strata data. Drill spatial data are stored as graphic documents; drill strata data belong to property data which can be only stored in relationship database tables; Through by setting up a byte for showing the dill number and its corresponding drill data,the relationship between drill strata data and drill spatial data is established. Data of drill histogram are all property ones; thus, they also only can be stored in the relationship database according to two ways: the one is basic drill information table and the other is drill strata information table. By applying above discussed data organization methods into the development of Underground Environmental Information System (UEIS) of Water Supply Reconstruction Project from Dongjiang to Shenzhen in Guangdong Province, China, the intellectual digital mapping function is realized. The results show that the mapping precision is coincided well with the maps from investigation reports, but no matter what the mapping efficiency or the mapping effect are advantage that of the maps drawing by the general way.