摘要(Abstract)
MapInfo是美国MapInfo公司的桌面地理信息系统软件,是一种数据可视化、信息地图化的桌面解决方案。它依据地图及其应用的概念、采用办公自动化的操作、集成多种数据库数据、融合计算机地图方法、使用地理数据库技术、加入了地理信息系统分析功能,形成了极具实用价值的、可以为各行各业所用的大众化小型软件系统。MapInfo 含义是“Mapping + Information(地图+信息)”即:地图对象+属性数据。MapInfo是个功能强大,操作简便的桌面地图信息系统,它具有图形的输入与编辑、图形的查询与显示、数据库操作、空间分析和图形的输出等基本操作。系统采用菜单驱动图形用户界面的方式,为用户提供了5种工具条(主工具条、绘图工具条、常用工具条、ODBC工具条和MapBasic工具条)。用户通过菜单条上的命令或工具条上的铵钮进入到对话状态。系统提供的查看表窗口为:地图窗口、浏览窗口、统计窗口,及帮助输出设计的布局窗口,并可将输出结果方便地输出到打印机或绘图仪。MapInfo的表操作命令(除查询外)都集中放在菜单项“表”中,主要包括:
⑴建立新表、添加、修改、显示、删除数据记录;
⑵更新列命令 用于快速且可视化地更新表。先选择对象,在菜单上选择表->;更新列,填写更新列的对话框。
⑶聚合数据 MapInfo中提供了许多功能强大的聚合函数,用来派生新的信息。聚合函数包括:
Average 计算平均值;
Count 计算一组中记录的个数;
Minimum 查找一组中所有记录的最小值;
Maximum 查找
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